Question about 2003 Mercury Grand Marquis

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Where are the spark plugs and how do i replace them on an 03 marquis LS

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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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My 1999 mercury grand marquis keeps throwing a plug. Mechanic says if it happens again I need to replace the whole head. Is this true?


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Lots to read about that problem on the internet

It went on from 97 thru 03,some 7 years,then ford
came out with a 3 valve 5.4 v8 that had two piece
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The heads were designed with not enough thread
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You can read for days on just about any vehicle problem
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Where are the spark plugs located on a 2000 Mercury grand Marquis?


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Think it is 0.54 but not positive. It should be listed in the back of your owners manual.

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