Question about 2000 Mercury Grand Marquis

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Sometimes will not start

Once in awhile will not fire, turns over good, no sputter so either spark or fuel is missing. Other times runs great.

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  • Albert Williams
    Albert Williams May 05, 2015

    Thanks for all suggestions, But so far the problem as not returned. I now have good idea what to test when it does. I did get another suggest that it could be the cam sensor. But until it happens again I will have to wait..

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You can buy a spark tester at Auto Zone for little money. Put it in between the spark plug and the plug wire. Then have someone turn the engine over and watch to see of there is a spark in the tester. You can do this test for every plug.
If none of the plugs spark, then the problem is no spark and it could be coils or other. Rent a code checker, Auto Zone rents it for free, you only have to leave the cost for a deposit, but get it back when you return it. This should tell you the possible problems.
If some plugs spark and some don't, the plugs may need to be replaced. They should be replaced every 100,000 miles.

Posted on Apr 15, 2015

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