Procedure

Spark Plug Inspection and Replacement

1. Remove the spark plugs to inspect. 2. Inspect the spark plug electrode for wear and the insulator for roughness, cracks, breaks, or blistering. Also check that precious metal is visible on the spark plug electrode. 3. Replace the spark plug if the electrode is worn; the insulator is rough, cracked, broken, or blistered; or if the precious metal is not visible on the spark plug electrode. WARNING: The color of the plug may not accurately reflect its condition. To accurately diagnose a faulty plug, inspect the precious metal on the plug's electrode. If no precious metal is visible, replace the plug. 4. Set the spark plug gap. Refer to Specifications.