Question about 1999 Lincoln Navigator

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I have a 2000 navigator and the check engine lght came on so brought it in test said 8th spark plug was mis fire and need to change coil also so had it changed all was well for half the ride home then light came back on so on good faith the place changed it again was good for couple days this time lights back on why this keep misfire blowing coil

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Hello epereira.
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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