Spark Plug: Testing and Inspection

INSPECTION
Check the following points. If a problem is found, replace the spark plug.
^ Damaged insulation
^ Worn electrodes
^ Carbon deposits
If cleaning is necessary, use a plug cleaner or a wire brush. Clean the upper insulator, also.
^ Damaged gasket
^ Burnt

Plug gap
Refer to the Vehicle Emission Control Information (VECI) decal, located in the engine compartment for spark plug gap.