Question about 1990 Mercury Grand Marquis
On top of the engine lies coil packs, maybe 4 of them on your vehicle--you need to unplug them and pull them out of the socket. You will then need a tool that is long enough, about 10 inches long, to unscrew the spark plugs which are located in the holes from which you removed the coil packs.
Posted on Nov 07, 2010
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Posted on Jan 02, 2017
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