F 250 2WD LD Pickup V8-4.6L SOHC VIN 6 (1997)
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Deposits bridging spark plug gap (A).
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Wet black deposits (oil fouling) (B).
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Dry black deposits (carbon fouling) (C).
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Overheating (D).
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Deposits fused on spark plug (E).
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Pre-ignition damage (F).
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Normal spark plug (G).
INSTALLATION
NOTE: If an original spark plug is reused, make sure it is placed in the same cylinder it was taken from. Replacement spark plugs can be used in any
cylinder.
1. Apply Silicone Dielectric Compound D7AZ-19A331-A or equivalent meeting Ford specification ESE-M1C171-A to inside of spark plug wire
boots.
2. Adjust the spark plug gap as required.
