For 1990-2009 cars

#### Tools Required

EN 46101 Spark Plug Tube Seal Guide

### Removal Procedure

1. Remove the upper intake manifold. Refer to Upper Intake Manifold Replacement .
2. Remove the left side ignition coils. Refer to Ignition Coil Replacement - Bank 2 .
3. Unclip and reposition wire harness from camshaft cover .
4. Remove the left camshaft cover bolts.
5. Remove the left camshaft cover from the left cylinder head.
6. Clean the mating surfaces of the cylinder head and the camshaft cover. Refer to Camshaft Cover Cleaning and Inspection .
7. Install the EN 46101 onto the spark plug tubes of the left cylinder head.

### Installation Procedure

1. Install new camshaft cover bolt grommets prior to installing the camshaft cover bolts.
2. 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).
3. Place the left camshaft cover into position onto the left cylinder head.
4. Loosely install the left camshaft cover bolts.

Notice: Refer to Fastener Notice in the Preface section.

5. 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).

6. Remove the EN 46101 from the spark plug tubes of the left cylinder head.
7. Position wire harness and clip to camshaft cover.
8. Remove the left side ignition coils. Refer to Ignition Coil Replacement - Bank 2 .
9. Remove the upper intake manifold. Refer to Upper Intake Manifold Replacement .