GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2008 🢒 G8 🢒 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 injection 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 engine cover. Refer to Engine Cover Replacement.
  2. Depressurize the fuel system. Refer to Fuel Pressure Relief.
  3. Disconnect the battery ground cable. Refer to Battery Negative Cable Disconnection and Connection .
  4. Drain the cooling system. Refer to Cooling System Draining and Filling.
  5. Remove the air intake duct. Refer to Air Cleaner Inlet Duct Replacement .

    6. Object Number: 1954082 Size: SH
  6. Reposition and secure the heater hoses (1) away from the intake manifold (2).

    7. Object Number: 1954084 Size: SH

    Important: Plug or cap the fuel feed pipe (2) and fuel rail tube (1) ends to prevent fuel leaks and/or contamination.

  7. Disconnect the fuel rail feed pipe (2) quick connect fitting. Refer to Metal Collar Quick Connect Fitting Service or Plastic Collar Quick Connect Fitting Service.

    8. Object Number: 1954083 Size: SH

    Important: Plug or cap the throttle body to EVAP purge valve hose (3) and EVAP purge valve (1) ends to prevent fuel leaks and/or contamination.

  8. Disconnect the throttle body to EVAP purge valve hose (3) from the EVAP purge valve (1).

    9. Important: Plug or cap the EVAP purge valve to fuel tank hose (2) and EVAP purge valve (1) ends to prevent fuel leaks and/or contamination.

  9. Disconnect the EVAP purge valve to fuel tank hose (2) from the EVAP purge valve (1).

    10. Object Number: 1954085 Size: SH
  10. Disconnect the electronic throttle body wiring harness connector (1).

    11. Object Number: 1954091 Size: SH
  11. Disconnect the (PCV) Positive Crankcase Ventilation hose (3) from the intake manifold (1) and the valley cover (2).

    12. Object Number: 1954089 Size: SH
  12. Disconnect the alternator wiring harness connector (1) from the alternator.

    13. Object Number: 1946557 Size: SH
  13. Compress the vacuum hose retaining clamp (2) at the intake manifold vacuum port (1) and slide 50 mm (2 in) back along the vacuum hose (3).
  14. Disconnect the vacuum hose (3) from the intake manifold vacuum port (1).

    15. Object Number: 1954090 Size: SH
  15. Disconnect the oil pressure sensor wiring harness connector (1) from the oil pressure sensor.
  16. Disconnect the HVAC vacuum hose (2) from the intake manifold.

    17. Object Number: 1954088 Size: SH
  17. Disconnect the camshaft position sensor connector (4) from the camshaft position sensor.
  18. Disconnect the coolant temperature sensor connector (3) from the coolant temperature sensor.
  19. Detach the wiring harness retaining clip (2) from the engine lifting bracket (1).

    20. Object Number: 1954086 Size: SH
  20. Disconnect the left side fuel injector wiring harness connectors (2) from the fuel injectors.
  21. Remove the Connector Position Assurance (CPA) lock (4) from the left side ignition coil main connector (3).
  22. Disconnect the left side ignition coil main connector (3) from the ignition coil wiring harness.
  23. Reposition and secure the left side fuel injector wiring harness (5) away from the intake manifold (1).

    24. Object Number: 1954087 Size: SH
  24. Disconnect the right side fuel injector wiring harness connectors (1) from the fuel injectors.
  25. Remove the CPA lock (7) from the right side ignition coil main connector (6).
  26. Disconnect the right side ignition coil main connector (6) from the ignition coil wiring harness.
  27. Disconnect the canister purge valve (5) wiring harness connector.
  28. Disconnect the manifold absolute pressure (MAP) sensor wiring harness connector (3) from the MAP sensor.
  29. Reposition and secure the right side fuel injector wiring harness (4) away from the intake manifold (2).
  30. Remove the intake manifold. Refer to Intake Manifold Removal.
  31. Clean and inspect the intake manifold. Refer to Intake Manifold Cleaning and Inspection.

Installation Procedure
  1. Install the intake manifold. Refer to Intake Manifold Installation.

    2. Object Number: 1954087 Size: SH
  2. Position the right side fuel injector wiring harness (4) on the intake manifold (2).
  3. Connect the Manifold Absolute Pressure (MAP) sensor wiring harness connector (3) to the MAP sensor.
  4. Connect the canister purge valve wiring harness connector (5).
  5. Connect the right side ignition coil main connector (6) to the ignition coil wiring harness.
  6. Install the Connector Position Assurance (CPA) lock (7) from the right side ignition coil main connector (6).
  7. Connect the right side fuel injector wiring harness connectors (1) to the fuel injectors.

    8. Object Number: 1954086 Size: SH
  8. Position the left side fuel injector wiring harness (5) back to its original location the intake manifold (1).
  9. Connect the left side ignition coil main connector (3) ignition coil wiring harness.
  10. Install the CPA lock (4) from the left side ignition coil main connector (3).
  11. Connect the left side fuel injector wiring harness connectors (2) to the fuel injectors.

    12. Object Number: 1954088 Size: SH
  12. Connect the camshaft position sensor connector (4) to the camshaft sensor.
  13. Connect the coolant temperature sensor connector (3) to the coolant sensor.
  14. Attach the wiring harness retaining clip (2) to the engine lifting bracket (1).

    15. Object Number: 1954090 Size: SH
  15. Connect the oil pressure sensor wiring harness connector (1) to the oil pressure sensor.
  16. Connect the HVAC vacuum hose (2) to the intake manifold.

    17. Object Number: 1946557 Size: SH
  17. Compress the vacuum hose retaining clamp (2) at the intake manifold vacuum port (1) and slide 50 mm (2 in) back along the vacuum hose (3).
  18. Connect the vacuum hose (3) to the intake manifold vacuum port (1).

    19. Object Number: 1954089 Size: SH
  19. Connect the alternator wiring harness connector (1) to the alternator.

    20. Object Number: 1954091 Size: SH
  20. Connect the PCV hose (3) to the intake manifold (1) and the valley cover (2).

    21. Object Number: 1954085 Size: SH
  21. Connect the electronic throttle body wiring harness connector (1) to the throttle body.

    22. Object Number: 1954083 Size: SH
  22. Remove the plug on the throttle body to EVAP purge valve hose (3) and EVAP purge valve (1) ends.
  23. Connect the throttle body to EVAP purge valve hose (3) to the EVAP purge valve (1).
  24. Remove the plug on the throttle body to the EVAP purge valve to fuel tank hose (2) and EVAP purge valve (1) ends.
  25. Connect the EVAP purge valve to fuel tank hose (2) to the EVAP purge valve (1).

    26. Object Number: 1954084 Size: SH
  26. Remove the plug on the fuel feed pipe (2) and fuel rail tube (1) end.
  27. Connect the fuel rail feed pipe (2) quick connect fitting. Refer to Metal Collar Quick Connect Fitting Service or Plastic Collar Quick Connect Fitting Service.

    28. Object Number: 1954082 Size: SH
  28. Position the heater hoses (1) correctly on the intake manifold (2).
  29. Install the air intake duct. Refer to Air Cleaner Inlet Duct Replacement.
  30. Fill the cooling system. Refer to Cooling System Draining and Filling.
  31. Connect the battery ground cable. Refer to Battery Negative Cable Disconnection and Connection.
  32. Run engine and check for leaks.
  33. Install the engine cover. Refer to Engine Cover Replacement.