Error codes P0171-P0175
IdahoRodeo
03-06-2004, 04:42 PM
Within the last two weeks my 2000 Rodeo has begun running rough, whisling, and triggering the listed error codes.
P0171 System too Lean (Bank 1)
P0172 System too Rich (Bank 1)
P0173 Fuel Trim Malfunction (Bank 2)
P0174 System too Lean (Bank 2)
P0175 System too Rich (Bank 2)
My first thought was O2 sensors so I attached my code reader and checked the operational data as it ran. The 2 upstream sensors (sensor 1 on banks 1 and 2). They both read 0V at idle and then begin to sweep 0V to .9V at higher RPM. Is this normal? I have always seen O2 sensors sweep continuously at idle or above. Also the 2 downstream sensors (sensor 2 on banks 1 and 2), read 0V at idle and then will range from about .3V to .7 volt at higher rpm.
The whistle went away after 2 days. My original thought was the intake manifold gasket.
Any assistance would be great.
P0171 System too Lean (Bank 1)
P0172 System too Rich (Bank 1)
P0173 Fuel Trim Malfunction (Bank 2)
P0174 System too Lean (Bank 2)
P0175 System too Rich (Bank 2)
My first thought was O2 sensors so I attached my code reader and checked the operational data as it ran. The 2 upstream sensors (sensor 1 on banks 1 and 2). They both read 0V at idle and then begin to sweep 0V to .9V at higher RPM. Is this normal? I have always seen O2 sensors sweep continuously at idle or above. Also the 2 downstream sensors (sensor 2 on banks 1 and 2), read 0V at idle and then will range from about .3V to .7 volt at higher rpm.
The whistle went away after 2 days. My original thought was the intake manifold gasket.
Any assistance would be great.
amigo-2k
03-06-2004, 05:57 PM
Yup, you got it right it is the intake manifold. The whistle is caused by a hole, as the hole gets bigger it goes away. If you are the orginal owner the gasket is covered for 10yr/120k
see my FAQ link before for more info
-Ryan
see my FAQ link before for more info
-Ryan
rodeo02
03-06-2004, 07:59 PM
Sure enough. That's the classic symptoms of a cracked intake manifold gasket. A freebie fix for you!
G/luck
Joel
G/luck
Joel
IdahoRodeo
03-06-2004, 08:54 PM
I was afraid I would get these replies. I appreciate the responses. Thanks a bunch for the information. I don't have any reserve about ripping the manifold off, however, some sort of manual would be nice. From what I can tell nobody is making one yet for a 2000 Rodeo. Is that true?
amigo-2k
03-06-2004, 10:28 PM
Nope the Helm make a manual. Check my FAQ,
again if you're the first owner Isuzu will fix it for free.
again if you're the first owner Isuzu will fix it for free.
IdahoRodeo
03-06-2004, 11:00 PM
I wish I were the first owner(2nd). I'll check your FAQ. Thanks again
Davejb
03-08-2004, 06:59 AM
The second owner of the vehicle has a 5 year 60k mile powertrain warranty, so if your under your still covered.
rodeo02
03-08-2004, 10:13 AM
I was afraid I would get these replies. I appreciate the responses. Thanks a bunch for the information. I don't have any reserve about ripping the manifold off, however, some sort of manual would be nice. From what I can tell nobody is making one yet for a 2000 Rodeo. Is that true?
There is a (older) write-up on the 4x4wire board in regards to the 1998+ 3.2/3.5 IMG replacement (cant seem to find it !@#$). IIRC- It's pretty straight forward. The hardest part is removing the exhaust feed tube fitting at the EGR base. You need to take that off so you can raise the IM up just enough to yank out the old gasket(s) & slide in the new ones.
G/luck
Joel
There is a (older) write-up on the 4x4wire board in regards to the 1998+ 3.2/3.5 IMG replacement (cant seem to find it !@#$). IIRC- It's pretty straight forward. The hardest part is removing the exhaust feed tube fitting at the EGR base. You need to take that off so you can raise the IM up just enough to yank out the old gasket(s) & slide in the new ones.
G/luck
Joel
amigo-2k
03-08-2004, 04:11 PM
I think the following post will help (I also added this to my FAQ page):
This message was from Sam Jelinek, who many of you know from ZuZoo and elsewhere. He is an Isuzu Master Mechanic I believe, and in this message he described how to replace an intake manifold gasket on the 3.2/3.5 engine.
Please note that I have not tried this procedure, and cannot say if and how well it works. Also, if Sam or anybody else in-the-know wants to add, clarify, or contradict this information, they are welcome to do so. I offer it simply because many of us with Isuzu V6 engines are getting out of warranty now, and may need DIY instructions.
So here it is, paraphrased and edited for clarity (Sam is a better mechanic than writer):
Quote:
--------------------------------------------------------------------------------
Something that has been showing up even more lately on the new V6 engine, the intake gaskets are starting to leak and break. If the gasket is leaking real bad you can hear an air leak from the engine, almost like the airbox is not tight.
Using a can of brake cleaner you can check this very easy. Spray around the intake, most of the time on the drivers side, and you can find the leak.
To repair the leak, here is how it goes:
Remove the air intake hose from the throttle body.
Remove the 4 bolts that hold the throttle body to the intake. No need to remove any other hoses from the throttle body.
Unhook the injector wiring from each injector.
This is the hard part: on the passenger side of the intake you have to remove the EGR flow pipe nut. You will need a 7/8" or 22mm wrench, may even have to cut the wrench short to get it in there.
Remove the 2 long bolts on each side.
Remove the 2 short bolts from each side, I think they are on the front and rear of the intake.
On the Troopers the intake will lift up enough to get the old gaskets out. On the Rodeo use short bungy cords to hold the intake up so that the old gaskets can be removed.
When removing the old gaskets be careful, they may be broken. Do not let the pieces fall into the intake.
Use a clean rag to wipe off the intake surface on the cylinder head and reinstall the new gaskets.
Let the intake back down and start the EGR flow pipe before putting the other bolts in the intake.
Reinstall the other bolts and air intake hose.
This message was from Sam Jelinek, who many of you know from ZuZoo and elsewhere. He is an Isuzu Master Mechanic I believe, and in this message he described how to replace an intake manifold gasket on the 3.2/3.5 engine.
Please note that I have not tried this procedure, and cannot say if and how well it works. Also, if Sam or anybody else in-the-know wants to add, clarify, or contradict this information, they are welcome to do so. I offer it simply because many of us with Isuzu V6 engines are getting out of warranty now, and may need DIY instructions.
So here it is, paraphrased and edited for clarity (Sam is a better mechanic than writer):
Quote:
--------------------------------------------------------------------------------
Something that has been showing up even more lately on the new V6 engine, the intake gaskets are starting to leak and break. If the gasket is leaking real bad you can hear an air leak from the engine, almost like the airbox is not tight.
Using a can of brake cleaner you can check this very easy. Spray around the intake, most of the time on the drivers side, and you can find the leak.
To repair the leak, here is how it goes:
Remove the air intake hose from the throttle body.
Remove the 4 bolts that hold the throttle body to the intake. No need to remove any other hoses from the throttle body.
Unhook the injector wiring from each injector.
This is the hard part: on the passenger side of the intake you have to remove the EGR flow pipe nut. You will need a 7/8" or 22mm wrench, may even have to cut the wrench short to get it in there.
Remove the 2 long bolts on each side.
Remove the 2 short bolts from each side, I think they are on the front and rear of the intake.
On the Troopers the intake will lift up enough to get the old gaskets out. On the Rodeo use short bungy cords to hold the intake up so that the old gaskets can be removed.
When removing the old gaskets be careful, they may be broken. Do not let the pieces fall into the intake.
Use a clean rag to wipe off the intake surface on the cylinder head and reinstall the new gaskets.
Let the intake back down and start the EGR flow pipe before putting the other bolts in the intake.
Reinstall the other bolts and air intake hose.
IdahoRodeo
03-08-2004, 05:43 PM
Amigo-2K and Davejb, thanks again for the replies. I am the second owner so I guess I could have just had Isuzu fix it....to late. I already did it. The IMG at cylinder 4 was cracked in 4 places. Needless to say the Rodeo is behaving like it's old self again. Only one problem left. The check engine light will not clear on a Pending Code P0300.(Multiple misfire on multiple cylinders). Also I am getting a P1311(Isuzu specific powertrain code)? I can read the errors out but as soon as I clear the P0300 it comes back as a pending trouble code. Is there some secret here to clearing this? Thanks again.
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