Chevrolet Silverado / GMC Sierra. Service manual — part 1797

14. Inspect the spark plug wires for proper installation.

1. Push sideways on each boot in order to inspect the seating.

2. Reinstall any loose boot.

15. Fully raise and support the vehicle.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 17: View Of Exhaust Manifold, Gasket & Catalytic Converter
Courtesy of GENERAL MOTORS CORP.

16. Install the catalytic converter to exhaust manifold nuts. (1500 series shown, 2500 series

similar).

Tighten: Tighten the nuts to 50 N.m (37 lb ft).

17. Partially lower the vehicle.

Fig. 18: Identifying J 42640
Courtesy of GENERAL MOTORS CORP.

18. Install the left wheelhouse liner. Refer to Front Wheelhouse Liner Replacement - Left

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Side (Chevrolet) or Front Wheelhouse Liner Replacement - Left Side (GMC) .

19. Remove the J 42640 from the steering column lower access hole.

EXHAUST MANIFOLD REPLACEMENT - LEFT SIDE (6.6L)

Removal Procedure

Fig. 19: View Of EGR Cooler Pipe Bracket Bolt
Courtesy of GENERAL MOTORS CORP.

1. Drain the cooling system. Refer to Cooling System Draining and Filling (Vac-N-Fill) or

Cooling System Draining and Filling (Static Fill) .

2. Remove the charge air cooler inlet pipe. Refer to Charge Air Cooler Inlet Pipe

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Replacement .

3. Remove the glow plug control module. Refer to Glow Plug Control Module

Replacement .

4. Remove the exhaust gas recirculation (EGR) cooler pipe bracket upper bolt (1).

5. Raise and suitably support the vehicle half way. Refer to Lifting and Jacking the

Vehicle .

Fig. 20: View Of EGR Cooler Pipe & Bolt
Courtesy of GENERAL MOTORS CORP.

6. Perform the following steps working through the wheelhouse opening, remove the EGR

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado