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Why is it that my toyota corolla xe 1994 model always change rpm during idling

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This is not always the case, but a lot of times either a vacuum line has slipped off or is cracked or you have an intake manifold leak. Also take a good look at the air filter (completely remove it for inspection) If dirty replace it. Check the boot that goes from the air filter assembly to the throttle body and make sure it is not cracked. Your egr valve could be stuck open. An inexpensive scan tool could possibly help find the problem if running rough enough to trigger a trouble code. Good luck.

Posted on Jul 16, 2010


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