Exhaust Manifold Replacement - Right Side RPOs L26/L32

1. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement .
2. Remove the exhaust crossover heat shield nuts (1).
3. Remove the exhaust crossover heat shield (2).



4. Remove the exhaust crossover pipe studs (3) from the right exhaust manifold.
5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .



6. Remove the exhaust manifold pipe stud nuts (2) and the catalytic converter pipe (3) from the right exhaust manifold.
7. Lower the vehicle.
8. Rotate the engine to access the right side of the engine. Refer to Rotating the Engine for Service Access .



9. Disconnect the heated oxygen sensor (HO2S) electrical connector (1).
10. Remove the HO2S electrical connector (1) from the engine sight shield bracket.
11. Remove the HO2S (2) from the right exhaust manifold. Refer to Heated Oxygen Sensor 1 Replacement
12. Remove the right side spark plugs from cylinders 2, 4 and 6. Refer to Spark Plug Replacement .



13. Remove the fuel injector sight shield bracket nuts (2).
14. Remove the fuel injector sight shield bracket (1).



15. Remove the right engine lift bracket bolt (2) and the nut (3).
16. Remove the right engine lift bracket (1).



17. Remove the right exhaust manifold heat shield bolts (2).
18. Remove the right exhaust manifold heat shield (1).
19. Raise the vehicle.



20. Remove the exhaust gas recirculation (EGR) valve inlet adapter pipe bolt (1) from the right exhaust manifold.
21. Lower the vehicle.



22. Remove the right exhaust manifold studs (4) and the nuts (3).
23. Remove the right exhaust manifold (2).
24. Remove the right exhaust manifold gasket (1).



25. Remove the exhaust manifold studs if damaged.
26. Clean and Inspect the right exhaust manifold. Refer to Exhaust Manifold Cleaning and Inspection .

1. Install the exhaust manifold studs if removed.



2. Install the right exhaust manifold gasket (1).
3. Install the right exhaust manifold (2).

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

4. Install the right exhaust manifold studs (4) and the nuts (3).

Tighten
Tighten the studs and the nuts to 30 N·m (22 lb ft).

5. Raise the vehicle.



6. Install the exhaust gas recirculation (EGR) valve inlet adapter pipe bolt (1) to the right exhaust manifold.

Tighten
Tighten the bolt to 29 N·m (21 lb ft).

7. Lower the vehicle.



8. Install the right exhaust manifold heat shield (1).
9. Install the right exhaust manifold heat shield bolts (2).

Tighten
Tighten the bolts to 10 N·m (89 lb in).




10. Install the right engine lift bracket (1).
11. Install the right engine lift bracket bolt (2) and the nut (3).

Tighten
Tighten the bolt and the nut to 30 N·m (22 lb ft).




12. Install the fuel injector sight shield bracket (1).
13. Install the fuel injector sight shield bracket nuts (2).

Tighten
Tighten the nuts to 30 N·m (22 lb ft).

14. Install the right side spark plugs to cylinders 2, 4 and 6. Refer to Spark Plug Replacement .



15. Install the HO2S (2) to the right exhaust manifold. Refer to Heated Oxygen Sensor 1 Replacement .
16. Install the HO2S electrical connector (1) to the engine sight shield bracket.
17. Connect the HO2S electrical connector (1).
18. Return the engine to the original position.
19. Raise the vehicle.



20. Install the catalytic converter pipe (3) to the right exhaust manifold.
21. Install the catalytic converter pipe stud nuts (2) to the right exhaust manifold.

Tighten
Tighten the stud nuts to 35 N·m (26 lb ft).

22. Lower the vehicle.



23. Install the exhaust crossover pipe studs (3) to the right exhaust manifold.

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




24. Install the exhaust crossover heat shield (2).
25. Install the exhaust crossover heat shield nuts (1).

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

26. Install the engine mount struts. Refer to Engine Mount Strut Replacement - Right Side and Engine Mount Strut Replacement - Left Side .
27. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement .

Exhaust Manifold Replacement - Right Side RPO LS4

1. Remove the engine sight shield. Refer to Upper Intake Manifold Sight Shield Replacement .
2. Remove the spark plugs. Refer to Spark Plug Replacement .
3. Remove the exhaust crossover pipe nuts from the right exhaust manifold.
4. Disconnect the catalytic converter from the exhaust manifold. Refer to Catalytic Converter Replacement .
5. Support the catalytic convertor and exhaust system with the mechanics wire.
6. Lower the vehicle.
7. Remove the ignition coil. Refer to Ignition Coil Replacement .
8. Remove the O2 sensors. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 .



9. Remove the exhaust manifold heat shield bolts (604).
10. Remove the exhaust manifold heat shield (603).



11. Remove the exhaust manifold bolts.
12. Remove the exhaust manifold.
13. Remove and discard the exhaust manifold gasket.
14. Clean and inspect the left exhaust manifold. Refer to Exhaust Manifold Cleaning and Inspection .

Important: 

1. Apply a 5 mm (0.2 in) wide band of threadlock GM P/N 12345493 (Canadian P/N 10953488) or equivalent to the threads of the exhaust manifold bolts.

Notice: Refer to Fastener Notice in the Preface section.

2. Install a NEW exhaust manifold gasket, the exhaust manifold and bolts.

Tighten

•	Tighten the bolts a first pass to 15 N·m (11 lb ft). Tighten the bolts beginning with the center 2 bolts. Alternate from side to side, and work toward the outside.

•	Tighten the bolts a final pass to 20 N·m (15 lb ft). Tighten the bolts beginning with the center 2 bolts. Alternate from side to side, and work toward the outside.

3. Using a flat punch, bend over the exposed edge of the exhaust manifold gasket at the rear of the right cylinder head.



4. Install the exhaust manifold heat shield (603).
5. Install the exhaust manifold heat shield bolts (604).

Tighten
Tighten the bolts to 9 N·m (80 lb in).

6. Install the O2 sensor. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 .
7. Raise the vehicle.
8. Remove the mechanics wire from the exhaust system and connect the catalytic converter. Refer to Catalytic Converter Replacement .



9. Install the exhaust crossover pipe nuts to the right exhaust manifold.

Tighten
Tighten the nuts to 25 N·m (18 lb ft).

10. Install the ignition coil. Refer to Ignition Coil Replacement .
11. Install the spark plugs. Refer to Spark Plug Replacement .
12. Install the fuel injector sight shield. Refer to Upper Intake Manifold Sight Shield Replacement .