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Home >> Cadillac >> 2004 >> CTS Base, 3.2 N >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Mechanical - 5.7L (LS6)) >> Repair Instructions >> On-Vehicle Repair Instructions >> Intake Manifold Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different variant/trim than selected.
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. Drain the cooling system. Refer to Draining and Filling Cooling System (LS6) in Engine Cooling.
  2. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure in Engine Controls - 5.7L.
  3. If replacing the intake manifold, perform the following:
    Fig 1: View Of Throttle Body
    GM43567Courtesy of GENERAL MOTORS CORP.
    4. Fig 2: Identifying Fuel Feed Hose (2)
    GM1392565Courtesy of GENERAL MOTORS CORP.
  4. Disconnect the fuel feed hose (2). Refer to Fuel Hose/Pipes Replacement - Engine Compartment in Engine Controls - 5.7L.
  5. Disconnect the evaporative emission (EVAP) canister purge tube from the intake manifold.
    Fig 3: Locating EVAP Canister Purge Tube
    GM651868Courtesy of GENERAL MOTORS CORP.
  6. Disconnect the EVAP canister purge tube from the EVAP canister purge solenoid valve.
  7. Remove the EVAP canister purge tube.
    8. Fig 4: Identifying EVAP Canister Purge Tubes
    GM1392565Courtesy of GENERAL MOTORS CORP.
  8. Disconnect the EVAP canister purge tube (4) from the EVAP canister purge solenoid valve.
  9. Disconnect the EVAP canister purge tube from the fuel feed pipe.
  10. Disconnect the EVAP canister purge tube from the rear of the right cylinder head (1).
  11. Remove the EVAP canister purge tube from under the fuel rail and remove the tube from the vehicle.
    12. Fig 5: Identifying TP Sensor Electrical Connector
    GM51808Courtesy of GENERAL MOTORS CORP.
  12. Disconnect the throttle position (TP) sensor electrical connector.
  13. Remove the coolant air bleed hose. Refer to Coolant Air Bleed Hose Replacement in Engine Cooling.
    14. Fig 6: View Of Throttle Body Heater Outlet Hose
    GM1392618Courtesy of GENERAL MOTORS CORP.
  14. Disconnect the throttle body outlet hose (1) from the throttle body.
  15. Position the throttle body outlet hose aside.
    16. Fig 7: Locating EVAP Canister Purge Solenoid Valve Electrical Connector
    GM651871Courtesy of GENERAL MOTORS CORP.
  16. Disconnect all the fuel injector electrical connectors (1).
  17. Disconnect the EVAP canister purge solenoid valve electrical connector (2).
  18. Disconnect the electronic throttle control (ETC) electrical connector (3).
    19. Fig 8: View Of EVAP Canister Purge Solenoid Valve & Bracket
    GM419407Courtesy of GENERAL MOTORS CORP.
  19. Remove the EVAP canister purge solenoid valve from the bracket.
  20. Disconnect the harness clips from the fuel rails.
  21. Reposition the intake manifold branches of the wiring harness.
    22. Fig 9: Identifying Vacuum Booster Hose
    GM63936Courtesy of GENERAL MOTORS CORP.
  22. Disconnect the power brake booster vacuum hose at the booster.
    23. Fig 10: Locating Knock Sensor Wire Harness Clip & Fuel Rail Stop Bracket
    GM639835Courtesy of GENERAL MOTORS CORP.
  23. Remove the knock sensor wire harness (1) clip from the fuel rail stop bracket (2).
    24. Fig 11: Identifying PCV Fresh Air Hose
    GM1392083Courtesy of GENERAL MOTORS CORP.
  24. Remove the TP sensor harness clip from the positive crankcase ventilation (PCV) tube.
  25. Remove the PCV tube from the right rocker arm cover and the throttle body.
    26. Fig 12: View Of Positive Crankcase Ventilation (PCV) Dirty Air Hose
    GM1392087Courtesy of GENERAL MOTORS CORP.
  26. Remove the PCV hose from the valley cover and intake manifold.
    27. Fig 13: Locating Fuel Rail Stop Bracket & Intake Manifold Bolts
    GM490927Courtesy of GENERAL MOTORS CORP.
  27. Remove the intake manifold bolts (1) and fuel rail stop bracket (2).
  28. Position the intake manifold forward.
  29. Disconnect the manifold absolute pressure (MAP) sensor vacuum hose.
  30. Disconnect the MAP sensor electrical connector.
    31. Fig 14: View Of Intake Manifold & Engine
    GM639836Courtesy of GENERAL MOTORS CORP.
  31. Remove the intake manifold.
    32. Fig 15: Identifying Intake Manifold Gaskets
    GM490579Courtesy of GENERAL MOTORS CORP.
  32. Remove and discard the intake manifold gaskets (1).
  33. Clean and inspect the intake manifold. Refer to Intake Manifold Cleaning and Inspection .
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