GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2007 🢒 CTS 🢒 Engine 🢒 Engine Mechanical - 6.0L 🢒 Intake Manifold Replacement

Removal Procedure

    Object Number: 63936 Size: SH

    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 sight shield. Refer to Upper Intake Manifold Sight Shield Replacement .
  2. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
  3. Disconnect the fuel injector electrical connectors.
  4. Disconnect the throttle body electrical connector.
  5. Relieve the fuel system pressure. Refer to Fuel Pressure Relief .
  6. Remove the engine compartment fuel feed pipe. Refer to Fuel Hose/Pipes Replacement - Engine Compartment .
  7. Remove the fuel rail if necessary. Refer to Fuel Injector and Fuel Rail Replacement .
  8. Remove the vacuum hose from the intake manifold. Position the hose aside.

    9. Object Number: 1408858 Size: SH
  9. Disconnect the electrical connector from the manifold absolute pressure (MAP) sensor.
  10. Remove the MAP sensor (714).
  11. Remove the grommet (715) from the sensor, as required.

    12. Object Number: 1408859 Size: SH
  12. Remove the evaporative emission (EVAP) clip (740), bolt (742), bracket (741), valve (730), and tubes (729, 735).

    13. Object Number: 1408860 Size: SH
  13. Remove the intake manifold bolts (512) and fuel rail stop bracket (712).
  14. Remove the intake manifold (500).

    15. Object Number: 1272799 Size: SH
  15. Remove and discard the intake manifold gaskets (514).
  16. Disassemble the intake manifold as necessary. Refer to the appropriate procedures.
  17. Clean and inspect the intake manifold if it is not being replaced. Refer to Intake Manifold Cleaning and Inspection .

Installation Procedure

    Object Number: 1272799 Size: SH

    Important: DO NOT reuse the intake manifold gaskets. Install NEW intake manifold gaskets.

    Important: 

       • The intake manifold, throttle body, fuel injection rail and fuel injectors may be removed as an assembly. If not servicing the individual components, install the intake manifold as a complete assembly.
       • DO NOT use the intake manifold gaskets again. Install NEW intake manifold-to-cylinder head gaskets.

  1. Install NEW intake manifold-to-cylinder head gaskets (514).

    2. Object Number: 1408860 Size: SH
  2. Install the intake manifold (500).
  3. Apply a 5 mm (0.20 in) band of threadlocker 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: 63222 Size: SH
  4. Install the fuel rail stop bracket (712).
  5. Install the intake manifold bolts (512).

    6. Tighten

        • First Pass: Tighten the intake manifold bolts in sequence to 5 N·m (44 lb in).
        • Final Pass: Tighten the intake manifold bolts in sequence to 10 N·m (89 lb in).

    Object Number: 1408858 Size: SH
  6. Lubricate the MAP sensor grommet (715) with clean engine oil.
  7. Install the MAP sensor (714) and grommet (715).

    8. Object Number: 1408859 Size: SH
  8. Install the EVAP valve (730), bracket (741), and bolt (742).

    9. Tighten
    Tighten the bolt to 50 N·m (37 lb ft).

  9. Install the EVAP tubes (729, 735).
  10. If previously removed, install the fuel rail. Refer to Fuel Injector and Fuel Rail Replacement .
  11. Connect the MAP sensor electrical connector.

    12. Object Number: 63936 Size: SH
  12. Install the brake booster vacuum hose to the intake manifold.
  13. Connect the throttle body electrical connector.
  14. Connect the fuel injector electrical connectors.
  15. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
  16. Install the engine sight shield. Refer to Upper Intake Manifold Sight Shield Replacement .