Question about 2000 Mercury Grand Marquis

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I need to know where the idle screw is at? Everytime i start car for first time i have to keep it accerlerated in oreder to stay on, after about 30-60 sec. the car will stay on. Also when i turn on the a/c i loose a lot of power in the car and the ideling droppes.

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  • 1,168 Answers

Hello Victor
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.
Thank you for using FixYa.
KL

Posted on Mar 20, 2011

  • 1 more comment 
  • FUBAR Mar 20, 2011

    Victor..... Vacuum leaks will cause a high erratic idle....Also, a defective idle control valve does not set a code on your Mercury..

  • FUBAR Mar 21, 2011

    Thank you kindly for the rating.
    It is appreciated.
    KL

  • bobbyayo13ba May 18, 2012

    Correct IACV is faulty. Pull any dtc's and you can even test component is scan tool functions. Also check for B and gnd signal. 12 volts. And signal wire from ecm this is a duty signal from ecm fror valve operation. PrIor post covered it all. Vacuum leaks is your gremlin. Kill him

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  • Master
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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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