Chevrolet Silverado / GMC Sierra. Service manual — part 31

Fig. 67: Upper Intake Manifold
Courtesy of GENERAL MOTORS CORP.

14. Install the intake manifold - upper.

15. If reusing the old throttle body/intake manifold studs, apply threadlock to the threads. Refer

to Sealers, Adhesives, and Lubricants for the correct part number.

16. Install the front two throttle body studs.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

17. Install the intake manifold - upper studs.

Tighten: Tighten the studs to 9 N.m (80 lb in).

18. Connect the power brake booster vacuum hose to the vacuum fitting.

Fig. 68: Locating PCV Valve Hose At Valve & Rocker Cover
Courtesy of GENERAL MOTORS CORP.

19. Install the PCV valve hose to the valve cover and rocker cover.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 69: Engine Wiring Harness Bracket Stud
Courtesy of GENERAL MOTORS CORP.

20. Position the engine wiring harness and bracket.

21. Install the engine wiring harness bracket stud (1).

Tighten: Tighten the stud to 25 N.m (18 lb ft).

22. Install the engine wiring harness rear bracket nut at the EVAP canister purge solenoid valve.

Tighten: Tighten the nut to 9 N.m (80 lb in).

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 70: Engine Wiring Harness Ground Nut
Courtesy of GENERAL MOTORS CORP.

23. Install the engine wiring harness ground nut and ground wire (1) to the rear of the right

cylinder head.

Tighten: Tighten the nut to 16 N.m (12 lb ft).

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado