Question about 2003 Mercury Grand Marquis
These coils usually fail because the oil sel around the plug lets oil wick up the plug and shorts the coil. If you find an oily plug they you most likely have found the bad coil.
You can have the dealer hook up their diagnostic machine and they can tell which cyl it is.
Posted on Oct 14, 2010
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Posted on Jan 02, 2017
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