Exhaust Manifold Replacement LE5

1. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement .
2. Remove the exhaust manifold heat shield (1). Refer to Exhaust Manifold Heat Shield Replacement .
3. Remove the heated oxygen sensor (HO2S). Refer to Heated Oxygen Sensor 1 Replacement .
4. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .




Notice: Do not bend the exhaust flex decoupler more than 3 degrees in any direction. Movement of more than 3 degrees will damage the exhaust flex decoupler.

5. Remove the catalytic converter. Refer to Catalytic Converter Replacement .
6. Lower the vehicle.



7. Remove the exhaust manifold nuts.
8. Remove the exhaust manifold and discard the gasket.
9. Clean and inspect all of the gasket mating surfaces.

1. Install the NEW exhaust manifold gasket onto the studs.
2. Install the exhaust manifold to the engine.

Notice: Refer to Fastener Notice in the Preface section.




3. Install the NEW exhaust manifold nuts.

Tighten
Tighten the exhaust manifold nuts in sequence to 14 N·m (10 lb ft).

4. Raise and support the vehicle.
5. Install the catalytic converter . Refer to Catalytic Converter Replacement .
6. Lower the vehicle.
7. Install the heated oxygen sensor (HO2S). Refer to Heated Oxygen Sensor 1 Replacement .
8. Install the exhaust manifold heat shield (1). Refer to Exhaust Manifold Heat Shield Replacement .
9. Install the intake manifold cover. Refer to Intake Manifold Cover Replacement .

Exhaust Manifold Replacement L61

1. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement .
2. If equipped with RPO NU3, remove the secondary air injection (AIR) check valve. Refer to Secondary Air Injection Check Valve Replacement .
3. Remove the exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement .
4. Remove the heated oxygen sensor (HO2S). Refer to Heated Oxygen Sensor 1 Replacement .
5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
6. Remove the catalytic converter assembly. Refer to Catalytic Converter Replacement .
7. Lower the vehicle.



8. Remove the exhaust manifold nuts.
9. Remove the exhaust manifold and discard the exhaust manifold gasket.
10. Clean and inspect all gasket mating surfaces.

1. Install a NEW exhaust manifold gasket onto the studs.
2. Install the exhaust manifold to the engine.

Notice: Refer to Fastener Notice in the Preface section.




3. Install NEW exhaust manifold nuts.

Tighten
Tighten the exhaust manifold nuts in sequence to 14 N·m (10 lb ft).

4. Raise and support the vehicle.
5. Install the catalytic converter assembly. Refer to Catalytic Converter Replacement .
6. Lower the vehicle.
7. Install the heated oxygen sensor HO2S. Refer to Heated Oxygen Sensor 1 Replacement .
8. If equipped with RPO NU3, install the AIR check valve. Refer to Secondary Air Injection Check Valve Replacement .
9. Install the intake manifold cover. Refer to Intake Manifold Cover Replacement .
10. Inspect the exhaust system for leaks.

Exhaust Manifold Replacement LNF