C 2500 Suburban 2WD V8-8.1L VIN G (2001)
11. Install the intake manifold.
12. Apply thread adhesive GM P/N 12345382 or equivalent to a minimum of eight threads of the intake manifold bolts.
13. Install the intake manifold bolts.
Notice: Refer to Fastener Notice in Service Precautions.
14. Tighten the intake manifold bolts in sequence, using four passes as shown.
14.1.
Tighten the intake manifold bolts in sequence to 5 Nm (44 inch lbs.) on the first pass.
14.2.
Tighten the intake manifold bolts in sequence to 5 Nm (44 inch lbs.) on the second pass. Inspect the intake manifold joints for signs of
intake manifold shifting. Correct as required.
14.3.
Tighten the intake manifold bolts in sequence to 10 Nm (89 inch lbs.) on the third pass.
14.4.
Tighten the intake manifold bolts in sequence to 12 Nm (106 inch lbs.) on the final pass.
Important: Lubricate the fuel injector O-ring seals with clean engine oil and install onto the spray tip of each injector.
15. If replacing the intake manifold, install the fuel rail.
16. Install the fuel rail studs.
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Tighten the fuel rail studs to 12 Nm (106 inch lbs.).
17. Install the fuel pressure regulator vacuum hose.