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JOHN aka Eauto
JOHN aka Eauto, The Car Guy
Category: Chevy
Satisfied Customers: 15074
Experience:  ase tech
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What is the torque specs and sequence intake manifold on

Customer Question

what is the torque specs and sequence for upper intake manifold on 2002 4.3 liter V6 with a CSEFI fuel system, also known as spider injection?
JA: Thanks. Can you give me any more details about your issue?
Customer: i just changed the spider injection unit and need to bolt the plastic intake plenum back onto the lower intake
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Submitted: 9 months ago.
Category: Chevy
Expert:  JOHN aka Eauto replied 9 months ago.

Lower Intake Manifold Bolt

First Pass in Sequence3 Nm (27 inch lbs.)

Second Pass in Sequence12 Nm (106 inch lbs.)

Final Pass in Sequence15 Nm (11 ft. lbs.)

NOTE: No tightening sequence was supplied by the manufacturer for the upper intake manifold.

Upper Intake Manifold Stud

First Pass5 Nm (44 inch lbs.)

Final Pass9 Nm (80 inch lbs.)

Throttle Body Stud9 Nm (80 inch lbs.)

Surface Flatness - Maximum0.10 mm (0.004 inch)