Spark Plug: Testing and Inspection

On-vehicle Inspection

Spark test
1. Disconnect the ignition coil connectors (A).








2. Remove the ignition coils (A).

Tightening torque :
9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb-ft)








3. Using a spark plug socket, remove the spark plug.
4. Install the spark plug to the ignition coil.
5. Ground the spark plug to the engine.





NOTE:
To prevent fuel being injected from injectors while the engine is being cranked, disconnect the injector connector.
Crank the engine for no more than 5 - 10 seconds.

6. Inspect all the spark plugs.
7. Using a spark plug socket, install the spark plug.

Tightening torque :
24.5 - 29.4 N.m (2.5 - 3.0 kgf.m, 18.1 - 21.7 lb-ft)

8. Install the ignition coil.
9. Reconnect the ignition coil connector.





Inspect Spark Plug
1. Using a spark plug socket, remove the spark plug.

CAUTION:
Be careful that no contaminants enter through the spark plug holes.

2. Inspect the electrodes (A) and ceramic insulator (B).




Inspection Of Electrodes





3. Check the electrode gap (A).

Standard :
1.0 - 1.1 mm (0.0394 - 0.0433 in.)