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1999 Pontiac Grand Am Question: Overheating and accelerating on its own



soldierboy064, V6, Murphysboro, IL, March 02, 2009, 01:53

Recently my car has been trying to overheat when it has antifreeze in the reservoir. Also it has been trying to accelerate on it's own and when I put it in park or neutral the rpms rev up between 3 and 4 thousand rpms. The throttle is not sticking and the pedal is unobstructed. Where should I begin to try to fix this problem?

2 Answers
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  • Answer #1

    March 04, 2009, 15:47

    You need to put a scanner on this vehicle and see what code comes up, I think autozone still does this.

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  • Answer #2

    April 10, 2009, 17:48

    My '99 does the same thing. Please let me know if you find out what causes it.

    Typically, all I have to do is turn it off and restart it. Most of the time that seems to do the trick.

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  • Reply

    Visitor, December 28, 2010, 15:23

    IAC sensor does it. just replaced mine today and the car doesn't accelerate on its own anymore...

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