Question about 2000 Mercury Grand Marquis
Once in awhile will not fire, turns over good, no sputter so either spark or fuel is missing. Other times runs great.
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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Posted on Jan 02, 2017
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