Intake Manifold Installation

1. Install the splash shield.





2. Ensure the splash shield (2) snap fits between the cylinder heads (1).





3. Install the new lower intake manifold seals.





4. Install the new lower intake manifold gaskets onto the cylinder heads.





5. Ensure the lower intake manifold gasket tabs (4) align with the hole in the head gasket (3).
6. Ensure the lower intake manifold gasket tabs (1) align with the slot in the lower intake manifold seals (2).





7. Install the lower intake manifold onto the engine block.
8. Apply sealer GM P/N 12345382 or equivalent to a minimum of eight threads of the lower intake manifold bolts.





9. Install the lower intake manifold bolts.
9.1. Tighten the lower intake manifold bolts (1-8) a first pass in sequence to 30 Nm (22 ft. lbs.).
9.2. Tighten the lower intake manifold bolts (1-8) a final pass in sequence to 40 Nm (30 ft. lbs.).

NOTICE: Refer to Fastener Notice in Service Precautions.





10. Install the fuel rail assembly into the intake manifold. Tilt the rail assembly to install the injectors.

IMPORTANT: Lubricate the injector O-ring seals with clean engine oil and install onto the spray tip end of each injector.





11. Install the fuel rail bolts and stud.
- Tighten the fuel rail bolts to 10 Nm (89 inch lbs.).
- Tighten the fuel rail stud to 25 Nm (18 ft. lbs.).





12. Connect the fuel injector regulator vacuum hose connection to the intake manifold fitting.





13. Install the new upper intake manifold gaskets.





14. Ensure the locating tabs on the gasket fit into the lower intake manifold counterbores.





15. Install the upper intake manifold.
16. Apply sealer GM P/N 12345493 or equivalent to a minimum of eight threads of the upper intake manifold bolts.





17. Install the upper intake manifold bolts.
17.1. Tighten the upper intake manifold bolts (1-8) a first pass in sequence to 8 Nm (71 inch lbs.).
17.2. Tighten the upper intake manifold bolts (1-8) a final pass in sequence to 18 Nm (13 ft. lbs.).