For 1990-2009 cars only
Removal Procedure
- Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle.
- Remove the exhaust manifold pipe nuts.
- Lower the vehicle.
- Remove the spark plug wires. Refer to Spark Plug Wire Replacement.
- Remove the exhaust manifold bolts, manifold, and gasket.
- Discard the gasket.
- Remove the heat shield bolts (3), and shield (2) from the exhaust manifold (1), if necessary.
Installation Procedure
- Install the heat shield (2), and bolts (3) to the exhaust manifold (1), if necessary.
- Apply a 5 mm (0.2 in) wide band of threadlock GM P/N 12345493 (Canadian P/N 101953488) or equivalent to the threads of the exhaust manifold bolts.
- Install the exhaust manifold, NEW gasket and bolts.
- Tighten the exhaust manifold bolts a first pass to 15 N·m (11 lb ft). Tighten the exhaust manifold bolts beginning with the center two bolts. Alternate from side-to-side, and work toward the outside bolts.
- Tighten the exhaust manifold bolts a final pass to 25 N·m (18 lb ft). Tighten the exhaust manifold bolts beginning with the center two bolts. Alternate from side-to-side, and work toward the outside bolts.
- Install the spark plug wires. Refer to Spark Plug Wire Replacement.
- Using a flat punch, bend over the exposed edge of the exhaust manifold gasket at the rear of the left cylinder head.
- Raise the vehicle.
- Install the exhaust manifold pipe nuts.
- Lower the vehicle.
Caution: Refer to Fastener Caution in the Preface section.
Tighten
Tighten the bolts to 9 N·m (80 lb in).
Note:
• Tighten the exhaust manifold bolts as specified in the service procedure. Improperly installed and/or leaking exhaust manifold gaskets may affect vehicle emissions and/or On-Board Diagnostics (OBD) II system performance. • The cylinder head exhaust manifold bolt hole threads must be clean and free of debris or threadlocking material. • Do not apply sealant to the first three threads of the bolt.
Tighten
Tighten
Tighten the nuts to 50 N·m (37 lb ft).
