## Ignition System

#### Spark Plug Inspection

4-17

1. Inspect the electrodes and ceramic insulator.

Burned or worn electrodes may be caused by:

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

Fouled plug 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
- Clogged air cleaner element
- Deteriorated ignition coils

1. Worn or deformed electrodes
2. Damaged gasket
3. Cranked Insulator
4. Improper gap

   Oil-fouling

   Carbon deposits

   Cranked centre electrode insulator

1. Do not adjust the gap of platinum tip plugs (A); replace the spark plug if the gap is out of specification.

Electrode Gap:

Standard (New):1.0 - 1.1 mm (0.039 - 0.043 in.)

Service Limit:1.3 mm (0.05 in.)

3. Replace the plug at the specified interval, or if the centre electrode is rounded (A). Use only the spark plugs listed below.

Spark Plugs:

Engine Type | Spark Plug Type
D17A2, D17A8, D17A9 | ZFR6J-11 (NGK) ZFR7J-11 (NGK) KJ20CR-L11 (DENSO)
D17A5 | BKR6E-N-11 (NGK) BKR7E-N-11 (NGK) K20PR-L11 (DENSO)

4. Apply a small quantity of anti-seize compound to the plug threads and screw the plugs into the cylinder head finger-tight. Then torque them to 18 Nm (1.8 kgf/m, 13 lbf/ft).