Chevrolet Silverado / GMC Sierra. Manual - part 177
Fig. 590: Identifying Upper Intake Manifold Attaching Studs
Courtesy of GENERAL MOTORS CORP.
7. Install a NEW upper intake manifold to lower intake manifold gasket into the groove of the
upper intake manifold.
8. Install the upper intake manifold onto the lower intake manifold.
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
9. If reusing the fasteners, apply threadlock GM P/N 12345382 (Canadian P/N 10953489) or
equivalent, to the threads of the upper intake manifold attaching studs.
10. Install the upper intake manifold attaching studs.
Tighten:
1. Tighten the upper intake manifold attaching studs on the first pass to 5 N.m (44 lb in).
2. Tighten the upper intake manifold attaching studs on the final pass to 9 N.m (80 lb in).
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
Fig. 591: Purge Solenoid & Nut
Courtesy of GENERAL MOTORS CORP.
11. If reusing the fasteners, apply threadlock GM P/N 12345382 (Canadian P/N 10953489) or
equivalent, to the threads of the evaporative emission (EVAP) canister purge solenoid valve
studs.
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
12. Install the EVAP canister purge solenoid valve and studs.
Tighten: Tighten the EVAP canister purge solenoid valve studs to 10 N.m (89 lb in).
13. Install the engine wiring harness bracket and nut.
Tighten: Tighten the engine wiring harness bracket nut to 12 N.m (106 lb in).
Fig. 592: Fuel Pipes & New Seals
Courtesy of GENERAL MOTORS CORP.
14. Install the NEW fuel seals (514), black O-rings, into the fuel meter body.
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado