GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2009 🢒 Sierra Denali 🢒 Engine 🢒 Engine Cooling 🢒 Intake Manifold Tube Replacement

Removal Procedure
  1. Disconnect the negative battery cables. Refer to Battery Negative Cable Disconnection and Connection.

    2. Object Number: 1871196 Size: SH
  2. Open the intake air heater (IAH) harness lead cover (2).
  3. Remove the engine wiring harness lead nut (1) from the IAH stud.
  4. Remove the engine wiring harness lead (3) from the IAH stud.

    5. Object Number: 1873415 Size: SH
  5. Remove the electrical harness bolts (1).
  6. Reposition the harness clip from the intake manifold tube, as needed.

    7. Object Number: 1873422 Size: SH
  7. Remove the air inlet tube to intake manifold tube bolt and nut.

    8. Object Number: 1873444 Size: SH
  8. Disconnect the intake air heater electrical connector.
  9. Disconnect the manifold absolute pressure (MAP) sensor electrical connector.
  10. Remove the engine harness clip from the air inlet tube.
  11. Remove the air inlet tube nuts and bolt.
  12. Remove the air inlet tube.

    13. Object Number: 1873384 Size: SH
  13. If necessary, remove the intake manifold tube.
  14. If necessary, remove and discard the 2 O-ring seals from the tube.
  15. Clean the gasket surfaces of the exhaust gas recirculation (EGR) cooler tube, intake manifold tube and inlet tube.

Installation Procedure

    Object Number: 1873384 Size: SH
  1. If necessary, install NEW O-ring seals onto the tube.
  2. If necessary, install the intake manifold tube.

    3. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1873444 Size: SH
  3. Install the air inlet tube and NEW gaskets.
  4. Install the air inlet tube nuts and bolt.

    5. Tighten
    Tighten the nuts to 25 N·m (18 lb ft).

  5. Connect the intake air heater electrical connector.
  6. Connect the MAP sensor electrical connector.
  7. Install the engine harness clip to the air inlet tube.

    8. Object Number: 1873422 Size: SH
  8. Install the air inlet tube to intake manifold tube bolt and nut.

    9. Tighten
    Tighten the bolt/nut to 10 N·m (89 lb in).


    Object Number: 1873415 Size: SH
  9. Install the electrical harness bolts (1).

    10. Tighten
    Tighten the bolts to 4 N·m (35 lb in).


    Object Number: 1871196 Size: SH
  10. Install the engine wiring harness lead (3) to the IAH stud.
  11. Install the engine wiring harness lead nut (1) to the IAH stud.

    12. Tighten
    Tighten the nut to 10 N·m (89 lb in).

  12. Close the IAH harness lead cover (2).
  13. Connect the negative battery cables. Refer to Battery Negative Cable Disconnection and Connection.