## Ignition System

#### Spark Plug Inspection

4-22

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. Cracked insulator
2. Damaged gasket
3. Worn or deformed electrodes

- Improper gap
- Oil-fouling
- Carbon deposits
- Cracked 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.)

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
D14Z6, D16V1 | ZFR5J-11 (NGK) ZFR6J-11 (NGK) KJ16CR-L11 (DENSO) KJ20CR-L11 (DENSO)
D16V3 | BKR5E-11 (NGK) BKR6E-11 (NGK) K16PR-U11 (DENSO) K20PR-U11 (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).