map sensor

I have a 92 s-10 blazer with the vortec. Recently it started acting up on me. It wants to cut off, comes close, but never does. It also consumed a tremendous amount of gas until i replaced my map sensor. I got my fuel economy back which is a pluse, but it still "studders" even when I am idling. One more thing, evrytime it starts to die my exhuast had a "bubble" or "missing" sound to it. Its real annoying sitting at red lights and haveing people stare at me when my engine almost dies it surges so it looks like im trying to race them. Please any suggestions?

Clean and replace you IAC and EGR valve.

Remove your IMTV valve in the top of your engine under the Vortec plate and check for gas smell and washing inside.

Look for pools of gas in there too.

ok quick question what where and what does my iac do?

what does i look like?

http://www.tweaknews.net/decarbon/IAC.JPG

Idle Air Control Valve

Allows a metered amoutn of air in to control idle.

Clean your IAC and reinstall.

clean your EGR and reinstall with a new gasket.

Look for leaks in the upper plenum.

Also, buy a repair manual for your truck. It will save you 1000s.

I agree with you there, I DO own a haynes manual and is very helpful.

Ok I recently did clean my egr valve and replace the gasket.

How do I go about checking for leaks in the plenum? (soapy water?)

Where is my IAC located? on top od the intakeplenum?

Is the IMTV that little round sencor under the vortec plastic?
And are you implying maybe my spider, i think they call is faulty, because i payed $500 to repair this 2 years ago.

And finally where did u find that bad ass air intake I cant find one any where? How much did it cost you if u dont mind me asking?

Sorry so many questions I am very interested in getting my truck back to normal, any help would be greatly appreciated, I think I can trust ur judgement blazerLT u seem like a very smart guy when it comes to blazers!

Ok I recently did clean my egr valve and replace the gasket.

Did you clean it with throttle body cleaner and made sure the pintle was seating properly before reinstalling it?

How do I go about checking for leaks in the plenum? (soapy water?)

I meant looking into the IMTV valve under the vortec plate INTO the upper plenum.

Where is my IAC located? on top od the intakeplenum?

Please see the picture in my last reply.

Is the IMTV that little round sencor under the vortec plastic? And are you implying maybe my spider, i think they call is faulty, because i payed $500 to repair this 2 years ago.

Yes, the round thing is the IMTV is a valve under the vortec plate. Remove it and take a good flashlight and look into the upper plenum and smell for gas and look for clean golden areas that were washed clean from the leaking Injector in the small area you can see on the passenger side area inside the plenum.

If you smell gas it is your internal fuel line kit or the CPI injector has gone again.

And finally where did u find that bad ass air intake I cant find one any where? How much did it cost you if u dont mind me asking?

Ebay is the best place to find these intake.

Here is the cheaper ones that do very well for the cheap price they have:

http://search-desc.ebay.com/92-95-blazer-air-intake_W0QQsofocusZbsQQsbrftogZ1QQfromZR10QQsatitl eZ92-95Q20blazerQ20airQ20intakeQQsotextsearchedZ2QQsotr Z2QQcoactionZcompareQQcopagenumZ1QQcoentrypageZsea rch

And here are some K&N's like mine for our year.:

http://www.knfilterchargers.com/search/product.aspx?Prod=57-3009

Ebay listings for the K&N:

http://search-desc.ebay.com/57-3009_W0QQsofocusZbsQQsbrftogZ1QQfromZR10QQsatitleZ 57-3009QQsotextsearchedZ2QQsotrZ2QQsosortpropertyZ1QQ sosortorderZ1

Sorry so many questions I am very interested in getting my truck back to normal, any help would be greatly appreciated, I think I can trust ur judgement blazerLT u seem like a very smart guy when it comes to blazers!

Thank you, I am only here to help.

And help you did!! Thank You Much!!!

ok i removed the imtv looked in its very dirty and a faint very faint sent of gas is present no clean golden area u speak of just lots of dirty fuel lines. do u think this eliminates the faulty fuel line theory?
And another thing i cleaned my iac and noticed the springy part of it movd very little with great force is this normal? I appreciate any help.

I never told you to push hard on the pintle did I?

I hope it came back to the proper length of you just destroyed a $100 valve for no reason.

Shit!! No it nevered moved out of place. What would it do if the truck do if this was the case?
I just got back from town on it it seemed like its normal wanting to cut off self.

You have to remove the IAC again and make sure from flange to tip it is 1.10inches (28mm).

Don't do that again.

another guestion that is way off subject. Do u have a cam shaft position sensor?

Me? Yes.

where is it locate? and if this wears out could it cause ur truck to run like mine? i was told it could be my cam shaft position sensor causing my truck to run rough.

Lets concentrate on the others before we go into that question.

Have you cleaned the EGR valve?

yes i had no large deposits of carbon in it just a dark black hole.
i swept it clean with a dremel and a wire brush and reinstalled the new gasket.

So the valve was clean?

Did the valve have a valve pintle pushing against one of the holes?

im not shure what u r talking about so i assumed it didnt. all i saw was a big hole with 2 screw holes on either side.

You sure you removed the EGR valve?

Here is what it looks like:

http://i10.ebayimg.com/01/i/02/9a/a7/30_1.JPG

See where one of the holes is plugged with a pintle, make sure there is no carbon or grit there and clean the inside of the valve with throttle body cleaner.

I bought an EGR valve like yours brnd new from www.gm-car-parts.com for under $150.00. The local dealer wanted over $210.00 here. The site is easy to use and you can look up parts urself using thier online catalogs 24-7.

oh i see now. well i didnt really think about it, but im shure its seated properly? thanx for the web site bob!

Did you remove this valve and check it over?

Am I helping anyone here or beating my head against a wall?