Question about 2000 Mercury Grand Marquis

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My Grand Marquis sometimes will not start after it has been driven for a while. During the drive all indications are normal. The engine will turn over, but it will not start like there is no fuel introduced into the injectors. I've checked the injectors when the car is running and they are getting fuel and the fuel pump is functioning properly. The dealership has run a diagnostic check and found nothing. Could the chip within the key be going bad or loosing a code and cause this problem causing the engine anti theft feature to not work? After sitting for a while, the car will start again with no issues and drive perfectly.

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  • kenrictw May 17, 2010

    The ICV has been replaced because prior to this problem there was a loud humming noise.

  • kenrictw May 23, 2010

    The security module works as advertised.

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Yes the key could be a problem BUT your theft light would be flashing on the dash while you are trying to start

since you have fuel during the concern I am going to assume that you are missing spark?

if no spark you could be dealing with a bad CKP (crank shaft position) sensor

watch your MIL (malfunction indicator lamp) also known as the check engine light WHILE cranking

if the light is ON while cranking then your computer is not seeking the CKP

if the light is OFF while cranking then we can skip the CKP issue

Posted on May 23, 2010

  • kenrictw May 25, 2010

    Thanks for all the help, but I haven't had any issues with this isue in a while. I'm not sure what happened, but everything works as advertised. I have changed the key, but even the old key is working as advertised as well. Thanks for all your help. I will be sure to come back for all you all's help in the future if any issues arises.

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  • Master
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The security module is constantly on and never off. It may be getting weak shorting out at times. A diode that flashes every ten seconds when the car is off can be seen. Watch the flashes when you can every hour or so and time the flashes. Moybe the diode will not flash at all at times you look. If so the security Module needs to be replaced

Posted on May 17, 2010

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  • Mercury Master
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It sounds like the problem is very likely the IAC valve. It will cause problems exactly like this and won't show a DTC on a scan.

The valve pintle gets carbon deposits and a little engine oil on it that when it gets hot, like after being driven, gets sticky. Then when the valve needs to open at idle to provide air, it can't...until it cools down and isn't so sticky anymore.
The valve is mounted in the throttle body, and only just needs to be removed and cleaned. A throttle body cleaner or isopropyl alcohol and tooth brush will work. Also clean the mounting hole that the pintle will go into.

Posted on May 13, 2010

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