1995 Bonneville SSEi Supercharged, Irratic idle - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

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Old 11-09-2011, 10:00 AM   #1
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Default 1995 Bonneville SSEi Supercharged, Irratic idle

The car warm or cold will not idle at one speed. When i first start it cold it will idle up to around 1800rpm'* or so and then when it should drop to normal idle speed of about 1000rpm'* it keeps going down and almost stalls and then it will idle up again and down again and never stays at the same rpm'*. Once it is warm I can stop for a light and the idle will drop to about 800rpm'* or so and almost stall. When I stop for a light the idle does not race it just drops. It may not race because I have it in drive.
I have recently replaced MAF, Ignition control module, plugs, wires, 02 sensor, coil packs, IAC valve and about two years ago the EGR valve.
I was having vacuum leak issues with the EGR tube, but I believe they are taken care of.
When the idle drops you can smell it chocking out, runs rich.
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Old 11-11-2011, 12:02 AM   #2
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When I had these problems it was my egr valve. I know you said you replaced it, but might be worth checking for a clog or other similar issue. Check for vacuum leaks also. Spray some TB cleaner around your lines and see if it affects your idle.

Have you checked fuel filter / fuel pressure? I don't think this would be the cause, but never hurts to check
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Old 11-11-2011, 10:34 AM   #3
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Check for vaccum leaks.Pull your IAC and clean it..and maybe even test your MAf senso
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