fuel pressure, please help, cpi?

I have a 94 Jimmy with the 4.3L vortec CPI and it is showing most of the signs of the CPI unit leaking. I really do not want to replace it though unless it absolutely needs it because I can not do the work myself as I am not that familiar with that kind of work, can not handle the summer heat and have no one to do it for me, and the cheapest shop I found is $500(including labor). I can have the fuel pressure tested for $65, if I am correct wouldnt that so whether it is most likely leaking or not, as if it is leaking, the fuel pressure would be lower than it should be? Or would I be better off to just go ahead and have it repaired, since they do have a tendency to go bad? Keep in mind it is a 94 with a 164xxx miles, I have only owned it several months and am not sure what all has been done to it, that I have had the entire fuel system, including egr valve cleaned, the fuel filter, air filter, pcv valve, spark plugs, spark plug wires, distrubutor cap, and ignition rotor repaired.

You can test the pressure yourself rather easily. Go to autzone and get a fuel pressure tester from their loan-a-tool. It will end up being free.

Attach the fuel pressure gauge to the shrader valve on the back of the intake (looks like a bicycle tire valve only a little thicker).

Turn the ignition to the run position for 10 seconds, then turn it off. The gauge should read 56-60. It should hold at that for at least 15 mins. If the gauge starts falling rapidly or doesn't achieve that pressure then you have a leaking CPI or nut kit.

Now. If you have a cheapie socket wrench set you have the tools to change the CPI by yourself. It's actually quite simple.

I decided I would just take off the vortec cover, and use a flashlight to look down through the IMTV, and to my suprise the CPI & Nut Kit was leaking. Also I agree with Blazer LT in one the other posts, you need to stop telling people to take off the upper plenum as it is not needed, because with a flashlight you can easily see through the IMTV.

P.S. ANYONE READING THIS NEEDS TO BE AWARE OF THE FACT THAT YOU DO NOT NEED TO TAKE THE ENTIRE UPPER PLENUM OFF TO SEE THAT THE NUT KIT OR CPI EITHER ONE IS LEAKING. JUST USE A FLASHLIGHT TO LOOK DOWN THROUGH THE IMTV, IN WHICH I AM SURE EVERYONE OWNS A FLASHLIGHT.

And as I've said time and time again, you can't always see everything through the imtv...This has been proven time and time again. So I'll keep reccomending it. You have your opinion, I have mine.

Well I just got my Jimmy back from the shop today. Had the CPI and Nut Kit, and had my oil changed, ended up costing $525 total. It took care of the missing, took care of my rough idle, the gas smell, and the surging when accelerating at low speeds. It still has like a rattle noise when accelerating at low speeds(which I believe has to do with the catalytic convertor because appearantly the CPI has been leaking for the past several months while I was driving the vehicle, and who knows how long before I bought it). However atleast it is to where I can drive it decently and I am not wasting 1/4 tank of gas in 25 miles of driving because at the end when I took it to the shop I went through 1/4 tank of gas(5gallons) in about 25 miles, along with it was missing so bad I couldnt even accelerate really and was stuck to keep it under 25mph. Hopefully my problems are taken care of now. Figured I would repost to let everyone know I did take care of my problems, atleast for now. IF ANYONE DOES HAVE ANY OTHER IDEAS WHAT COULD BE CAUSING RATTLE NOISE FROM MY EXHAUST(SOUNDS KINDA LIKE THE HEAT SHEILD IN THE MOTOR LOOSE OR CRACKED, EVEN THOUGH THAT AINT IT AND ITS COMING FROM RIGHT AT THE CATALYTIC CONVERTOR) PLEASE POST IT FOR I CAN CHECK IT OUT OR LOOK IN TO IT.

Well considering you've been dumping so much fuel, probably your cat is breaking up.

Thanks for your reply on that. Thats what I was figuring to is the cats probably bad from the fuel dumping like it was. Do you know if there is anyway to actually find out if the cat is bad without costing a shit load of money, or replacing it? Obviously I cant really afford to replace parts unless I am 100% positive it needs it.

Stop by a local muffler shop... The can test it for ya. Usually at no charge.

Aight, I wasnt sure if a an exhaust shop could test cats or not, because I wasnt sure if there was a way to even test them, but thanks for the info, and I'll look in to that and post any results for anyone that reads the thread will know what the outcome in in case they have the same probs.

[QUOTE=rlith]You can test the pressure yourself rather easily. Go to autzone and get a fuel pressure tester from their loan-a-tool. It will end up being free.

FYI - I tried to borrow a fuel pressure tester from Autozone and they don't have them around here. Even their website doesn't show them available.

http://autozone.com/in_our_stores/loan_a_tool/loan_a_tool.htm

Good luck!

You can test the pressure yourself rather easily. Go to autzone and get a fuel pressure tester from their loan-a-tool. It will end up being free.

FYI - I tried to borrow a fuel pressure tester from Autozone and they don't have them around here. Even their website doesn't show them available.

http://autozone.com/in_our_stores/loan_a_tool/loan_a_tool.htm

Good luck!
I've heard a lot of people say that. I don't think I've seen anyone get one, yet.

Aight, I wasnt sure if a an exhaust shop could test cats or not, because I wasnt sure if there was a way to even test them, but thanks for the info, and I'll look in to that and post any results for anyone that reads the thread will know what the outcome in in case they have the same probs.

Alright, I finally got around to going to an exhaust shop and having my exhaust system looked it. It is truly indeed my catalytic converter thats broke up on the inside from all the fuel dumping through. My muffler is also beginning to show signs of replacement, so since I want custom exhaust anyway I am just going to go ahead and have the cat replaced with a highflow cat and have the muffler replaced with a flowmaster 40 series single inlet and dual outlet with stainless steel tips. Just figured I would let everyone know of what the rattling noise turned out to be.

Don't get a flow40, install a Ravin Z55.

Trust me, you will love it.

Don't get a flow40, install a Ravin Z55.

Trust me, you will love it.

You may personally like Ravin Z55, but 3 of my friends have Flowmaster 40's, and one of them actually have them installed on a 92 Blazer. Personally I like the sound of them, and have heard nothing but good things from them as far as friends, so I'm just going to go ahead and go for the flowmaster.

You may personally like Ravin Z55, but 3 of my friends have Flowmaster 40's, and one of them actually have them installed on a 92 Blazer. Personally I like the sound of them, and have heard nothing but good things from them as far as friends, so I'm just going to go ahead and go for the flowmaster.

Sure, do what you want, but a Flow40 flows almost worse than the stock muffler so don't expect a performance gain from it.

http://memimage.cardomain.net/member_images/3/web/519000-519999/519698_5_full.jpg

The Ravin has a straight through flow design that doesn't hinder exhaust flow whereas the Flow40 has deflectors and dividers throughout causing foor exhaust flow.

Flow40 will give you sound whereas Ravin will give you sound plus performance.

Listen to the sound clips of mine here:

At the bottom of the page...

http://www.cardomain.com/ride/519698/2

The Z55 I have installed is not even the loudest option from Ravin either. There is a Z33.

I have flow40's on a 4.3L right next to my truck and everyone could hear the difference and hands down liked the Ravin better.

Be different and be smart, getting something because all your friends have it when you have data showing you a better option would be your choice, but not the best one you could make.

Well I have actually checked in with the State of Illinois Emission Testing, along with several licensed exhaust shops in the area, and from every source I have been told, and shown examples to where people with Ravin mufflers have yet to pass emission testing in the state of IL. So yes they may provide better performance, but are illegal in the state of IL do to not being able to pass emissions, so it would be pointless for me to put a Ravin on my Jimmy, as I wouldnt be able to drive it legally. Matter of fact, I have yet to find anyone in the state of Illinois to even sell Ravin, as they do not confirm with our state emission requirements.

Well I have actually checked in with the State of Illinois Emission Testing, along with several licensed exhaust shops in the area, and from every source I have been told, and shown examples to where people with Ravin mufflers have yet to pass emission testing in the state of IL. So yes they may provide better performance, but are illegal in the state of IL do to not being able to pass emissions, so it would be pointless for me to put a Ravin on my Jimmy, as I wouldnt be able to drive it legally. Matter of fact, I have yet to find anyone in the state of Illinois to even sell Ravin, as they do not confirm with our state emission requirements.

What the heck does a free flowing muffler have anything to do with emmissions? It has no bearing on emmissions but just to entertain your weird reason for not installing a Ravin muffler, I offer you my emmissions testing I just had on my 1995 Blazer with a CPI 4.3L with over 137,000miles on the odometer.

Here they are:

http://www.automotiveforums.com/vbulletin/showthread.php?t=397962&highlight=emmissions

Hydrocarbons:

Acceptable Limit: 165
My reading: 16

Carbon Monoxide:

Acceptable Limit: 1.00%
My Reading: 0.007%

You really have to stop taking the bullshit people are feeding you as gospel.

A muffler has no bearing on your engine emmissions results. The last thing in the exhaust line that has any influence is the O2 sensor after the cat convertor but you don't even have that on your truck, you only have one before the cat.

I honestly think you are just making things up for some reason because if you said what you said in a REAL muffler shop, they would laugh you out of the reception.

Honestly, stop making shit up.

I don't see "muffler" listed as a cause of failing an emisssions test:
http://www.mattsauto.com/h.htm

I don't see "muffler" listed as a cause of failing an emisssions test:
http://www.mattsauto.com/h.htm

I can not say what the emission regulations are in Canada or in the state of Florida, or any other state as far as that is concerned. Simple fact is, EVERY state has different laws and regulations on Emissions, or any thing else on automobiles. I am assuming now that one of you work with the state of IL on their emissions, and therefore know that they arent Illegal? Illinois have laws against a lot of shit, and it is beyond my control and is a FACT that I have no control over what they state of Illinois says on emissions, whether I agree with it or not. Maybe in Florida, or Canada they are legal and have control on passing emissions, however in Illinois they will cause a vehicle not to pass emissions. If what you are saying on that muffler has no affect on emissions, than it would be a fact that mufflers are not required by law. However in Illinois, mufflers are required for emissions(you can't straight pipe it from cat back) and pass. Hell in Illinois from 1996 and up vehicles they dont even do conventional testing, they just test the OBD II computer and goes by what it says. Anyone can call that BS or an opinion at anytime they please, however tell the State of IL its an opinion, dont tell me, because I DO NOT MAKE THE LAWS. Matter of fact, I'll make anyone a deal in this forum, and that is if someone can show me documented proof that I am wrong, and that I can run no muffler, or run any kind of muffler there is in Illinois legally and still pass emissions, I will put any kind of muffler on my vehicle they choose. I KNOW FOR FACT WHAT THE EMISSION TESTING PLACE TOLD ME ON THE PHONE, AND SHOWED ME IN WRITING, ALONG WITH WHAT ALL THE EXHAUST SHOPS IN MY CITY TOLD ME, and I dare any one to prove me wrong, becuase I will put any muffler they choose on my Jimmy. I DARE anyone to tell the state of Illinois they are wrong for doing so on their BS laws and therefore have to change them, because they have so many BS laws it funny. SO SOMEONE PLEASE PROVE THIS TO ME IS ALL I HAVE TO SAY!!!!!!!!!

Blazee and Blazer LT, both of you guys were so sure of yourselves before my last post. Is it you know that I am right and not every state has the same laws, and even though it maybe legal for a Ravin Muffler in Canada or Florida, it isnt where I live. Especially you Blazer LT, you sure do like running your mouth and like calling people liars, and just know your so smart, whats a matter, your not smart enough to take on the government? I'm really anxious to see what your reply is, because I truly would like to see you tell the Illinois Government they are wrong, and can not fail a vehicle on emissions over the type of muffler they have. Matter of fact, did you know that some cities in Illinois prohibit any performance muffler being put on a vehicle as they consider the noise volume to loud? I mean I have heard of people acting like they know it all, but your the very first person I have met, that will call anyone and everyone a liar, unless everything they say is exactly what you say. Your also the very first person that feels that any product you don't have isn't as good, or better than yours, and that all products on the market that you don't use are far from equivelant or better than yours. You truly must be someone that doesnt have a very high education level. I mean afterall most people in 6th grade or better, know better than you to sit there and call everyone a liar unless they feel the same. I am assuming anything and everything you believed is a fact, regardless of being proved. Afterall, you act like you have no opinions of your own, and anything you feel is automatically a fact.

Mufflers do not affect emmissions.

They can be outlawed due to noise by-laws, but they don't affect, effect, or cause ANY emmissions problems.

So if you think because of my geographical location that we don't know what we are talking about.

A muffler does not filter the exhaust gas coming out of your engine.

If you are saying that Flowmaster is allowed, but Ravin is not, then you sir are full of crap.

Personally I prefer Flowmaster (check my sig) even if they don't flow better than Ravin it could be because I have used them for years, but my opinion wasn't the point of this. The point was mufflers and emission laws. I hope you read the info in the last link I posted.

Illinois lists no laws against any type of muffler in their emissions laws:

VEHICLES
(625 ILCS 5/) Illinois Vehicle Code.

(625 ILCS 5/Ch. 13B heading) CHAPTER 13B. EMISSION INSPECTION
(625 ILCS 5/13B‑1)
Sec. 13B‑1. Short title. This Chapter may be cited as the Vehicle Emissions Inspection Law of 1995.
(Source: P.A. 88‑533.)

(625 ILCS 5/13B‑5)
Sec. 13B‑5. Definitions. For the purposes of this Chapter:
"Affected counties" means Cook County; DuPage County; Lake County; those parts of Kane County that are not included within any of the following ZIP code areas, as designated by the U.S. Postal Service on the effective date of this amendatory Act of 1994: 60109, 60119, 60135, 60140, 60142, 60144, 60147, 60151, 60152, 60178, 60182, 60511, 60520, 60545, and 60554; those parts of Kendall County that are not included within any of the following ZIP code areas, as designated by the U.S. Postal Service on the effective date of this amendatory Act of 1994: 60447, 60512, 60536, 60537, 60541, those parts of 60543 that are not within the census defined urbanized area, 60545, and 60560; those parts of McHenry County that are not included within any of the following ZIP code areas, as designated by the U.S. Postal Service on the effective date of this amendatory Act of 1994: 60001, 60033, 60034, 60071, 60072, 60097, 60098, 60142, 60152, and 60180; those parts of Will County that are not included within any of the following ZIP code areas, as designated by the U.S. Postal Service on the effective date of this amendatory Act of 1994: 60401, 60407, 60408, 60410, 60416, 60418, 60421, 60442, 60447, 60468, 60481, 60935 and 60950; those parts of Madison County that are not included within any of the following ZIP code areas, as designated by the U.S. Postal Service on the effective date of this amendatory Act of 1994: 62001, 62012, 62021, 62026, 62046, 62058, 62061, 62067, 62074, 62088, 62097, 62249, 62275, and 62281; those parts of Monroe County that are not included within any of the following ZIP code areas, as designated by the U.S. Postal Service on the effective date of this amendatory Act of 1994: 62244, 62248, 62256, 62261, 62276, 62278, 62279, 62295, and 62298; and those parts of St. Clair County that are not included within any of the following ZIP code areas, as designated by the U.S. Postal Service on the effective date of this amendatory Act of 1994: 62224, 62243, 62248, 62254, 62255, 62257, 62258, 62260, 62264, 62265, 62269, 62278, 62282, 62285, 62289, and 62298.
"Board" means the Illinois Pollution Control Board.
"Claim evaluation center" means an automotive diagnostic facility that meets the standards prescribed by the Agency for performing examinations of vehicle emissions inspection damage claims.
"Contractor" means the vehicle emissions test contractor for Official Inspection Stations described in Section 13B‑45.
"Inspection area" means Cook County, DuPage County, Lake County and those portions of Kane, Kendall, Madison, McHenry, Monroe, Will, and St. Clair Counties included in the definition of "affected counties".
"Owner" means the registered owner of the vehicle, as indicated on the vehicle's registration. In the case of an unregistered vehicle, "owner" has the meaning set forth in Section 1‑155 of this Code.
"Program" means the vehicle emission inspection program established under this Chapter.
"Resident" includes natural persons, foreign and domestic corporations, partnerships, associations, and all other commercial and governmental entities. For the purpose of determining residence, the owner of a vehicle shall be presumed to reside at the address indicated on the vehicle's registration. A governmental entity, including the federal government and its agencies, and any unit of local government or school district, any part of which is located within an affected county, shall be deemed a resident of an affected county for the purpose of any vehicle that is owned by the governmental entity and regularly operated in an affected county.
"Registration" of a vehicle means its registration under Article IV of Chapter 3 of this Code.
(Source: P.A. 92‑821, eff. 8‑21‑02.)

(625 ILCS 5/13B‑10)
Sec. 13B‑10. Program.
(a) The Agency shall establish a program to begin January 1, 1995, to reduce the emission of pollutants by motor vehicles. At a minimum, this program shall provide for all of the following:
(1) The inspection of certain motor vehicles every 2
years, as required under Section 13B‑15. (2) The establishment and operation of official inspection stations. (3) The designation of official test equipment and testing procedures. (4) The training and supervision of inspectors and other personnel. (5) Procedures to assure the correct operation, maintenance and calibration of test equipment. (6) Procedures for certifying test results and for reporting and maintaining relevant data and records. (b) The Agency shall provide for the operation of a sufficient number of official inspection stations to prevent undue difficulty in obtaining the inspections required under this Chapter. In the event that the Agency operates inspection stations or contracts with one or more parties to operate inspection stations on its behalf, the Agency shall endeavor to: (i) locate the stations so that the owners of vehicles subject to inspection reside within 12 miles of an official inspection station; and (ii) have sufficient inspection capacity at the stations so that the usual wait before the start of an inspection does not exceed 20 minutes.
(Source: P.A. 88‑533.)
(625 ILCS 5/13B‑15)
Sec. 13B‑15. Inspections.
(a) Beginning with the implementation of the program required by this Chapter, every motor vehicle that is owned by a resident of an affected county, other than a vehicle that is exempt under subsection (f) or (g), is subject to inspection under the program.
The Agency shall send notice of the assigned inspection month, at least 15 days before the beginning of the assigned month, to the owner of each vehicle subject to the program. For a vehicle that was subject to inspection before the effective date of this amendatory Act of 1994 and for which an initial inspection sticker or initial inspection certificate has already been issued, the month to be assigned by the Agency for that vehicle shall not be earlier than the current assigned month, unless so requested by the owner. If the assigned month is later than the current assigned month, the Agency shall issue either a corrected inspection sticker or corrected certificate for that vehicle.
Initial emission inspection stickers or initial inspection certificates, as the case may be, expire on the last day of the third month following the month assigned by the Agency for the first inspection of the vehicle. Renewal inspection stickers or certificates expire on the last day of the third month following the month assigned for inspection in the year in which the vehicle's next inspection is required.
The Agency or its agent may issue an interim emission inspection sticker or certificate for any vehicle subject to inspection that does not have a currently valid emission inspection sticker or certificate at the time the Agency is notified by the Secretary of State of its registration by a new owner, and for which an initial emission inspection sticker or certificate has already been issued. Interim emission inspection stickers or certificates expire no later than the last day of the sixth complete calendar month after the date the Agency issued the interim emission inspection sticker or certificate.
The owner of each vehicle subject to inspection shall obtain an emission inspection sticker or certificate for the vehicle in accordance with this subsection. Before the expiration of the emission inspection sticker or certificate, the owner shall have the vehicle inspected and, upon demonstration of compliance, obtain a renewal emission inspection sticker or certificate. A renewal emission inspection sticker or certificate shall not be issued more than 5 months before the expiration date of the previous inspection sticker or certificate.
(b) Except as provided in subsection (c), vehicles shall be inspected every 2 years on a schedule that begins either in the second, fourth, or later calendar year after the vehicle model year. The beginning test schedule shall be set by the Agency and shall be consistent with the State's requirements for emission reductions as determined by the applicable United States Environmental Protection Agency vehicle emissions estimation model and applicable guidance and rules.
(c) A vehicle may be inspected out of its 2‑year inspection schedule when a new owner acquires the vehicle and it should have been, but was not, in compliance with this Act when the vehicle was acquired by the new owner.
(d) The owner of a vehicle subject to inspection shall have the vehicle inspected and obtain and display on the vehicle or carry within the vehicle, in a manner specified by the Agency, a valid unexpired emission inspection sticker or certificate in the manner specified by the Agency.
Any person who violates this subsection (d) is guilty of a petty offense, except that a third or subsequent violation within one year of the first violation is a Class C misdemeanor. The fine imposed for a violation of this subsection shall be not less than $50 if the violation occurred within 60 days following the date by which a new or renewal emission inspection sticker or certificate was required to be obtained for the vehicle, and not less than $300 if the violation occurred more than 60 days after that date.
(e) (1) For a $20 fee, to be paid into the Vehicle Inspection Fund, the Agency shall inspect:
(A) Vehicles operated on federal installations
within an affected county, pursuant to Title 40, Section 51.356 of the Code of Federal Regulations. (B) Federally owned vehicles operated in affected counties. (2) For a fee of $20, to be paid into the Vehicle Inspection Fund, the Agency may inspect:
(A) Vehicles registered in and subject to emission inspections requirements of another state. (B) Vehicles presented for inspection on a voluntary basis. Any fees collected under this subsection shall not offset normally appropriated Motor Fuel Tax Funds.
(f) The following vehicles are not subject to inspection:
(1) Vehicles not subject to registration under Article IV of Chapter 3 of this Code, other than vehicles owned by the federal government. (2) Motorcycles, motor driven cycles, and motorized pedalcycles. (3) Farm vehicles and implements of husbandry.
(4) Implements of warfare owned by the State or federal government. (5) Antique vehicles, custom vehicles, street rods, and vehicles of model year 1967 or before. (6) Vehicles operated exclusively for parade or ceremonial purposes by any veterans, fraternal, or civic organization, organized on a not‑for‑profit basis. (7) Vehicles for which a Junking Certificate has been issued by the Secretary of State under Section 3‑117 of this Code. (8) Diesel powered vehicles, and vehicles that are powered exclusively by electricity. (9) Vehicles operated exclusively in organized amateur or professional sporting activities, as defined in the Environmental Protection Act. (10) Vehicles registered in, subject to, and in compliance with the emission inspection requirements of another state. The Agency may issue temporary or permanent exemption stickers or certificates for vehicles temporarily or permanently exempt from inspection under this subsection (f). An exemption sticker or certificate does not need to be displayed.
(g) According to criteria the Agency may adopt, a motor vehicle may be exempted from the inspection requirements of this Section by the Agency on the basis of an Agency determination that the vehicle is located and primarily used outside of the affected counties or in other jurisdictions where vehicle emission inspections are not required. The Agency may issue an annual exemption sticker or certificate without inspection for any vehicle exempted from inspection under this subsection.
(h) Any owner or lessee of a fleet of 15 or more motor vehicles which are subject to inspection under this Section may apply to the Agency for a permit to establish and operate a Private Official Inspection Station.
(i) Pursuant to Title 40, Section 51.371 of the Code of Federal Regulations, the Agency shall establish a program of on‑road testing of in‑use vehicles through the use of remote sensing devices. The Agency shall evaluate the emission performance of 0.5% of the subject fleet or 20,000 vehicles, whichever is less. Under no circumstances shall on‑road testing include any sort of roadblock or roadside pullover or cause any type of traffic delay.
If, during the course of on‑road inspections, a vehicle is found to exceed the on‑road emissions standards established for the model year and type of vehicle, the Agency shall send a notice to the vehicle owner. The notice shall document the occurrence and results of on‑road exceedances. The notice of a second on‑road exceedance shall indicate that the vehicle has been reassigned and is subject to an out‑of‑cycle follow‑up inspection at an official inspection station. In no case shall the Agency send a notice of an on‑road exceedance to the owner of a vehicle that was found to exceed the on‑road emission standards established for the model year and type of vehicle if the vehicle is registered outside of the affected counties.
(Source: P.A. 92‑668, eff. 1‑1‑03.)
(625 ILCS 5/13B‑20)
Sec. 13B‑20. Rules and standards.
(a) The Agency shall propose standards necessary to achieve reductions in the emission of hydrocarbons, carbon monoxide, and oxides of nitrogen from motor vehicles subject to inspection under this Chapter. Within 120 days after the Agency proposes these standards, the Board shall adopt rules establishing standards for the emission of hydrocarbons, carbon monoxide, and oxides of nitrogen from motor vehicles subject to inspection under this Chapter. These rules may be amended from time to time pursuant to Agency proposals. The Board shall set standards necessary to achieve the reductions in vehicle hydrocarbons, carbon monoxide, and oxides of nitrogen emissions, as determined by the applicable vehicle emission estimation model and rules developed by the United States Environmental Protection Agency, required by the federal Clean Air Act. A predetermined rate of failure shall not be used in determining standards necessary to achieve the reductions in vehicle hydrocarbons, carbon monoxide and oxides of nitrogen emissions. The emission standards established by the Board for vehicles of model year 1981 or later shall be identical in substance, as defined in Section 7.2(a) of the Environmental Protection Act, to the emission standards promulgated by the United States Environmental Protection Agency.
If the Administrator of the United States Environmental Protection Agency finds that oxides of nitrogen emission reductions are not beneficial under Title 40, Section 51.351(d) of the Code of Federal Regulations, the Board shall not adopt rules establishing such standards for the emission of oxides of nitrogen under this Chapter. Any rules establishing these standards that have already been adopted before the findings by the United States Environmental Protection Agency shall be repealed by the Board by preemptory rulemaking under the Illinois Administrative Procedure Act upon petition by the Agency.
Except as otherwise provided in this subsection, subsection (b) of Section 27 of the Environmental Protection Act and the rulemaking provisions of the Illinois Administrative Procedure Act shall not apply to rules adopted by the Board under this subsection. Challenges to the validity of rules adopted by the Board under this subsection (a) may only be brought by filing a petition for review in the Appellate Court under Section 29 of the Environmental Protection Act within 35 days after the rule is filed with the Secretary of State.
(b) The Agency shall establish, and may from time to time amend, procedures designed to implement this Chapter.
(Source: P.A. 88‑533.)

(625 ILCS 5/13B‑25)
Sec. 13B‑25. Performance of inspections.
(a) The inspection of vehicles required under this Chapter shall be performed only: (i) by inspectors who have been certified by the Agency after successfully completing a course of training and successfully passing a written test; (ii) at official inspection stations or official on‑road inspection sites established under this Chapter; and (iii) with equipment that has been approved by the Agency for these inspections.
(b) Except as provided in subsections (c) and (d), the inspection shall consist of (i) a loaded mode exhaust gas analysis; (ii) an evaporative system integrity test; (iii) an on‑board computer diagnostic system check; and (iv) a verification that all required emission‑related recall repairs have been made under Title 40, Section 51.370 of the Code of Federal Regulations; and may also include an evaporative system purge test. The owner of the vehicle or the owner's agent shall be entitled to an emission inspection certificate issued by an inspector only if all required tests are passed at the time of the inspection.
(c) A steady‑state idle exhaust gas analysis may be substituted for the loaded mode exhaust gas analysis and the evaporative purge system test in the following cases:
(1) On any vehicle of model year 1980 or older.
(2) On any heavy duty vehicle with a manufacturer
gross vehicle weight rating in excess of 8,500 pounds. (3) On any vehicle for which loaded mode testing is not possible due to vehicle design or configuration. (d) The procedures contained in subsections (d)(1) and (d)(2) of this Section shall be followed on model year 1996 and newer vehicles equipped with OBD on‑board computer diagnostic equipment, as required.
(1) Beginning on July 1, 2002, and continuing through December 31, 2003, such vehicles shall be given a complete on‑board diagnostic test consistent with the requirements of paragraphs (d)(1)(A) through (d)(1)(D) of this Section. (A) If the vehicle meets the standards set for the complete on‑board computer diagnostic test, neither the loaded mode exhaust gas analysis nor the idle exhaust gas analysis shall be performed; however, all other elements of the test contained in subsection (b) of this Section shall be performed. (B) If, however, the vehicle fails to meet the standard for the complete on‑board computer diagnostic test, it shall be given the loaded mode exhaust gas analysis or the idle exhaust gas analysis, as required, and all other elements of the test contained in subsection (b) of this Section, unless the owner of the vehicle chooses to avoid the loaded mode exhaust gas analysis or idle exhaust gas analysis and proceed directly under paragraph (d)(1)(C) of this Section. For those vehicles that fail to meet the standard for the complete on‑board computer diagnostic test, the owner of the vehicle must be informed that he or she has the option to have the vehicle tested using the less stringent loaded mode exhaust gas analysis or the idle exhaust gas analysis, as appropriate, for one test cycle. (C) If the vehicle fails to meet the standard for the complete on‑board computer diagnostic test and the standard for the loaded mode exhaust gas analysis or the idle exhaust gas analysis, as required, or the owner of the vehicle has chosen to avoid the loaded mode exhaust gas analysis or idle exhaust gas analysis and proceed directly under this paragraph, the vehicle must be repaired to pass either the complete on‑board computer diagnostic test or the loaded mode exhaust gas analysis or idle exhaust gas analysis, as required, and all other elements of the test contained in subsection (b) of this Section. (D) The on‑board computer diagnostic test shall not be a required element of the inspection mandated by this Section for such vehicles for which on‑board computer diagnostic testing is not possible due to the vehicle's originally certified design or its design as modified in accordance with federal law and regulations, or for vehicles with known on‑board diagnostic communications or software problems, as determined by the Agency. In such cases, all other elements of the inspection required under this Section shall be performed on such vehicles, including the exhaust gas analysis as specified in subsection (b) of this Section. By April 15, 2003, the Agency shall submit to the General Assembly a report detailing the effectiveness of the use of the on‑board computer diagnostic test. The report shall include the number of failures, the reason for each failure, the number of vehicle damage complaints, and the average wait time at the test stations. (2) Beginning on January 1, 2004, such vehicles shall be given a complete on‑board diagnostic test consistent with the requirements of paragraphs (d)(2)(A) and (d)(2)(B) of this Section. (A) The loaded mode exhaust gas analysis specified in subsection (b) of this Section shall not be performed on such vehicles for which the on‑board computer diagnostic test specified in subsection (h) of this Section can be performed. All other elements of the inspection required for such vehicles shall be performed in accordance with the provisions of this Section. (B) The on‑board computer diagnostic test shall not be a required element of the inspection mandated by this Section for such vehicles for which on‑board computer diagnostic testing is not possible due to the vehicle's originally certified design or its design as modified in accordance with federal law and regulations, or for vehicles with known on‑board diagnostic communications or software problems, as determined by the Agency. In such cases, all other elements of the inspection required under this Section shall be performed on such vehicles, including the exhaust gas analysis as specified in subsection (b) of this Section. (e) The exhaust gas analysis shall consist of a test of an exhaust gas sample to determine whether the quantities of exhaust gas pollutants emitted by the vehicle meet the standards set for vehicles of that type under Section 13B‑20. A vehicle shall be deemed to have passed this portion of the inspection if the evaluation of the exhaust gas sample indicates that the quantities of exhaust gas pollutants emitted by the vehicle do not exceed the standards set for vehicles of that type under Section 13B‑20 or an inspector certifies that the vehicle qualifies for a waiver of the exhaust gas pollutant standards under Section 13B‑30.
(f) The evaporative system integrity test shall consist of a procedure to determine if leaks exist in all or a portion of the vehicle fuel evaporation emission control system. A vehicle shall be deemed to have passed this test if it meets the criteria that the Board may adopt for an evaporative system integrity test.
(g) The evaporative system purge test shall consist of a procedure to verify the purging of vapors stored in the evaporative canister. A vehicle shall be deemed to have passed this test if it meets the criteria that the Board may adopt for an evaporative system purge test.
(h) The on‑board computer diagnostic test shall consist of accessing the vehicle's on‑board computer system, if so equipped, and reading any stored diagnostic codes that may be present. The vehicle shall be deemed to have passed this test if the codes observed did not exceed standards set for vehicles of that type under Section 13B‑20.
(Source: P.A. 92‑682, eff. 7‑16‑02.)
(625 ILCS 5/13B‑30)
Sec. 13B‑30. Waivers.
(a) The Agency shall certify that a vehicle that has failed a vehicle emission retest qualifies for a waiver of the emission inspection standards if the following criteria are met:
(1) The vehicle has received all repairs and
adjustments for which it is eligible under any emission performance warranty provided under Section 207 of the federal Clean Air Act. (2) The Agency determines by normal inspection procedures that the vehicle's emission control devices are present and appear to be properly connected and operating. (3) Consistent with Title 40, Section 51.360 of the Code of Federal Regulations, for vehicles required to be tested under this Chapter, a minimum expenditure of at least $450 in emission‑related repairs exclusive of tampering‑related repairs have been made. (4) Repairs for vehicles of model year 1981 and later are conducted by a recognized repair technician. (5) Evidence of repair is presented consisting of either signed and dated receipts identifying the vehicle and describing the work performed and amount charged for eligible emission‑related repairs, or an affidavit executed by the person performing the eligible emission related repairs. (6) The repairs have resulted in an improvement in vehicle emissions as determined by comparison of initial and final retest results. (b) The Agency may issue an emission inspection certificate to vehicles failing a transient loaded mode emission retest if a complete documented physical and functional diagnosis and inspection shows that no additional emission‑related repairs are needed. This diagnostic inspection must be performed by the Agency or its designated agent and shall be available only to motorists whose vehicle was repaired by a recognized repair technician.
(c) The Agency may extend the emission inspection certificate expiration date by one year upon receipt of a petition by the vehicle owner that needed repairs cannot be made due to economic hardship. Consistent with Title 40, Section 51.360 of the Code of Federal Regulations, this extension may be granted more than once during the life of the vehicle.
(d) The Agency shall propose procedures, practices, and performance requirements for operation of vehicle scrappage programs by any person that wants to receive credits for certain emissions reductions from these vehicles. The proposal shall include the method of vehicle selection, testing of vehicle emissions, documentation of annual vehicle miles traveled, determination of emissions, and determination of emissions reductions credits. Any applicable guidance available from the United States Environmental Protection Agency regarding these programs shall also be considered by the Agency. Within 180 days after the Agency files this proposal, the Board shall adopt rules for vehicle scrappage programs. Subsection (b) of Section 27 of the Environmental Protection Act and the rulemaking provisions of the Illinois Administrative Procedure Act shall not apply to rules adopted by the Board under this subsection (d).
(e) The Agency may adopt procedures to purchase vehicles for scrap that are unable to meet emission inspection standards and for which motorists provide a signed estimate from a recognized repair technician that the cost of emission‑related repairs is expected to exceed an amount equal to one‑half of the current minimum expenditure required in item (3) of subsection (a) of this Section. If the Agency adopts such procedures, they must be included in the vehicle scrappage programs in subsection (d). Such procedures shall require the Agency to arrange for private sector funding for the purchase of at least 90% of the vehicles which will be purchased for scrap.
(f) The Agency may issue an emission inspection certificate for vehicles subject to inspection under this Chapter that are located and primarily used in an area subject to the vehicle emission inspection requirements of another state. Emission inspection certificates shall be issued under this subsection only upon receipt by the Agency of evidence that the vehicle has been inspected and is in compliance with the emission inspection requirements and standards applicable in the state or local jurisdiction where the vehicle is being used.
(Source: P.A. 90‑475, eff. 8‑17‑97.)
(625 ILCS 5/13B‑35)
Sec. 13B‑35. Inquiries. The Agency shall develop a means of responding to inquiries from inspectors and members of the public concerning the program, including (i) when inspections are required, (ii) what kind of inspections are required, (iii) whether emission inspection stickers or certificates previously required for a vehicle have been obtained, and (iv) the procedures for resolving disputes concerning inspections.
(Source: P.A. 88‑533.)

(625 ILCS 5/13B‑40)
Sec. 13B‑40. Grievance and damage claim requirements and procedures.
(a) Emissions inspection and waiver denial grievance procedures. Any person aggrieved by a decision regarding the failure of an emissions test or the denial of a waiver may file a petition with the Agency within 30 days after the decision was made, and the Agency shall thereupon investigate the matter. Within 45 days after its receipt of the petition, the Agency shall submit to the petitioner and any affected inspector or station its written determination of the correctness or incorrectness of the decision complained of. The written determination shall include a statement of the facts relied upon and the legal and technical issues decided by the Agency in making its determination, and may also include an order directing the inspector (i) to issue an emission inspection certificate for the vehicle effective on such date as the Agency may specify, (ii) to reinspect the vehicle, (iii) to apply the standards that the Agency has determined to be applicable, or (iv) to take any other action that the Agency deems to be appropriate. In conducting the investigation, the Agency may require the petitioner to present the vehicle for inspection by the Agency or its designated agent. The written determination of the Agency shall be subject to review in circuit court in accordance with the provisions of the Administrative Review Law, except that no challenge to the validity of a rule adopted by the Board under subsection (a) of Section 13B‑20 shall be heard by the circuit court if the challenge could have been raised in a timely petition for review under Section 13B‑20.
(b) Vehicle damage claim requirements and procedures.
(1) The contractor shall make vehicle damage claim
forms authorized by the Agency available for vehicle owners in sufficient quantities at all official inspection stations. (2) Notice of the vehicle damage claim procedures and the vehicle owner's rights in relation to a vehicle damage claim shall be conspicuously posted at all official inspection stations. (3) If a vehicle owner believes that his or her vehicle was damaged by an act or omission of the contractor during or as a result of an emissions inspection performed on or after August 1, 2002, the owner may initiate resolution of the damage claim under this subsection by complying with the following: (A) Within 30 days of the date of the vehicle emissions inspection that allegedly caused the vehicle damage, the vehicle owner shall submit a vehicle damage claim to the contractor at the Official Inspection Station at which the vehicle damage allegedly occurred. (B) Within 30 days of filing the claim, the owner shall submit to the contractor any relevant information relating to the owner's claim for vehicle damage, including but not limited to evaluations conducted by a claims evaluation center or automotive repair shop meeting standards prescribed by the Agency. (4) The contractor shall promptly notify the Agency of each vehicle damage claim received by the contractor under subdivision (b)(3) and shall forward to the Agency any additional information provided by the owner. (5) Within 60 days after the filing of a vehicle damage claim, the contractor shall notify the vehicle owner of its proposed resolution of the damage claim. (6) Within 30 days after receiving the contractor's proposed resolution of the damage claim, the owner may petition the Agency for a review of the adequacy and completeness of the contractor's proposed resolution. The petition shall be in a form specified by the Agency. (7) Upon receiving a petition for review, the Agency shall request the contractor to deliver to the Agency a copy of the contractor's proposed resolution of the damage claim, together with all documents, videotapes, and information relevant to the damage claim and the proposed resolution. The contractor shall provide the requested materials to the Agency within 15 days of receiving the Agency's request. (8) Within 30 days after receiving the relevant materials from the contractor, the Agency shall review the materials and determine whether the contractor's proposed resolution of the damage claim is adequate and complete. The Agency may deem the proposed resolution of the damage claim to be adequate and complete. If the Agency does not deem the proposed resolution of the damage claim to be adequate and complete, it may request the contractor to further investigate and evaluate the damage claim and resubmit its proposed resolution of the claim. The contractor shall then have 30 days to respond in writing to the Agency with the results of its further evaluation of the damage claim and its proposed resolution. (9) The Agency shall notify the vehicle owner in writing of the result of its review of the adequacy and completeness of the contractor's proposed resolution of the damage claim. Copies of all correspondence between the Agency and the contractor relating to the damage claim shall also be sent to the vehicle owner. (10) If, after the Agency's review, the vehicle owner still does not agree with all or a portion of the proposed resolution of the damage claim by the contractor, the vehicle owner may further pursue the damage claim through the binding arbitration process established by the contractor and accepted by the Agency, or in circuit court. (11) The Agency's review of the adequacy and completeness of the contractor's proposed resolution of a damage claim is not binding upon the vehicle owner or the contractor and does not affect the rights of the vehicle owner or the contractor under law. The Agency's review of the adequacy and completeness of the contractor's proposed resolution of a damage claim is not a final action subject to administrative review and is not subject to review by the Pollution Control Board or otherwise appealable.(Source: P.A. 92‑821, eff. 8‑21‑02.)
(625 ILCS 5/13B‑45)
Sec. 13B‑45. Contracts.
(a) The Agency may enter into contracts with one or more responsible parties to construct and operate official inspection stations, provide and maintain approved test equipment, administer tests, certify results, issue emission inspection stickers or certificates, maintain records, train personnel, or provide information to the public concerning the program.
These contracts (i) shall be subject to the Illinois Purchasing Act, (ii) may be for a term of up to 9 years, (iii) shall be in writing, and (iv) shall not take effect until a copy of the contract is filed with the State Comptroller.
(b) In preparing its proposals for bidding by potential contractors, the Agency shall endeavor to include provisions relating to the following factors:
(1) The demonstrated financial responsibility of the
potential contractor. (2) The specialized experience and technical competence of the potential contractor in connection with the type of services required and the complexity of the project. (3) The potential contractor's past record of performance on contracts with the Agency, with other government agencies or public bodies, and with private industry, including such items as cost, quality of work, and ability to meet schedules. (4) The capacity of the potential contractor to perform the work within the time limitations. (5) The familiarity of the potential contractor with the types of problems applicable to the project. (6) The potential contractor's proposed method to accomplish the work required including, where appropriate, any demonstrated capability of exploring and developing innovative or advanced techniques and methods. (7) Avoidance of personal and organizational conflicts of interest prohibited under federal, State, or local law. (8) The potential contractor's present and prior involvement in the community and in the State of Illinois. (c) Any contract for the operation of one or more official inspection stations shall include a provision that the contractor shall not perform emission‑related repairs or adjustments to vehicles, other than to the contractor's own vehicles, necessary to enable vehicles to pass Illinois emission inspections.
(Source: P.A. 88‑533.)
(625 ILCS 5/13B‑50)
Sec. 13B‑50. Costs.
(a) Except as otherwise provided in subsection (e) of Section 13B‑15, no fee shall be charged to motor vehicle owners for obtaining inspections required under this Chapter. The Vehicle Inspection Fund, which is a fund created in the State treasury for the purpose of receiving moneys from the Motor Fuel Tax Fund and other sources, shall be used, subject to appropriation, for the payment of the costs of the program, including reimbursement of those agencies of the State that incur expenses in the administration or enforcement of the program. The Vehicle Inspection Fund shall continue in existence notwithstanding the repeal of Chapter 13A. Any money in the Vehicle Inspection Fund on January 1, 1995, shall be used for the purposes set forth in this Chapter.
(b) The Agency may acquire, own, maintain, operate, sell, lease and otherwise transfer real and personal property and interests in real and personal property for the purpose of creating or operating inspection stations and for any other purpose relating to the administration of this Chapter, and may use money from the Vehicle Inspection Fund for these purposes.
(Source: P.A. 88‑533.)

(625 ILCS 5/13B‑55)
Sec. 13B‑55. Enforcement.
(a) The Agency shall cooperate in the enforcement of this Chapter by (i) identifying probable violations through computer matching of vehicle registration records and inspection records; (ii) sending one notice to each suspected violator identified through such matching, stating that registration and inspection records indicate that the vehicle owner has not complied with this Chapter; (iii) directing the vehicle owner to notify the Agency or the Secretary of State if he or she has ceased to own the vehicle or has changed residence; and (iv) advising the vehicle owner of the consequences of violating this Chapter.
The Agency shall cooperate with the Secretary of State in the administration of this Chapter and the related provisions of Chapter 3, and shall provide the Secretary of State with such information as the Secretary of State may deem necessary for these purposes, including regular and timely access to vehicle inspection records. The Agency shall be reimbursed for the cost of providing this information.
The Secretary of State shall cooperate with the Agency in the administration of this Chapter and shall provide the Agency with such information as the Agency may deem necessary for the purposes of this Chapter, including regular and timely access to vehicle registration records. Section 2‑123 of this Code shall not apply to the provision of this information, but the Secretary of State shall be reimbursed for the cost of providing the information.
(b) The Secretary of State shall suspend either the driving privileges or the vehicle registration, or both, of any vehicle owner who has not complied with this Chapter, if (i) the vehicle owner failed to satisfactorily respond to the one notice sent by the Agency under subsection (a), and (ii) the Secretary of State has mailed the vehicle owner a notice that the suspension will be imposed if the owner does not comply within a stated period, and the Secretary of State has not received satisfactory evidence of compliance within that period. The Secretary of State shall send this notice only after receiving a statement from the Agency that the vehicle owner has failed to comply with this Section. Notice shall be effective as specified in subsection (c) of Section 6‑211 of this Code.
A suspension under this subsection shall not be terminated until satisfactory proof of compliance has been submitted to the Secretary of State. No driver's license or permit, or renewal of a license or permit, may be issued to a person whose driving privileges have been suspended under this Section until the suspension has been terminated. No vehicle registration or registration plate that has been suspended under this Section may be reinstated or renewed, or transferred by the owner to any other vehicle, until the suspension has been terminated.
The filing fee for an administrative hearing to contest a suspension made under this Section shall be $20, to be paid by the vehicle owner at the time written request for the hearing is made to the Secretary of State.
The Secretary of State may promulgate rules to enable him or her to carry out his or her duties under this Chapter.
(Source: P.A. 88‑533.)

(625 ILCS 5/13B‑60)
Sec. 13B‑60. Other offenses.
(a) Any person who knowingly displays an emission inspection sticker or exemption sticker on any vehicle other than the one for which the sticker was lawfully issued in accordance with the provisions of this Chapter, or duplicates, alters, uses, possesses, issues, or distributes any emission inspection sticker, exemption sticker, inspection certificate, or facsimile thereof, except in accordance with the provisions of this Chapter and the rules and regulations adopted hereunder, is guilty of a Class C misdemeanor.
(b) A vehicle owner shall pay a monetary fine equivalent to the test fee plus the applicable waiver repair expenditure for the continued operation of a noncomplying vehicle beyond 4 months past the expiration of the vehicle emission inspection certificate. Any fines collected under this Section shall be divided equally between the local jurisdiction issuing the citation and the Vehicle Inspection Fund.
(Source: P.A. 88‑533.)

(625 ILCS 5/13B‑70)
Sec. 13B‑70. Legislative intent. It is the intent of the General Assembly that, to the greatest extent possible, there be continuity in the operation of the Vehicle Emissions Inspection Programs under this Chapter and Chapter 13A during the transition phase when certain affected counties become subject to the program under this Chapter instead of the program under Chapter 13A.
(Source: P.A. 88‑533.)

(625 ILCS 5/13B‑75)
Sec. 13B‑75. Home rule. Pursuant to subsections (h) and (i) of Section 6 of Article VII of the Illinois Constitution, the exercise by a home rule unit of any power which is inconsistent with this Chapter is hereby specifically denied and preempted, and the vehicle emission inspection program created by this Chapter is hereby declared to be the subject of exclusive State jurisdiction.
(Source: P.A. 88‑533.)



They do list "noise" (not emission related) laws against mufflers, though:


(625 ILCS 5/12‑602) (from Ch. 95 1/2, par. 12‑602)
Sec. 12‑602. Mufflers, prevention of noise.
Every motor vehicle driven or operated upon the highways of this State shall at all times be equipped with an adequate muffler or exhaust system in constant operation and properly maintained to prevent any excessive or unusual noise. No such muffler or exhaust system shall be equipped with a cutout, bypass or similar device. No person shall modify the exhaust system of a motor vehicle in a manner which will amplify or increase the noise of such vehicle above that emitted by the muffler originally installed on the vehicle, and such original muffler shall comply with all the requirements of this Section.
(Source: P. A. 77‑37.)


Which basically means that if Ravins are illegal, so are flowmasters.

As far as agreeing with you that mufflers have no affect on emissions and that the only purpose of mufflers are to reduce the noise, I agree fully with that. I myself am aware that they do not affect emissions. However according to the 2 of the state emission testing facilities(in my immediate area) and according to the exhaust shops in my city(4 shops), the state of Illinois EPA(who is in charge of emission testing in my state) has deemed that Ravin mufflers allow too much exhaust to flow through it. I can't say why they deemed them to be illegal, as far as if it has to do with the noise, or do to them thinking it affects emissions. It could be do to the noise, the only reason why I have a hard time believing that, is because the EPA will not allow a vehicle to pass emission testing with them, which doesnt make since if it was do to the noise. I doubt it is because of putting out more pollution, as I know myself that mufflers don't affect emissions. However in the state of Illinois, they do alot more than just testing emissions when you take it down. They also do a safety inspection, which includes the underside of the vehicle. Personally it doesnt make since to me why they would outlaw some mufflers, and not others(including flowmasters not being outlawed) however as I have said already, I have no control over what laws the screwed up state of Illinois makes(they make stupid laws concerning anything, pretty much if one person who works for the government, and decide they dont like something, the next thing you know the state or city one has a law against it).

Blazee, you are correct by what you posted, however those laws have been updated quite a few times since they originally came up with them in 1995, so therefore those laws don't mean a damn thing. I actually got a copy of the new laws, from the Illinois EPA, and if I could, I would post them on here, however I do not have a scanner, and I have been unable to find most recently updated copy of them online.

The name of the list of laws is "Vehicle Emissions Inspection Law of 1995" that doesn't mean that they haven't been updated. Read it, all the updates are there..."Beginning on July 1, 2002, and continuing through December 31, 2003"......"By April 15, 2003"......"Beginning on January 1, 2004"......

This is the most up to date laws as listed by the Illinois state government, they came from this site:
http://www.ilga.gov/

Here's the link to the laws:
http://www.ilga.gov/legislation/ilcs/ilcs4.asp?DocName=062500050HCh%2E+13B&ActID=1815&ChapAct=625%26nbsp%3BILCS%26nbsp%3B5%2F&ChapterID=49&ChapterName=VEHICLES&SectionID=28790&SeqStart=132700&SeqEnd=136125&ActName=Illinois+Vehicle+Code%2E

Yip, and therefore they are up to date.

You can install a flowmaster if you want on your truck, I really don't care if you do.

It is when you spread incorrect information like "Illinois doesn't allow them" that I have an issue with and that is why we are pressing this.

You are spreading incorrect information about this muffler. Saying that the state allows a Flow40 and doesn't allow a Ravin is a completely wrong.

They cannot stop you from installing one brand of muffler because it "flows too much". Pretty ridiculous I think.

You can install any muffler you want and I have no issue with that, but when you state that the laws state you can't and we prove that there is no law about that and you state that they are no longer valid because of the date "which is not true", this situation is bordering on ridiculous.

There is nothing in the laws that state that, and to inform a person that lives in your state that reads this thread, we have to set it straight so that they are not ill-informed.

You can believe or feel anytime you want that I am wrong, however, I know myself the Illinois last updated laws concerning emissions took place January 1st of this year, also if you believe the state update their websites everytime they update or make a new law, you are TRULY mistaken. So you can call me wrong all you want, and you can go advertise to anyone that I am wrong, however anyone living in Illinois that goes to get a Ravin will find out soon enough that I am correct and you guys are wrong.

And what if we find out that that is incorrect?

Is there going to be some other excuse??

I'll talk to some people and have them call the State government tomorrow to ask.

LOL, This is funny. I am trying to compare this post with the FRAM Filters one. They are both hilarious. I personally have never heard of the muffler having anything to do with emmisions, only the Cat. But yeah, my question is..... I live in minnesota which has no emmisions, but I am wondering if I need to keep the cat on mine? With my CPI problems I toasted my cat, and I am going to run some new exhaust and I want to cut the cat out. Does that affect the back pressure? Will I get better or worse performance without the cat? Also what muffler will have the meanist sound? I know its tricky with V6's. That raven sounds pretty cool. My friend has a flow master on his jimmy but I don't like the sound. Thanks, Rob. Oh yeah, I bought a fram filter from walmart and before I did my oil change I read the post about filters. So I pissed in it and threw it away. lol!!!!

LOL, This is funny. I am trying to compare this post with the FRAM Filters one. They are both hilarious. I personally have never heard of the muffler having anything to do with emmisions, only the Cat. But yeah, my question is..... I live in minnesota which has no emmisions, but I am wondering if I need to keep the cat on mine? With my CPI problems I toasted my cat, and I am going to run some new exhaust and I want to cut the cat out. Does that affect the back pressure? Will I get better or worse performance without the cat? Also what muffler will have the meanist sound? I know its tricky with V6's. That raven sounds pretty cool. My friend has a flow master on his jimmy but I don't like the sound. Thanks, Rob. Oh yeah, I bought a fram filter from walmart and before I did my oil change I read the post about filters. So I pissed in it and threw it away. lol!!!!

On your 95, you will have an O2 sensor after the cat. Removing the cat will have this sensor trip a code and will screw up your fuel ratios.

The only way to get around it is to install and O2 sensor simulator in place of the post cat sensor.

I honestly would just install a high flow 2.25" universal cat. They can be purchased really cheap on ebay and installation won't cost much.

LOL, This is funny. I am trying to compare this post with the FRAM Filters one. They are both hilarious. I personally have never heard of the muffler having anything to do with emmisions, only the Cat. But yeah, my question is..... I live in minnesota which has no emmisions, but I am wondering if I need to keep the cat on mine? With my CPI problems I toasted my cat, and I am going to run some new exhaust and I want to cut the cat out. Does that affect the back pressure? Will I get better or worse performance without the cat? Also what muffler will have the meanist sound? I know its tricky with V6's. That raven sounds pretty cool. My friend has a flow master on his jimmy but I don't like the sound. Thanks, Rob.
I suggest that you leave the cat on. Even though you don't have emissions testing, it is still illegal to tamper with emissions systems. I don't have emission testing in my area either, but there is a law that any vehicle manufactured after 1976 must have a cat. If you have loud exhaust and you annoy the cop, occassionally they will take a peak to see if you got one. (not because they care, but they do it just to find more charges) There's a cop here that runs open headers on his 4x4. :)

There is also the issue that BlazerLT mentioned about the O2 sensor. If you remove the cat, you have to use the dummy O2 sensor.

If you need a new cat, the best deal that I have seen is from SummitRacing.com. They have a Magnaflow direct fit cat for about $130. You just bolt it on. No installation fee.

Oh yeah, I bought a fram filter from walmart and before I did my oil change I read the post about filters. So I pissed in it and threw it away. lol!!!!
:lol: :lol:

On your 95, you will have an O2 sensor after the cat. Removing the cat will have this sensor trip a code and will screw up your fuel ratios.

The only way to get around it is to install and O2 sensor simulator in place of the post cat sensor.

I honestly would just install a high flow 2.25" universal cat. They can be purchased really cheap on ebay and installation won't cost much.

Personally I agree with Blazer LT on replacing it with a high flow 2.25" universal cat. As already said, my cat also went bad from the the CPI and Nut Kit leaking. I can't say what all performance places or exhaust shops in your area, however I just ordered mine Friday(be here Monday) from a performance store here in my town, and its just a universal 2.25" cat high flow, which is nothing more than bolt on also, and I was able to pick it up for $106 total including taxes.

Universal cats are not just bolt on. Universal cats require cutting out the old cat and fitting the new one in. They also have a tendency to leak if not welded. Direct fit bolt on cats are premade to bolt to the existing flanges. You simply unbolt the old cat and then put the new one on. The price difference is minimal and IMO the direct fit are much better, because they are less likely to develop leaks.

Universal cats are not just bolt on. Universal cats require cutting out the old cat and fitting the new one in. They also have a tendency to leak if not welded. Direct fit bolt on cats are premade to bolt to the existing flanges. You simply unbolt the old cat and then put the new one on. The price difference is minimal and IMO the direct fit are much better, because they are less likely to develop leaks.

Well they showed me the exact cat im getting, the only difference between the one I was showed, and the one I am getting is the size because the one they showed me is 2.5", and it is a direct bolt on. They said they're universal, however they could be wrong, and it be a direct fit.

Direct fit cost almost twice the money.

Get a 2.25" universal and have it welded in and save money.

Don't allow them to bullshit you that it won't work because mine has one on right now.

You're right. When I said the difference was minimal, I was going by the local price for a universal cat ($100) plus figuring about $10 - $20 for installation and comparing that to the $130 for a direct fit cat and doing a self install.


I just checked some online prices and you can order a universal cat much cheaper. (about half the price)

I'm still going with the direct fit magnaflow, though. :)

I picked up a universal catco high flow for 65.00 when I went to summit. I used stainless band clamps (4"x4") and have yet to have it leak. Passed inspection fine as well.

Will this one work? http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=7931890380&category=33629&sspagename=WD1V

Will this one work? http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=7931890380&category=33629&sspagename=WD1V

It will work perfectly.

Alright, I finally got around to going to an exhaust shop and having my exhaust system looked it. It is truly indeed my catalytic converter thats broke up on the inside from all the fuel dumping through. My muffler is also beginning to show signs of replacement, so since I want custom exhaust anyway I am just going to go ahead and have the cat replaced with a highflow cat and have the muffler replaced with a flowmaster 40 series single inlet and dual outlet with stainless steel tips. Just figured I would let everyone know of what the rattling noise turned out to be.

Well, I just got around to getting my cat changed today with the highflow cat I bought. However I still have the rattle noise that sounds like a heat shield or exhaust manifold cracked or loose, along with a surging at low speeds, and somewhat rough idle, and kinda like a little miss. I know the rough idle, little miss, and surging are signs of the EGR Valve, however my EGR valve is not clogged, and I was told by 2 different mechanics that the problems I was having was do to my cat. However considering the cat been changed today, and I'm still experiencing the problems, the cat did not have any affect on the problems. Does anyone have any ideas what to do next, replace the EGR valve or what? Someone please help, because I'd love to keep the Jimmy, however Ive already spent about $1600 in repairs and yet I KEEP ON having problems, and am getting very close to getting rid of it.

remove and clean the EGR valve and reinstall with a new EGR gasket.

remove and clean the EGR valve and reinstall with a new EGR gasket.

Well I took out the EGR valve, and it was working properly, along with no carbon stuck in it, along with all the passages didnt seem to be blocked or anything, so I went on and put a new gasket on and put it back togather, and since I was stumped, went on and took it to a shop to have it looked it. Turns out my spark plugs are fowled, from the last when when the CPI was leaking and was replaced under warranty. So I'm going to go ahead and replace all 6 plugs, and go from there. If anyone has any suggestions or anything, please feel free to post it, as I am not 100% certain that the plugs are causing all of my problems. I know fowled plugs can cause rough idle and surging and all, however Ive never heard of or had fowled plugs cause a rattle on acceleration.

Use standard AC Delco plugs gapped at 0.045.

What other tuneup items have you done?

Hope you have changed the oil since the CPI was fixed.

Use standard AC Delco plugs gapped at 0.045.

What other tuneup items have you done?

Hope you have changed the oil since the CPI was fixed.

I did the air filter, fuel filter, PCV valve, plugs, wires, cap, and rotor when the CPI got fixed the first time. The oil change was done after the second time of the CPI leaking, and have kept an eye on it to make sure it doesnt smell like gas, and its good. As far as the type of plugs I plan on using Bosch Super as they're the cheapest I can find, and I've never had a problem with them before. Do you recommend changing the cap, rotor, and wires also, even though the shop didnt say they need replacement?

How old are the cap rotor and wires now?

How old are the cap rotor and wires now?

Air and fuel filters are about 1 month old, and the plugs, wires, cap, and rotor are about 3 weeks old. Please keep in mind though I found out today that I am laid off from my job, so I wont be spending no more money than abosulety needed just to keep it running proper, so any parts that do not need replacement, I am not going to do. Since plugs are fowled though, and don't cost very much at all, I will do that, but as far as wires, cap, or rotor or anything else, I am not going to replace unless they are needed, or unless someone can come up with a good reason why they need replacement.

Being that new I doubt they are defective.

What plugs did you use?

Did you set your timing with the timing wire disconnected from the PCM under the glove box yet?

Being that new I doubt they are defective.

What plugs did you use?

Did you set your timing with the timing wire disconnected from the PCM under the glove box yet?

I used Bosch Super plugs gapped at .045. No I havent set or checked the timing myself, since I don't have a timing light. The shop said that was one the first things they did was check the timing, and that it was where it should be.

You might want to have a friend check that out separately with the timing unconnected.

You might want to have a friend check that out separately with the timing unconnected.

So I'm taking it that you got think the timing could be off than? If so, could the spark plugs being fouled/and or the timing being off cause a rattle noise that sounds like a heat shield or manifold being loose? I had the same noise that was there before the cat was changed, and I was told it was the cat, but than even after that been changed its still there, but instead of sounding like its coming from the cat, it sounds like its coming from the back of the motor, and is alot quiter than what it was before the cat was changed. Would that be a spark knock from the plugs being fouled, or what? I tend to know alot about vehicles, but spark knock and timing are two things Ive never dealt with, and by far I'm no mechanic, and therefore not really sure.

Timing would cause the plugs to foul, have poor performance and would dump unburnt fuel into the cat which would ruin it.

I would rent a timing gun and check base timing with the timing wire disconnected.

Timing would cause the plugs to foul, have poor performance and would dump unburnt fuel into the cat which would ruin it.

I would rent a timing gun and check base timing with the timing wire disconnected.

Ok thanks, Ill have to check in to that. Personally I don't think its dumping any unburnt fuel now, I know the cat was ruined from when the CPI was leaking and dumping the fuel, and I know the plugs and all was changed after I changed the CPI, but than a couple days after the plugs were changed the CPI started leaking again and was replaced under warranty, and I'm thinking and thats what the shop said, caused the plugs to foul. However I will look in to the timing. Thanks for your input.

I just had a similiar problem on my 93. I went to advanced auto and purchased a 40.00 dollar fuel pressure tester and checked it myself. My pump kicked up to 56 psi but instantly dropped to 20 when the pump shut off. Therefore a put a new 75 dollar advanced auto pump in and my jimmy runs great.