ENGINE ROCKING AT WARM IDLE SPEED

1999 Pontiac Grand Am

Tiny

DennyL12

August, 16, 2014 AT 8:35 AM

When the engine is cold the idle is 1000 rpm and the engine runs fine but when it warms up it drops down to 500 rpm and the engine rocks like it has a misfire.

FOUND 11936 RELATED QUESTIONS

3 Answers

Tiny

hmac300

August, 16, 2014 AT 10:04 AM

Clean throttle plate on both sides and iaac hole with choke cleaner then check for a vacuum leak

Tiny

DennyL12

August, 16, 2014 AT 1:27 PM

I already cleaned the throttle body and replaced the IAC valve. I also checked for vaccum leaks but it still was rattling an shaking a lot to the point where I could see it but the car is not throwing any codes.

Tiny

hmac300

August, 16, 2014 AT 3:28 PM

Usually it will throw a misfire code if it's that bad. Check fuel pressure then do compression test

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