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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YOU COULD HAVE A BAD INJECTOR , OR A BAD ENGINE POSITION SENSOR. IT COULD ALSO BE OUT OF TIME .

Posted on Sep 08, 2009

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Assuming that you mean P0301, that is a cylinder misfire code that is identifying number 3 cylinder as the cylinder with the misfire problem. MANY things can cause a cylinder to misfire including spark plugs, spark plug wires or boots, burnt valves, broken valve springs, blow head gaskets, cracked cylinder heads, bad or dirty injectors, faulty injector control circuits, Failed ignition coils...the list goes on....proper diagnosis required.

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1997 Mercury mountaineer. 143,000 miles. Running rough with the service engine light on and when driving down the highway it cuts out and the engine light flashes.


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.
Spark plugs, ignition coil, fuel injectors or internal engine problems will cause this.
If it has been a while since your last tune up it would certainly be a very good place to begin.
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.
Thank you for using FixYa.

KL

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Hi ,
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