Spark Plug: Testing and Inspection

On-vehicle Inspection

Spark Test
1. Disconnect the battery negative cable.

Tightening torque :
7.8 - 9.8N.m (0.8 - 1.0kgf.m, 5.8 - 7.2lb-ft)

2. Remove the surge tank. (RH only)

3. Remove the LH/RH ignition coil connectors (A) and then, remove the ignition coil.









NOTE:
When removing the ignition coil connector, pull the lock pin(A) and push the clip(B).





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




7. Check if spark occurs while engine is being cranked.

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

8. Inspect all the spark plugs.
9. Using a spark plug socket, install the spark plugs.

Tightening torque :
14.7 - 24.5N.m (1.5 - 2.5kgf.m, 10.8 - 18.1lb-ft)

10. Install the ignition coils.

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

11. Reconnect the ignition coil connector.





Inspect Spark Plug
1. Remove the LH/RH ignition coil connectors (A) and then, remove the ignition coil.









NOTE:
When removing the ignition coil connector, pull the lock pin(A) and push the clip(B).





2. Using a spark plug socket, remove the spark plug.

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

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




Inspection Of Electrodes





4. Check the electrode gap (A).

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