93 Old's Random Idle - 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 02-26-2008, 08:41 PM   #1
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Default 93 Old'* Random Idle

Well now im at a loss. my car for the past 2 months has been randomly idling high, i haved replaced the TPS and the MAF LIM and the UIM and it still has a high idle the i replaced the IAC 2 years ago and it seems to be working, i only say this because the car is not at a constant high idle it will come back down after a few seconds or minutes... My friends thinks it has somthing to do with the 160 tstat i put in my car about a year ago he said it might be kicking into open loop or also the EGR could be getting stuck open..
i was wondering if anyone had any ideas?
i was thinking bad TPS or a bad PCM
the tps i bought was a non adjustable from autozone and im sure it was a cardoom so im gonna have to test it the hard way being no scanner will read my car but the paperclip and flashing codes still works
oh and i dont have any codes saved if that helps..
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Old 02-27-2008, 09:11 PM   #2
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How long since the throttle body has been cleaned? Maybe the throttle plate is gunked up and occasionally sticking open? Some other things to check include: vacuum leaks, PCM ground, fuel in FPR hose, PCV valve.
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Old 02-27-2008, 10:07 PM   #3
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does it do it when the car is at normal operating temp. or just at start-up?
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Old 02-27-2008, 11:09 PM   #4
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normal op temp
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Old 02-28-2008, 06:24 PM   #5
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Quote:
Originally Posted by acidcrashdburnd
normal op temp
if thats the case, i would suggest as bill has, to clean the throttle body and sensors.
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Old 02-28-2008, 07:43 PM   #6
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Get a new TB gasket (may be dealer only for you), and follow the TB/MAF cleaning Techinfo article.
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Old 03-01-2008, 09:56 PM   #7
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Quote:
Originally Posted by bill buttermore
How long since the throttle body has been cleaned? Maybe the throttle plate is gunked up and occasionally sticking open? Some other things to check include: vacuum leaks, PCM ground, fuel in FPR hose, PCV valve.
i parts washed my TB last time it was off which was 2 months ago
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Old 03-01-2008, 10:05 PM   #8
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what did you use to clean the MAF?
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Old 03-02-2008, 01:07 AM   #9
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Quote:
Originally Posted by samueljackson
what did you use to clean the MAF?
TB cleaner then it was making it throw codes so then i cleaned it with brake cleaner
btw my abs quit working today i love my 93 money pit
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Old 03-02-2008, 11:17 AM   #10
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Quote:
Originally Posted by acidcrashdburnd
Quote:
Originally Posted by samueljackson
what did you use to clean the MAF?
TB cleaner then it was making it throw codes so then i cleaned it with brake cleaner
btw my abs quit working today i love my 93 money pit
thats your problem, you NEVER want to use something that aggressive on the maf. i have a couple extras that should work for you. can you post your oe # stamped on the part.
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