Question about 1991 Pontiac Grand Am

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It idlles at a high speed. dont even have to touch the gas pedal. what is wrong with it.

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Vacuum leak or mis adjusted TPS.or IAC valve stuck.

Posted on Mar 28, 2011

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1 Answer

High idle when just touching gas pedal


Spark plugs have problems replace genuine accessories. If you can confirm that the spark plug is genuine, you can try to change high-voltage ignition coil

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Idles to high to the point i dont have to touch the gas to drive...i can go 45 mph without touching the gas pedal


If you know for a fact the throttle plate is closed, and there are no vac leaks, the only thing left is the idle air control valve on the side of the throttle body. It may be stuck open.
The computer controls idle speed by how much air enters the intake thru the control valve.

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that is a possibility. is this a guarantee to fix? if he has done the proper diagnostics and he is guarantee the repair then this would be logical. but no fix no pay. dont let it turn into something else and something else. hope this helps

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I have a 93 honda del sol manual when the car has been turned on it accelerates by itself and it has a check engine light dont now what is wrong with it


You probably have a bad Idle Air Control Valve (IACV). In fuel injected carburetors when the throttle valve is closed the IACV opens and closes to control the idle speed. If it malfunctions the engine may rev up allowing the car if in gear to accelerate on its own . When I had a bad IACV in my Mitsubishi Lancer it would drive down the road at 50 mph with out touching the gas pedal. Fortunately, it could be slowed down by using the brakes (unlike the Toyota stories).

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Sluggish acceleration. High RPM, High Oil Pressure


I hope I'm wrong but I think your torque converter is failing. Sorry, Gary

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Erratic idle/stalling


the erratic idlling is probably caused by your TPS.

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Throttle position sensor. It's under recall for most Malibu models.

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