Ignition Cable: Testing and Inspection
SPARK PLUG CABLES TEST1. Disconnect, one at a time each of the spark plug cables while the engine is idling to check whether the engine's running performance changes or not.
CAUTION: Wear rubber gloves while doing so.
2. If the engine performance does not change, check the resistance of the spark plug, and check the spark plug itself.
3. Check the cap and outer shell for cracks.
4. Measure the resistance.
NOTE: Resistance should not be higher than 10,000 Ohm-per foot of cable. IF resistance is higher, replace the cable.
INSPECTION AND CLEANING
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 may be damaged.
2. Using 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 overtorqued, damaged to the threaded portion of cylinder head may result.
Tightening torque
Spark plug 20-30 Nm (204-306 kg.cm, 15-21 lb.ft)
NOTE: When replacing the spark plug, should use the genuine parts having resistance.