Mustang V8-4.6L SOHC VIN X (2003)
5. 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.
6. Inspect for normal burning.
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This can be identified by light tan or gray deposits on the firing tip.
7. Inspect for pre-ignition.
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This can be identified by melted electrodes and possibly a blistered insulator. Metallic deposits on insulator indicate engine damage.
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Install a new spark plug.
8. Inspect for overheating.
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This can be identified by a white or light gray insulator with small black or gray brown spots and with bluish-burnt appearance of the
electrodes.
