GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 Express 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L 🢒 Intake Manifold Replacement

Removal Procedure

    Important: The intake manifold, throttle body, fuel rail, and injectors may be removed as an assembly. If not servicing the individual components, remove the manifold as a complete assembly.

  1. Remove the throttle body. Refer to Throttle Body Assembly Replacement .
  2. Remove the fuel injectors. Refer to Fuel Injector Replacement .

    3. Object Number: 679510 Size: SH
  3. Disconnect the following electrical connectors:
    4. • Manifold absolute pressure (MAP) sensor (1)
    • Knock sensor (2)
  4. Remove the knock sensor harness electrical connector from the intake manifold.
  5. Set the electrical harness aside.

    6. Object Number: 1809532 Size: SH
  6. Disconnect the electronic temperature control (ETC) connector.

    7. Object Number: 1905664 Size: SH
  7. Remove the positive crankcase ventilation (PCV) hose - dirty air (716).

    8. Object Number: 1401987 Size: SH
  8. Remove the MAP sensor (714) and retainer (736) as required.
  9. Remove the O-ring (715) from the sensor, as required.

    10. Object Number: 372717 Size: SH
  10. Remove the evaporative emission (EVAP) purge solenoid vent tube by performing the following:
    11. 10.1. Remove the EVAP tube end (2) from the solenoid (1).
    10.2. Squeeze the EVAP pipe quick connect fitting (3) retainer together.
    10.3. Remove the EVAP tube end (3) from the vapor pipe.

    Object Number: 389993 Size: SH
  11. Remove the EVAP purge solenoid bolt (2), solenoid (3), and isolator (1) from the intake manifold.

    12. Object Number: 1403311 Size: SH
  12. Remove the intake manifold bolts (512).
  13. Remove the intake manifold (500) with gaskets.

    14. Object Number: 1277097 Size: SH
  14. Remove the intake manifold gaskets (514).
  15. Discard the intake manifold gaskets.

Installation Procedure

    Object Number: 1277097 Size: SH
  1. Install NEW intake manifold gaskets (514) to the intake manifold.

    2. Object Number: 1403311 Size: SH
  2. Install the intake manifold (500).
  3. Apply a 5 mm (0.20 in) band of threadlock GM P/N 12345382 (Canadian P/N 10953489) to the threads of the intake manifold bolts (512). Refer to Adhesives, Fluids, Lubricants, and Sealers for the correct part number.

    4. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1552512 Size: SH
  4. Install the intake manifold bolts.

    5. Tighten

    1. Tighten the intake manifold bolts a first pass in sequence to 5 N·m (44 lb in).
    2. Tighten the intake manifold bolts a final pass in sequence to 10 N·m (89 lb in).

    Object Number: 389993 Size: SH
  5. Install the EVAP purge solenoid (3), isolator (1), and bolt (2) to the intake manifold.

    6. Tighten
    Tighten the EVAP purge solenoid bolt to 10 N·m (89 lb in).


    Object Number: 372717 Size: SH
  6. Install the EVAP purge solenoid vent tube to the solenoid (1) and vapor pipe.
  7. Install the engine coolant air bleed clamp and hose to the throttle body, if applicable.

    8. Object Number: 1401987 Size: SH
  8. Lubricate the MAP sensor grommet (715) with clean engine oil.
  9. Install the grommet onto the MAP sensor (714).
  10. Install the MAP sensor (714) and the retainer (736).

    11. Object Number: 1905664 Size: SH
  11. Install the PCV hose - dirty air (716).

    12. Object Number: 679510 Size: SH
  12. Connect the knock sensor harness electrical connector to the intake manifold.
  13. Connect the following electrical connectors:
    14. • MAP sensor (1)
    • Knock sensor (2)
    • Exhaust gas recirculation (EGR) valve, if equipped
  14. Install the fuel injectors. Refer to Fuel Injector Replacement .
  15. Install the throttle body. Refer to Throttle Body Assembly Replacement .