Mustang Cobra V8-4.6L DOHC VIN V (2000)
5. 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 may 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.
6. Inspect for carbon fouling.
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This can be identified by black, dry fluffy carbon deposits on insulator tips, exposed shell surfaces and electrodes.
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This may be caused by too cold a plug, dirty air cleaner, damaged fuel pump, too rich a fuel mixture or excessive idling.
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Clean the spark plug.
7. Inspect for normal burning.
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This can be identified by light tan or gray deposits on the firing tip.
8. Inspect for pre-ignition.
