Removal Procedure
- Remove the intermediate steering shaft. Refer to Lower Intermediate Steering Shaft Replacement in Steering Wheel and Column - Tilt.
- Remove the bolt for the oil level indicator tube.
- Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
- Disconnect the exhaust pipe from the exhaust manifold. Refer to Exhaust Manifold Pipe Replacement .
- Lower the vehicle to the proper height.
- Remove the front tire in order to gain access to the rear exhaust manifold bolts. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
- Remove the fender wheelhouse extension.
- Remove the spark plug wires from the spark plugs.
- Remove the spark plug wires from the spark plug wire retainers.
- Remove the exhaust manifold bolts.
- Remove the spark plug wire shields and the exhaust manifold.
- Remove and discard the exhaust manifold gaskets.
- Clean all gasket surfaces. Refer to Exhaust Manifold Cleaning and Inspection .
Notice: Twist the spark plug boot one-half turn in order to release the boot. Pull on the spark plug boot only. Do not pull on the spark plug wire or the wire could be damaged.
| 8.1. | Rotate the spark plug wire boot one half turn. |
| 8.2. | Pull outward on the spark plug wire boot to release from the spark plug. |
Installation Procedure
- Sub-assemble the bolts, spark plug wire shields, and NEW gaskets to the exhaust manifold.
- Ensure that the exhaust manifold bolts are held in place by the tabs on the exhaust manifold gaskets.
- Install the exhaust manifold.
- Install the spark plug wire shields.
- If reusing the fasteners, apply threadlock GM P/N 12345493 or equivalent to the threads of the exhaust manifold bolts.
- Install the exhaust manifold bolts.
- Tighten the exhaust manifold bolts on the first pass to 15 N·m (11 lb ft).
- Tighten the exhaust manifold bolts on the final pass to 30 N·m (22 lb ft).
- Install the spark plug wires to the spark plug wire retainers.
- Install the spark plug wires onto the spark plugs.
- Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
- Connect the exhaust pipe to the exhaust manifold.
- Install the fender wheel house extension.
- Install the front tire. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
- Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
- Connect the exhaust pipe to the exhaust manifold. Refer to Exhaust Manifold Pipe Replacement .
- Lower the vehicle.
- Install the bolt for the oil level indicator tube.
- Install the intermediate steering shaft. Refer to Lower Intermediate Steering Shaft Replacement in Steering Wheel and Column - Tilt.
Important: To assist in installing the exhaust manifold to the engine, the tabs at the bolt holes on a NEW exhaust manifold gasket will hold the bolts and the gaskets in place.
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.
Tighten
Refer to Exhaust Manifold Pipe Replacement .
Tighten
Tighten the oil level indicator tube bolt to 12 N·m (106 lb in).
