Explorer 2WD V8-302 5.0L VIN P SFI (1999)
NOTE
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Use compressed air to remove any debris from the spark plug well before removing the spark plugs.
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If an original spark plug is reused, make sure it is installed in the same cylinder it was taken from. New spark plugs can be used in any
cylinder.
4. Inspect the spark plugs for bridged gap.
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Check for deposit build-up closing the gap between the electrodes. Deposits are caused by oil or carbon fouling.
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Clean the plug.
5. Inspect for oil fouling.
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Check for wet, black deposits on the insulation shell bore electrodes. Caused by excessive oil entering the combustion chamber through worn
rings and pistons, excessive valve-to-guide clearance, or worn or loose bearings.
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Correct oil leak concern.
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Install a new spark plug.
6. Inspect for carbon fouling, identified by dry, black, fluffy carbon deposits on the insulator tips, exposed shell surfaces and electrodes. Caused by a
spark plug with an incorrect heat range, dirty air cleaner, too rich a fuel mixture or excessive idling.
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Clean the spark plug.
