Spark Plug: Testing and Inspection
SPARK PLUGINSPECTION
1. Disconnect the spark plug cable from the spark plug.
NOTE: Pull on the spark plug cable boot when removing the spark plug cable, not the cable, as it maybe damaged.
2. Using the spark plug wrench, remove all of the spark plugs from the cylinder head.
NOTE: Take care not to allow contaminants to enter through the spark plug holes.
3. Check spark plugs for the following:
1. Broken insulator
2. Worn electrode
3. Carbon deposits
4. Damaged or broken gasket
5. Condition of the porcelain insulator at the tip of the spark plug
4. Check the spark plug gap using a wire gap gauge, and adjust if necessary.
Standard value:
Spark plug gap: 1.0 - 1.1 mm (0.039 - 0.043 in.)
5. Re-insert the spark plug and tighten to the specified torque. If it is over torqued, damage to the threaded portion of cylinder head may result.
Tightening torque
Spark plug: 20 - 30 Nm (200 - 300 kg-cm, 15 - 22 lb-ft)
NOTE: When replacing the spark plug, use the genuine parts which have resistance.
ANALYZING SPARK PLUGS
Engine conditions can be analyzed by examining the tip deposits near the electrode.