Navigator 4WD V8-5.4L DOHC VIN R (2001)
Spark Plug: Service and Repair
REMOVAL
1. Remove the ignition coil.
2. Remove the spark plugs.
NOTE: Remove any foreign material from the spark plug wells with compressed air before removing the spark plugs.
3. Inspect the spark plugs for a 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 spark plug.
4. Check for oil fouling.
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Check for wet, black deposits on the insulator 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 the oil leak concern.
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Install a new spark plug.
