GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 HUMMER 🢒 2007 🢒 H3 🢒 Engine 🢒 Engine Controls and Fuel - 3.7L 🢒 Intake Manifold Replacement

Removal Procedure
  1. Remove the throttle body. Refer to Throttle Body Assembly Replacement.
  2. Remove the battery box. Refer to Battery Box Replacement.
  3. Remove the oil level indicator and tube. Refer to Oil Level Indicator and Tube Replacement .

    4. Object Number: 1699701 Size: SH
  4. Disconnect the manifold absolute pressure (MAP) sensor electrical connector (3).
  5. Disconnect the MAP sensor wiring harness retainer (4) from the intake manifold.
  6. Disconnect the positive crankcase ventilation (PCV) dirty air tube (2) from the camshaft cover.
  7. Remove the generator. Refer to Generator Replacement.

    8. Object Number: 1560036 Size: SH
  8. Remove the engine wiring harness retainer from the engine wiring harness bracket.

    9. Object Number: 1350700 Size: SH
  9. Remove the 2 upper bolts securing the engine wiring harness bracket to the intake manifold.
  10. Raise and support the vehicle only high enough to access the remaining components through the wheelhouse. Refer to Lifting and Jacking the Vehicle.
  11. Remove the left front wheel. Refer to Tire and Wheel Removal and Installation.
  12. Remove the left front wheelhouse liner. Refer to Wheelhouse Panel Replacement.

    13. Object Number: 1350692 Size: SH
  13. Disconnect the following wiring harness retainers from the engine wiring harness bracket:
    14. • The battery cable
    • The engine (4, 6)
    • The MAP sensor (5)
  14. Remove the remaining lower engine wiring harness bracket bolt. Remove the bracket from the engine compartment through the wheelhouse opening.

    15. Object Number: 858166 Size: SH
  15. Remove the intake manifold bolts.
  16. Lower the vehicle.
  17. Remove the intake manifold from the cylinder head.
  18. Remove and discard the seal from the intake manifold.
  19. Mask off the open ports to the cylinder head, in order to prevent foreign objects from entering the engine.
  20. Clean and inspect the intake manifold. Refer to Intake Manifold Cleaning and Inspection .

Installation Procedure
  1. Remove the masking from the cylinder head and ensure the sealing surface is clean and dry.
  2. Install a NEW seal into the intake manifold groove.

    3. Object Number: 858166 Size: SH
  3. Position the intake manifold to the cylinder head.
  4. Raise and support the vehicle only high enough to access the following components through the wheelhouse. Refer to Lifting and Jacking the Vehicle:
    5. • The intake manifold bolts
    • The engine wiring harness bracket bolts
    • The wiring harnesses

    Notice: Refer to Fastener Notice in the Preface section.

  5. Install the intake manifold bolts.

    6. Tighten
    Tighten the bolts from the inside working outward to 10 N·m (89 lb in).


    Object Number: 1350700 Size: SH
  6. Position the engine wiring harness bracket to the engine and harnesses.
  7. Install the engine wiring harness bracket bolts.

    8. Tighten
    Tighten the bolts to 10 N·m (89 lb in).


    Object Number: 1350692 Size: SH
  8. Secure the following wiring harness retainers to the engine wiring harness bracket:
    9. • The battery cable
    • The engine (4, 6)
    • The MAP sensor (5)
  9. Install the left front wheelhouse liner. Refer to Wheelhouse Panel Replacement.
  10. Install the left front wheel. Refer to Tire and Wheel Removal and Installation.
  11. Lower the vehicle.

    12. Object Number: 1560036 Size: SH
  12. Connect the engine wiring harness retainer to the engine wiring harness bracket.
  13. Install the generator. Refer to Generator Replacement.

    14. Object Number: 1699701 Size: SH
  14. Connect the PCV dirty air tube (2) to the camshaft cover.
  15. Connect the MAP sensor wiring harness retainer (4) to the intake manifold.
  16. Connect the MAP sensor electrical connector (3).
  17. Install the oil level indicator and tube. Refer to Oil Level Indicator and Tube Replacement .
  18. Install the battery box. Refer to Battery Box Replacement.
  19. Install the throttle body. Refer to Throttle Body Assembly Replacement.