Mustang V6-3.9L VIN 6 (2004)
Spark Plug: Service and Repair
SPARK PLUGS
Remover, Spark Plug Wire
SPECIAL TOOL(S)
REMOVAL
CAUTION:
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It is important to twist the spark plug wire boots while pulling upward to avoid possible damage to the spark plug wire.
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Spark plug wires must be connected to the correct ignition coil terminal. Mark spark plug wire locations before removing them.
1. Remove the air cleaner outlet pipe.
2. Using the special tool, remove the spark plug wires from the spark plugs using a twisting motion.
3. 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 reused, make sure it is installed in the same cylinder from which it was taken. New spark plugs can be used in any
cylinder.
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Left side shown, right side similar.
Remove the spark plugs.
4. Inspect for gap bridged.
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This can be identified by deposit build up closing the gap between electrodes.
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This may be caused by oil or carbon fouling.
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Clean the spark plug.
