Nasty running when cold, then evens out -- sorta - 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 09-15-2004, 12:48 AM   #1
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Default Nasty running when cold, then evens out -- sorta

Here'* a good one for you all. 92 SSEi. Car has to have the accel pedal held to keep car running when cold. After 30-90 sec, will idle normal. Drive it a little bit, then starts getting temperamental, bogging, starts lugging down, then lurches and takes off like a jet! Doesn't do it all the time -- has bad days and good days. Thought that maybe the o2 sensor wire was picking up RFI (radio frequency interference) off of the plug wires (o2 and wires brand new) but that wasn't it. Any guesses? TPS? MAF? Coolany sensor, maybe baro? Mileage -- 23 mpg last week w/ heavy foot.
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Old 09-15-2004, 12:50 AM   #2
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Use the procedure in Techinfo to extract PCM codes. You don't need a scantool to do this. Let us know what you find.
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Old 09-15-2004, 12:58 AM   #3
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Default Got ya.

Thanks for the quick response.


I looked up the procedure- it'* the standard "paper clip" on the a-b terminal deal. I had the SES light on since I've owned the car, and came up with a cam sensor fault and a "58" VATS fault. There may be more codes. I will check tomorrow during lunch break and tell you my findings.
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Old 09-15-2004, 01:00 AM   #4
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Default Re: Got ya.

Quote:
Originally Posted by DGPMinistry
Thanks for the quick response.


I looked up the procedure- it'* the standard "paper clip" on the a-b terminal deal. I had the SES light on since I've owned the car, and came up with a cam sensor fault and a "58" VATS fault. There may be more codes. I will check tomorrow during lunch break and tell you my findings.
The 58 is a known bug in the 92 PCM. Ignore it. The Cam sensor is the reference for ignition timing and injector pulsing. If the code is still current, you have your problem.

An SES light shouldn't be ignored
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Old 09-15-2004, 10:58 PM   #5
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I have a code 58, which I will ignore

The other code is a 41. According to tech info, that is the cam sensor circuit. I guess the next question is: what does the timing and cam circuit involve? I also get "hiccups" upon acceleration, then outbursts of boost that will snap your head!

I almost think TPS is involved somehow. Would a "41" be triggered by this sensor?
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