Exhaust Manifold Replacement - Left
Exhaust Manifold Replacement - LeftRemoval Procedure
1. Remove the fuel rail cover.
2. Remove the generator.
3. Raise and suitably support the vehicle. Refer to Vehicle Lifting.
4. Remove the exhaust manifold nuts.
5. Remove the Connector Position Assurance (CPA) lock.
6. Disconnect the oxygen sensor electrical connector.
7. Remove the oxygen sensor connector clip at the body.
Notice: Refer to Oxygen Sensor Notice in Service Precautions.
8. Remove the oxygen sensor.
9. Lower the vehicle.
10. Remove the hose clamp at the secondary Air Injection (AIR) pipe.
11. Remove the AIR hose from the AIR pipe.
12. Remove the hose clamps at the right and left check valves.
13. Remove the AIR injection pipe hose (1) from the right check valve.
14. Remove the AIR injection pipe hose (3) from the left check valve.
15. Remove the AIR pipe (2).
Important: Do not remove the check valve from the AIR pipe unless valve service is required.
16. Remove the AIR pipe bolts.
17. Remove the AIR pipe and gasket. Discard the old gasket
18. Remove the brake booster vacuum hose from the brake booster.
19. Remove the ignition coil bracket studs.
20. Remove the ignition coil bracket.
21. Remove the spark plugs.
22. Remove the exhaust manifold bolts.
23. Remove the exhaust manifold, and old gasket. Discard the gasket.
24. If necessary, remove the exhaust manifold heat shield bolts and shield.
Installation Procedure
Important: Tighten the exhaust manifold bolts as specified in the service procedure. Improperly installed and/or leaking exhaust manifold gaskets may effect vehicle emissions and/or On-Board Diagnostics (OBD) 11 system performance.
The cylinder head exhaust manifold bolt hole threads must be cleaned and free of debris or threadlocking material.
Notice: Refer to Fastener Notice in Service Precautions.
1. If necessary, install the exhaust manifold heat shield and bolts.
Tighten the exhaust manifold heat shield bolts to 9 Nm (80 inch lbs.).
2. Apply a 5 mm (0.2 inch) wide band of threadlock GM P/N 12345493 (Canadian P/N 10953489), or equivalent to the threads of the exhaust manifold bolts.
3. Position the exhaust manifold and a NEW gasket into place.
4. Install the exhaust manifold bolts.
4.1. Tighten the exhaust manifold bolts a first pass to 15 Nm (11 ft. lbs.). Tighten the exhaust manifold bolts beginning with the center two bolts. Alternate from side-to-side, working toward the outside bolts.
4.2. Tighten the exhaust manifold bolts a final pass to 25 Nm (18 ft. lbs.). Tighten the exhaust manifold bolts beginning with the center two bolts. Alternate from side-to-side, working toward the outside bolts.
5. Bend over the exposed edge of the exhaust manifold gasket at the rear of the cylinder head.
6. Install the spark plugs.
7. Place the ignition coil bracket into place.
8. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489), or equivalent to the threads of the coil bracket studs.
9. Install the ignition coil bracket studs.
Tighten the ignition coil bracket studs to 12 Nm (106 inch lbs.).
10. Install the brake booster vacuum hose to the brake booster.
11. Install the AIR pipe (with check valve) and a NEW gasket.
12. Install the AIR pipe bolts.
Tighten the AIR pipe bolts to 20 Nm (15 ft. lbs.).
13. Install the AIR pipe (2).
14. Install the AIR injection pipe hose (3) to the left check valve.
15. Install the AIR injection pipe hose (1) to the right check valve.
16. Install the hose clamps at the right and left check valves.
17. Install the AIR hose to the AIR pipe.
18. Install the hose clamp at the AIR pipe.
19. Raise the vehicle.
20. Apply anti-seize compound GM P/N 12377953 or equivalent to the threads of the oxygen sensor.
Notice: Refer to Oxygen Sensor Notice in Service Precautions.
21. Install the oxygen sensor.
Tighten the oxygen sensor to 42 Nm (30 ft. lbs.).
22. Install the oxygen sensor connector clip at the body.
23. Connect the oxygen sensor electrical connector.
24. Install the CPA lock.
25. Install the exhaust manifold nuts.
Tighten the exhaust manifold nuts to 20 Nm (15 ft. lbs.).
26. Lower the vehicle.
27. Install the generator.
28. Install the fuel rail cover.