Left

Exhaust Manifold Replacement - Left

Removal Procedure





1. Disconnect the breather tube at the air cleaner outlet duct.





2. Remove the air cleaner outlet duct retaining wingnut.





3. Disconnect the IAT sensor harness connector.





4. Remove the air cleaner outlet duct from the throttle body.





5. Remove the intermediate steering shaft.
6. Disconnect the engine coolant temperature (ECT) sensor electrical connector.





7. Remove the radiator inlet hose support bracket and nut.
8. Raise the vehicle. Refer to Vehicle Lifting.
9. Disconnect the exhaust pipe from the exhaust manifold.
10. Lower vehicle.
11. Remove the front tire to gain access to the rear exhaust manifold bolts.





12. Remove the fender wheelhouse extension.
13. Working through the wheel house opening disconnect the spark plug wires from the spark plugs.
13.1. Rotate the spark plug wire boot one half turn.
13.2. Pull outward on the spark plug wire boot to release from the spark plug.





14. Remove the exhaust manifold bolts and the stud.
15. Lower the vehicle.
16. From under the hood remove the exhaust manifold and the spark plug wire shields from the engine.





17. Remove and discard the exhaust manifold gaskets.
18. Clean all gasket surfaces.

Installation Procedure

Important: To assist in installing the exhaust manifold to the engine, the tabs on a NEW exhaust manifold gasket will hold the gasket and bolts in place.





1. Sub-assemble the bolts, spark plug wire shields, and NEW gaskets to the exhaust manifold.
The stud installs in the front hole.
2. Ensure that the exhaust manifold bolts are held in place by the tabs on the exhaust manifold gaskets.
3. From under the hood position the exhaust manifold by the engine.
4. Raise the vehicle to the proper height.





5. Working the wheelhouse opening, install the exhaust manifold.
6. Install the spark plug wire shields.
7. If reusing the fasteners, apply threadlock GM P/N 12345493 (Canadian P/N 10953488) or equivalent to the threads of the exhaust manifold bolts and stud.

Notice: Refer to Fastener Notice in Service Precautions.

8. Install the exhaust manifold bolts and stud.
8.1. Tighten the exhaust manifold bolts and stud on the first pass to 15 Nm (11 ft. lbs.).
8.2. Tighten the exhaust manifold bolts and stud on the final pass to 30 Nm (22 ft. lbs.).
9. Install the spark plug wires to the spark plug wire retainers.
10. Install the spark plug wires onto the spark plugs.





11. Install the fender wheelhouse extension.
12. Install the front tire to.
13. Raise the vehicle. Refer to Vehicle Lifting.
14. Connect the exhaust pipe to the exhaust manifold.
15. Lower the vehicle.





16. Connect the ECT sensor electrical connector.





17. Install the radiator inlet hose support bracket and nut.
^ Tighten the radiator inlet hose support bracket nut to 36 Nm (27 ft. lbs.).
18. Install the intermediate steering shaft.

Notice:
^ Handle the MAF sensor carefully.
^ Do not drop the MAF sensor in order to prevent damage to the MAF sensor.
^ Do not damage the screen located on the air inlet end of the MAF.
^ Do not touch the sensing elements.
^ Do not allow solvents and lubricants to come in contact with the sensing elements.
^ Use a small amount of a soap based solution in order to aid in the installation.





19. Install air cleaner outlet duct to throttle body.
20. Install air cleaner outlet duct to MAF sensor.





21. Connect the IAT sensor harness connector.





22. Install the air cleaner outlet duct retaining wingnut.





23. Connect the breather tube to the air cleaner outlet duct.