Question about 1999 Lincoln Navigator
If you did not change the spark plug at the same time it may be overloading the ignition coil. Also there may be a broken, worn or carbon tracked insulator on the spark plug.
(1) If the gap is worn it makes the coil work harder trying to jump the gap.
(2) If the spark plug insulator is broken it may not be a coil problem at all.
(3) If the porcelain insulator on the spark plug has dirt or carbon on it the spark may be following it on the outside of the plug rather than jumping the gap at the end.
I would recommend you get a pro to change your spark plugs on this engine. They can be a problem to remove and reinstall properly and very expensive to repair if not done correctly.
Posted on Oct 12, 2010
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Posted on Jan 02, 2017
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