Question about 2001 Mercury Grand Marquis

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2001 4.6L mercury engine misfire. Plugs and boots have been replaced, but still have problem. What are possible causes. Engine has 70,000 miles.

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  • Bruce Hathcock May 11, 2010

    Does it have the throttle body injection or individual fuel injection? If it has injectors for each cylinder then you may have a defective injector. I would like to know if it does it all the time or on deceleration or when under power, have you done a top engine clean? A top engine clean may sound silly but will remove carbon build up and stop pre ignition from high compression making it seem to miss, it will also not allow the knock sensor to adjust the timing to keep it from pinging. So with more information I could help you find the cause.


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Posted on Sep 08, 2009

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Hello Sdhesseltine.

The flashing check engine light is telling you the engine is misfiring and your description of the problem confirms that.
There will be a code stored in the vehicles engine computer that will tell you which cylinder(s) is/are misfiring.
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The usual tune up stuff, spark plugs, air and fuel filters for the basics.
A fuel filter will not be at fault in this case but is part of a tune up on this model.

If you require further advise, please ask me here in comments, be glad to help.
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