Spark Plug: Testing and Inspection

Spark Plug Inspection




1. Inspect the electrodes and the ceramic insulator.
- Burned or worn electrodes may be caused by:
- Advanced ignition timing
- Loose spark plug
- Plug heat range too hot
- Insufficient cooling
- Fouled plugs may be caused by:
- Retarded ignition timing
- Oil in combustion chamber
- Incorrect spark plug gap
- Plug heat range too cold
- Excessive idling/low speed running
- logged air cleaner element
- Deteriorated ignition coils

2. If the spark plug electrode is dirty or contaminated, clean the electrode with a plug cleaner.

NOTE:
- Do not use a wire brush or scrape the iridium electrode since this will damage the electrode.
- Use a chemical cleaner such as Carb Spray to clean the contamination on the electrode.
- When using a sand blaster spark plug cleaner, do not clean for more than 20 seconds to avoid damaging the electrode.




3. Replace the plug at the specified interval, if the center electrode is rounded (A), or if the spark plug gap is out of specification. Use only the listed spark plugs.

NOTE: Do not adjust the gap (B) of iridium tip plugs.

4. Apply a small amount of anti-seize compound to the plug threads, and screw the plugs into the cylinder head, finger-tight Then torque them to 25 N.m (2.5 kgf.cm, 18 lbf.ft). If you replaced the spark plugs as directed by the maintenance mender requirement, reset the maintenance mender. If the maintenance mender did not require you to replace the spark plugs, but you replaced the spark plugs, go to step 5.
5. Connect the HDS to the data link connector (DLC).
6. Turn the ignition switch ON (II).
7. Select BODY ELECTRICAL with the HDS.
8. Select ADJUSTMENT in the GAUGES MENU with the HDS.
9. Select RESET in the MAINTENANCE MINDER with the HDS.
10. Select MAINTENANCE SUB ITEM 4 RESET with the HDS.