Question about 2001 Chevrolet Impala

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I have a problem with my 2004 IMPALA. The problem has occurred 2 or 3 times during the past couple of months and is not something that I can replicate at will. I was stopped at a Traffic Light, with transmission in “D”, airconditioning running, and my foot on the brake. Suddenly, the engine revved up and the car tried to lurch forward. The only way to stop the car was to take the foot off the brake pedal, and re-apply the brake. My local mechanic does not know what the problem could be and he could not replicate the situation. Can you help? THANKS. Bob

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  • boblva Jul 25, 2008

    Thank you for your response. I will pass it along to the mechanic and see what happens. I will keep you informed. Thanks for your help.




3 Answers

HI, clean the idle air control valve
that might just fix it

Posted on Aug 04, 2008

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Hi, i suggest you have him test the one way valve on ure brake booster vacuum line as it might not seal/opperate correctly.

Posted on Jul 23, 2008

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I think you will find either the throttle position sesor or idle speeed control valve are at fault, niether will set a fault code, the engine computer just thinks the throttle has been opened and adds fuel, the idle speed control valve can stick at times and cause this this condition, wiring issues may be at fault as well, but this is fairly rare. I would suggest you tap on the TPS with a hammer handle and see it the engine speed changes, also clean the intake with carb spray with the engine running at high idle, hold the throttle valve slightly useing a feeler guage or match book cover, you may call if you like, Dennis 925-459-0571

Posted on Jul 23, 2008

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