B4000 4WD V6-4.0L OHV (1995)
Spark Plug: Testing and Inspection
INSPECTION
Check the following points. If a problem is found, replace the spark plug.
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Damaged insulation
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Worn electrodes
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Carbon deposits
If cleaning is necessary, use a plug cleaner or a wire brush. Clean the upper insulator, also.
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Damaged gasket
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Burnt
Plug gap
Refer to the Vehicle Emission Control Information (VECI) decal, located in the engine compartment for spark plug gap.