strange engine 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 05-20-2003, 08:14 PM   #1
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Default strange engine idle

car: pontiac bonneville, 1996, v6, 105K miles.

While waiting at a stop, I noticed that the RPM slowly started to increase all by itself! 700 to 1000 to 1200 to 1500 to 1700...

At this point I put the car in park and RPM jumped to 2500+. Turned off engine and turned it back on, everything back to normal.

I've also noticed that while slowly going through a parking lot, the car won't idle down but will stay at a "high" RPM (say 2000) - forcing me to stay on the brakes to keep from going too fast. After a bit, things settle down and everything is fine.

No error codes.

Any ideas?
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Old 05-20-2003, 08:24 PM   #2
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Check your TPS (Throttle Position Sensor).
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Old 05-20-2003, 08:31 PM   #3
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Your throttle body or accelerator linkage may be ceasing up because it/they are dirty.
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Old 05-20-2003, 08:36 PM   #4
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TPS(throttle position sensor) uhmm this could be bad and in my experiance the same thing would happen at idol. I would definatly get it checked and if bad replaced.
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Old 05-21-2003, 12:48 AM   #5
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Had the same problem, car would idle high for no reason, I changed the fuel filter and problem went away That may help...
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Old 05-21-2003, 01:31 AM   #6
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I'm weird but... when I start to have fuel problems regardless of whether I know what it is or not I put some Marvels Mystery oil down in the gas and it keeps the fuel system nice and clean (from what I can tell).
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Old 05-21-2003, 04:56 PM   #7
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took to dealer today, they say its the EGR.
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Old 05-21-2003, 05:17 PM   #8
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:P I cant understand why everyone here takes there cars to the dealership, man I wish i had that kinda money. They always want to charge like twice as much as a regular mechanic. Oh and if you go searching for a mechanic always ask them if they charge by the hour or by the book price (dirty rotten suckers).
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