For 1990-2009 cars

#### Special Tools

• | EN 46101 Spark Plug Tube Seal Guide

• | EN 46105 Camshaft Locking Tool

1. Remove the EN 46105-2 from the rear of the left camshafts.
2. Install the EN 46101 onto the spark plug tubes of the left cylinder head.
3. Install the camshaft cover bolt grommets prior to installing the camshaft cover bolts.
4. Wipe the camshaft cover sealing surface on the left cylinder head with a clean, lint-free cloth.
5. Place a bead 8 mm (0.3150 in) in diameter by 4 mm (0.1575 in) in height of RTV sealant, GM P/N 12378521 (Canadian P/N 88901148) or equivalent, on the engine front cover split lines (1).
6. Place the left camshaft cover into position onto the left cylinder head.
7. Loosely install the left camshaft cover bolts.

Caution: Refer to Fastener Caution in the Preface section.

8. Tighten the left camshaft cover bolts in the sequence shown.

Tighten
Tighten the left camshaft cover bolts in the sequence to 10 N·m (89 lb in).

9. Remove the EN 46101 from the spark plug tubes of the left cylinder head.
10. Install the NEW spark plugs into the left cylinder head.

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

11. Install the ignition coils.
12. Install the ignition coil bolt.

Tighten
Tighten the ignition coil bolt to 10 N·m (89 lb in).