Spark Plug: Testing and Inspection

Spark Plug Inspection

Removal

1. Ignition Coil Cover





1. Remove the ignition coil cover.

2. Ignition Coil





1. Remove the ignition coils.

3. Spark Plug





1. Remove the spark plugs.

Inspection

1. Spark Plug - Inspection





1. Inspect the electrodes and the ceramic insulator.

* Burned or worn electrodes may be caused by these conditions:

- Advanced ignition timing
- Loose spark plug
- Plug heat range too hot
- Insufficient cooling

* Fouled plugs may be caused by these conditions:

- Retarded ignition timing
- Oil in combustion chamber
- Incorrect spark plug gap
- Plug heat range too cold
- Excessive idling/low speed running
- Clogged air cleaner element
- Deteriorated ignition coils

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

NOTE:
* Do not adjust the gap of iridium tip plugs.
* Do not use a plug cleaner.











Installation

1. Spark Plug





1. Apply a small amount of anti-seize compound to the plug threads, and screw the plugs into the cylinder head, finger tight, then tighten the plugs to the specified torque.








2. Ignition Coil





1. Install the ignition coils.

3. Ignition Coil Cover





1. Install the ignition coil cover.