The condition of the spark plug determines the high voltage level and is the single most important component in the ignition system. The size of the electrode gap, condition of the electrodes, and the amount of deposits on the electrodes all affect the life of the spark plug. The electrodes of the spark plug are made from platinum which will minimize electrode wear.
Replace the spark plug with a new one if the electrode wear and amount of deposits are excessive. Otherwise the spark plug can be regapped to 0.015 in.
Removal of Spark Plug
Remove the spark plug from the cylinder head as follows: