17. Intake Manifold, Fuel Rail and Injectors

NOTE: The intake manifold, throttle body, fuel injection rail and fuel injectors may be removed as an assembly. If not servicing the individual components, install the intake manifold as a complete assembly. DO NOT reuse intake manifold gaskets. Install NEW intake manifold-to-cylinder head gaskets.

INTAKE MANIFOLD
1. Install NEW intake manifold-to-cylinder head gaskets.





2. Install the intake manifold.
3. Apply a 5 mm (0.20 inch) band of threadlock GM P/N 12345383 or equivalent to the threads of the intake manifold bolts.

WARNING: The fuel rail stop bracket must be installed onto the intake manifold assembly. The stop bracket serves as a protective shield for file fuel rail in the event of a vehicle frontal crash. If the fuel rail stop bracket is not installed and the vehicle is involved in a frontal crash, fuel could be sprayed possibly causing a fire and personal injury from burns.

Intake Manifold Bolt Tightening Sequence:

4. Install the intake manifold bolts and fuel rail stop bracket.
a. Tighten intake manifold bolts first pass in sequence to 5 Nm (44 inch lbs.).
b. Tighten intake manifold bolts final pass in sequence to 8 Nm (89 inch lbs.).
5. Lubricate the grommet of the Manifold Absolute Pressure (MAP) sensor with clean engine oil.





6. Install the MAP sensor (if previously removed).

FUEL RAIL AND INJECTORS

NOTE: DO NOT reuse fuel injector O-ring seals. Install NEW fuel injector O-ring seals during assembly.

1. Lubricate the NEW fuel injector O-ring seals with clean engine oil.
2. Install the O-ring seals onto the fuel injectors.





3. Install the fuel rail (with fuel injectors) into the intake manifold. Press evenly on both sides of the fuel rail until all of the injectors are seated in their bores.
4. Apply a 5 mm (0.20 inch) band of threadlock GM P/N 12345382 or equivalent to the threads of the fuel rail bolts.
5. Install the fuel rail bolts. Tighten the fuel rail bolts to 10 Nm (89 inch lbs.).