Question about 2000 Mercury Grand Marquis

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2000 Mercury Grand Marquis

The engine starts to skip at 40mph? Had a diagnostic test done, found one spark plug that neede replacing, but problem return that?

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  • revdeb95 Dec 19, 2008

    Yes, the new spark plug change how it ran for a while? And the same problem returned a few days later.

  • revdeb95 Dec 19, 2008

    I also forgot to mention that the spark plug had moisture on it?

  • revdeb95 Dec 19, 2008

    motor1258, I responded by saying, that when the spark plug was changed my car ran well for a while, but then the same problem returned a few days later? i also forgot to mention that the spark plug had some moiture on it?

  • Mike Butler
    Mike Butler May 11, 2010

    Moisture as in oil, or unburned fuel? Did he not change plug wire also?

  • Mike Butler
    Mike Butler May 11, 2010

    Did the new spark plug change how it ran for a while at least? Was old plug just carbon fouled or did it have signs of oil on it?


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If the moisture was on the outside of the plug most likely water got into the hole. this causes high stress on the coil and causes them to break down. If the plug was replaced and the symptom returned
i would replace the coil.

Posted on Dec 21, 2008

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