Question about Mercury Grand Marquis

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I have a 2003 Grand Marquis. When the weather gets hot, or using the a/c, after you are done driving and shut down the car, then re-start, it dies. It will start up right away, but you have to keep giving it gas if you are rolling to a stop or it dies down again. Does not happen in the winter time. Started several years ago, when under warranty, the said it was a computer upgrade problem, took 15 minutes and it was fixed for a couple of more summers. Now starting again. No longer under warrantly.

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Sounds like a IAC (Idle air control problem). I would just replace this module as it is pretty cheap. Failure of the IAC usually mechanical, so it will not throw a computer code.

Posted on May 21, 2017

  • Speedracer70 May 21, 2017

    Sounds like a IAC (Idle air control problem). I would just replace this module as it is pretty cheap. Failure of the IAC usually mechanical, so it will not throw a computer code.



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SOURCE: My 1989 Mercedes Benz 300E

The inside of the ignition dealer (Delco) must be thoroughly cleaned and all metal parts passed with fine metal wool. Sparkplugs must also be cleaned or renewed. The air inlet-valve is very sensitive. The cylinder and the disc must be carefully cleaned with light metal wool and contact cleaner. The fault is due to the disc remaining stuck in the cylinder, so no idle function and malfunction of the auto-choke system. If this solution does not work, then the vacuum pressure is defective.Hint from a German Mercedes specialist.

Posted on Dec 02, 2008

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SOURCE: gas fumes inside and out side the car when it is hot outside

Try having the area that the hose was disconnected from steamed cleaned, or go to a car wash wash and spray the area. It might help, that is if you already haven't done so.

Posted on May 28, 2009

  • 246 Answers

SOURCE: 2001 Ford windstar stalling problems. After

have your idle speed sensor cleaned,also checkd the air flow sensor located in the air cleaner housing,you best bet is to have it scanned for PCM soft codes(codes that wont turn on the check engine light on)

Posted on Sep 08, 2009

Testimonial: "Thank you, we will check this out when we get back to Florida in October. Thanks again."

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SOURCE: I have a 1997 Mercury Grand Marquis. The hotwater

Check your antifreeze with a antifreeze checker to make sure it is at the right temp depending on where you live and how cold it gets there. If you have too much antifreeze the engine temp will not come up to over 200 and also replace your thermostat, making sure to realize they make them in different temp settings. Talk to people and make sure the thermostat you install is the right one for your climate where you live. Sounds to me as though your temp never comes up to what it should be. Also it could be the heater core.

Posted on Apr 06, 2010

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