Question about 2000 Mercury Grand Marquis
Your Mercury has a bad idle air control valve.
This valve is computer controlled to allow airflow past the throttle plate.
It is stuck and not allowing enough air into the engine at an idle.
Cold starts engines need more airflow.
The valve is mounted on the throttle body and are easy to replace on this car.
Get a new one so you know what it looks like and put it on. It's that easy. Two small bolts hold it on.
It may take a couple of starts to configure itself but it will do it on it;s own.
If you have further questions, please ask me here in a comment.
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Posted on Mar 20, 2011
The idle is computer controlled, the problem is not an adjustment.You probaly have a vacuum leak like the main line goingto brake booster or the EGR system has failed or the tps is faulty.You need to have trouble codes pulled and or a diagnostic run.Dont try to adjust anything or swap parts it will cost you needless money in the end.
Posted on Mar 19, 2011
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Posted on Jan 02, 2017
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