Installation Procedure

Fig 1: View Of Spark Plug And Spark Plug Seat

Courtesy of GENERAL MOTORS CORP.

Correctly position the spark plug washer.
Inspect the spark plug gap. Adjust the gap as needed.
Specification: Spark plug gap: 1.524 mm (0.060 in)
Hand start the spark plug in the corresponding cylinder.

CAUTION: Refer to Fastener Caution .

Tighten the spark plug.
- For used heads, tighten the plug to 15 N.m (11 lb ft).
- For NEW heads, tighten the plug to 20 N.m (15 lb ft).
Install the spark plug wire. Refer to Spark Plug Wire Replacement .
If removed, install the washer solvent container. Refer to Windshield Washer Solvent Container Replacement (Envoy, TrailBlazer) .