Spark Plug: Adjustments

Spark Plug Gap:

1. Disconnect spark plug cable from the spark plug. If the spark plug cable is removed by pulling on the cable, it may be damaged.
2. Using a plug wrench, remove all plugs from cylinder head.

Caution: Use care not to allow foreign matter to enter through plug holes.

3. Check the spark plugs for the following:
Broken insulator
Worn electrode
Carbon deposits
Damaged or broken gasket
Burnt condition of porcelain insulator at spark gap.

Note: Dark deposits indicate too rich a fuel mixture, light (white) deposits indicate too lean a fuel mixture, advanced ignition timing or insufficient plug tightening

4. Check plug gap using a plug gap gauge and adjust if necessary.

NON-TURBO

Standard value: .039 - .043 in (1.0 - 1.1 mm)

TURBO

Standard value: .028 - .031 in (0.7 - 0.8 mm)

5. Tighten spark plug to specified torque. If overtorqueing occurs, damage to threaded portion of cylinder head might result.
Spark plug torque: 15-21 ft lb (20 - 30Nm)