Question about 2000 Mercury Grand Marquis

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My car will start but will not idle; what is wrong It starts and will run as long as I press the accelarator. Once I remove my foot from the accelarator it stops running.

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Sounds like the Idle Air Control valve is stuck. The best course of action is to just replace it since they aren't usually repairable. Also check to make sure that all the wires connected to it are not chewed up and have power with the key in run.

The IAC is the cylindrical looking unit on the side of the throttle body with a 2 wire plug on it.

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Posted on Oct 06, 2009

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Try throttle postion sensor

Posted on Oct 10, 2009


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Sorry I spelled engine wrong. Anyway I removed the IAC (idel air controll valve) and cleaned off all the gunk and checked for freedom of movement. Re-installed and car now runs fine . Thanks for the intrest.

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Engine revs up even when parked - Honda Odessey 2002

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