I have a 2002 expedition, all spark plugs were replaced 2 weeks ago,engine light came on again #5 has oil on it and also on the coil.Anyone know what it could be?

Asked by Oct 24, 2015 at 05:13 PM about the 2002 Ford Expedition XLT

Question type: General

1 Answer

7,470

If the plug had oil on the electrode chances are you have lost compression in that cylinder or you may have a bad valve seal. Do a compression check to ensure all cylinders are within 15-20lbs of each other ... low compression can be valves or piston rings ... if compression is OK then oil may be coming from a bad seal ... the oil will foul the plug and it won't fire

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