Question about 2003 Mercury Grand Marquis
They are under the coils just above the valve covers. There are 8 coils, one for each plug. I suggest not using anti-seize on the threads, but you must use di-electric grease on the boots to prevent cross-fire. the Motorcraft plugs are good for 100,000 miles, and seem to work very well. be careful, there are not a lot of threads on the head (even fewer on 99-back) so don't over tighten them.
Posted on Sep 02, 2010
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Posted on Jan 02, 2017
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