Spark Plug: Service and Repair

NOTE:
^ The recommended change interval for the platinum tip spark plugs is 100000 miles. If a spark plug is removed from the engine and there is no malfunction associated with the plug, reinstall the old plug in the engine.
^ This engine has aluminum cylinder heads. Do not remove the spark plugs from a hot engine, allow it to cool first. Removing the spark plugs from a hot engine may cause spark plug thread damage or cylinder head damage.

REMOVAL PROCEDURE
1. Turn OFF the ignition.
2. Remove debris from the area around the spark plug holes.

NOTE: Pull on the spark plug boot, the heat shield or use an approved spark plug boot removal tool, twisting a half-turn to release the seal while removing. Do not pull on the spark plug wire or it may be damaged.

3. Disconnect the spark plug wires.
4. Remove the spark plugs using a spark plug socket.

INSTALLATION PROCEDURE

IMPORTANT: While gapping the plug, ensure that the platinum pads remain aligned. Failure to keep the pads aligned will shorten the plug life.

1. Adjust the spark plug gap using a round wire type spark plug gap gauge.

Specification
Spark Plug Gap 1.52 mm (.060 in)

NOTE: Refer to Fastener Notice in Service Precautions.

2. Hand start the spark plugs into the cylinder head, then tighten the plugs.

Tighten
Tighten the spark plugs to 20 N.m (15 lb ft).

3. Apply dielectric lubricant GM P/N 12345579 to the insulator boots.
4. Install the spark plug wires.