Mustang V8-4.6L SOHC VIN X (2003)
Spark Plug: Service and Repair
REMOVAL
1. Remove the ignition coil on plug.
2. Remove the spark plugs
NOTE:
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Use compressed air to remove any foreign material from the spark plug well before removing the spark plugs.
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If an original spark plug is used, make sure it is installed in the same cylinder from which it was taken. New spark plugs can used in any
cylinder.
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One spark plug is shown; others are similar.
3. Inspect for gap bridged.
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This can be identified by a deposit build up closing the gap between electrodes.
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This can be caused by oil or carbon fouling.
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Clean the spark plug.
4. Inspect for oil fouling.
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This can be identified by wet black deposits on the insulator shell bore electrodes.
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This can be caused by excessive oil entering the combustion chamber through worn rings and pistons, excessive clearance between valve
guides and stems, or worn or loose bearings. Correct the oil problem.
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Install a new spark plug.
