Spark Plug: Testing and Inspection

On-vehicle Inspection

Spark Test

1. Disconnect the ignition coil connectors (A).




2. Remove the ignition coils (A).




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.




6. 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 injector connector.
Crank the engine for no more than 5 - 10 seconds.

7. Inspect all the spark plugs.
8. Using a spark plug socket, install the spark plug.
9. Install the ignition coil.
10. Reconnect the ignition coil connector.






Inspect Spark Plug

1. Disconnect the ignition coil connectors (A).




2. Remove the ignition coils (A).




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

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

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






Inspection Of Electrodes





5. Check the electrode gap (A).

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