help!!! P0171 never ending battle - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-21-2008, 05:08 PM   #21
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The exhaust system from the O2 sensor back won't have any effect. I guess you could say we have it narrowed down to the area between the MAF sensor & O2 sensor.

With the car running, remove the oil filler from the front valve cover. What happens to the idle? Now put the palm of your hand over the hole. Is it drawing air in or blowing air out?
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Old 04-23-2008, 12:05 AM   #22
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tech ted i have a vacuum at the oil fill neck but lately with the warmer temps around 60-70 degrees fahrenhiet here that my water temp has been raising towards the 240 mark even with my fan bypass i have to turn the fans on and rev the motor before the temps drop my car is terrible in stop go city traffic and even with my 180 thermostat its hovering around 200 cruzing down the interstate, and on top of that when i tested my vacuum with a actron vacuum/boost gauge at the little tree where the line goes from the supercharger housing to fuel pressure regulator it was a steady reading around -10 to -12PSI cant remember exact measurement. but looking at my boost guage it is bouncy at idle in park and bounce from pegged -10 vacuum to -8 vacuum and flutters there in that situation and at idle i also notice a irradic idle and its not very consistent at least according to me its not a consistent lope in idle like a missfire shows so maybe it is as simple as a leak somewhere i swore i sparyed everywhere but maybe i should check again???
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Old 04-23-2008, 03:57 PM   #23
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now if i notice the oil filler neck blowing air out that would mean a blown head gasket correct?
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Old 04-23-2008, 05:36 PM   #24
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I was thinking more of excessive blow by past the rings. Sooo - is it blowing or sucking? Either way check the PCV valve if you haven't already.

Another thing you can try is disconnecting the wiring harness from the EVAP purge solenoid. That'll rule out a leak in the evap canister or lines to it.

Did you see my thread on P0171 -
http://www.bonnevilleclub.com/forum/...ic.php?t=97444

In the video I'm using carb cleaner but earlier used CRC MAF Sensor Cleaner. The CRC actually seemed to work better, it affected the idle while being farther away from the leak than the carb cleaner. Both are flammable so you should really have a fire extinguisher handy.
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Old 04-24-2008, 02:11 PM   #25
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!!! update !!!
i have the factory (guttted) air box on and the MAF screen on. i installed new NGK TR55s at factory spec. gap. i have interchanged ac delco and bosch O2 sensors "bosch seems to be the easiest O2 to find" both read the same. i have sprayed just about every solvent out there on the upper intake and cant find any issues at all in terms of leaks i checked the grounds at the ICM, Block cyl. #2, the half dozen fender grounds, and the battery terminals. i cant find what is wrong did i over look something should i just start replacing parts according to the hanes manual its as easy as a vacuum leak and as difficult as a timing chain and cam. if my thoughts are right the fuel pressure was around 47psi engine running at idle should i think about a fuel pump being an issue i replace the filter not long ago bout 6 months. PCV i just replaced last week.

so please anyone with any thoughts on this please chime in as ridulous as you think they might sound i'm all ears at this point i will try anything to fix this issue
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Old 04-24-2008, 03:35 PM   #26
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Did you try unplugging the wiring harness to the EVAP purge solenoid?

If that doesn't/didn't help then post what the fuel trims are at idle, 2000 & 2500 rpm. All while in park.
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Old 04-24-2008, 04:14 PM   #27
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ok ill get back to you on those
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Old 04-25-2008, 01:32 AM   #28
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if i remember correctly the evap purge is mounted on top of the charcoal canister and for one reason or another it has no plugs what so ever
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Old 04-25-2008, 01:42 AM   #29
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Hopefully I don't have them mixed up. The vent solenoid is on the canister & the purge is on the motor. They both should have a wiring harness going to them. Just follow the smaller line from the canister up to the purge solenoid.
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Old 04-28-2008, 12:46 AM   #30
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nope no effect unplugging the evap purge
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