Cougar/XR7 V8-4.6L VIN W (1997)
4. Normal
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Identified by light tan or gray deposits on the firing tip.
5. Carbon Fouled
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Identified by black, dry fluffy carbon deposits on insulator tips, exposed shell surfaces and electrodes.
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Caused by too cold a plug, dirty air cleaner, damaged fuel pump, too rich a fuel mixture or excessive idling. Clean the spark plug.
6. Fused Spot Deposit
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Identified by melted or spotty deposits resembling bubbles or blisters.
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Caused by sudden acceleration. Clean the spark plug.
7. Overheating
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Identified by a white or light gray insulator with small black or gray/brown spots and with bluish-burnt appearance of electrodes.
