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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 >> Installation Procedure

Installation Procedure

WARNING: This page is about a different variant/trim than selected.
IMPORTANT: DO NOT reuse the intake manifold gaskets. Install NEW intake manifold gaskets.
    Fig 1: Identifying Intake Manifold Gaskets
    GM490579Courtesy of GENERAL MOTORS CORP.
  1. Install NEW intake manifold gaskets (1) to the intake manifold.
    2. Fig 2: View Of Intake Manifold & Engine
    GM639836Courtesy of GENERAL MOTORS CORP.
  2. Install intake manifold.
  3. Position the intake manifold forward.
  4. Connect the MAP sensor vacuum hose.
  5. Connect the MAP sensor electrical connector.
  6. Position the intake manifold into place.
    7. Fig 3: Locating Fuel Rail Stop Bracket & Intake Manifold Bolts
    GM490927Courtesy of GENERAL MOTORS CORP.
  7. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489), or equivalent to the threads of the intake manifold bolts (1).
    8. CAUTION: Refer to Fuel Rail Stop Bracket Installation Caution in Cautions and Notices.
  8. Install the fuel rail stop bracket (2).
  9. Install the intake manifold bolts (1).
    10. Fig 4: Identifying Intake Manifold Bolt Tightening Sequence
    GM63222Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  10. Tighten the intake manifold bolts.

    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 second pass in sequence to 10 N.m (89 lb in).

    11. Fig 5: View Of Positive Crankcase Ventilation (PCV) Dirty Air Hose
    GM1392087Courtesy of GENERAL MOTORS CORP.
  11. Install the PCV hose to the valley cover and intake manifold.
    12. Fig 6: Identifying PCV Fresh Air Hose
    GM1392083Courtesy of GENERAL MOTORS CORP.
  12. Install the PCV tube to the right rocker arm cover and the throttle body.
  13. Install the TP sensor harness clip to the PCV tube.
    14. Fig 7: Locating Knock Sensor Wire Harness Clip & Fuel Rail Stop Bracket
    GM639835Courtesy of GENERAL MOTORS CORP.
  14. Install the knock sensor wire harness (1) clip to the fuel rail stop bracket (2).
    15. Fig 8: Identifying Vacuum Booster Hose
    GM63936Courtesy of GENERAL MOTORS CORP.
  15. Connect the power brake booster vacuum hose to the booster.
    16. Fig 9: View Of EVAP Canister Purge Solenoid Valve & Bracket
    GM419407Courtesy of GENERAL MOTORS CORP.
  16. Connect the harness clips to the fuel rails.
  17. Install the EVAP canister purge solenoid valve to the bracket.
    18. Fig 10: Locating EVAP Canister Purge Solenoid Valve Electrical Connector
    GM651871Courtesy of GENERAL MOTORS CORP.
  18. Connect the ETC electrical connector (3).
  19. Connect the EVAP canister purge solenoid valve electrical connector (2).
  20. Connect the fuel injector electrical connectors (1).
    21. Fig 11: View Of Throttle Body Heater Outlet Hose
    GM1392618Courtesy of GENERAL MOTORS CORP.
  21. Connect the throttle body outlet hose (1) to the throttle body.
    22. Fig 12: Identifying TP Sensor Electrical Connector
    GM51808Courtesy of GENERAL MOTORS CORP.
  22. Install the coolant air bleed hose. Refer to Coolant Air Bleed Hose Replacement in Engine Cooling.
  23. Connect the TP sensor electrical connector.
    24. Fig 13: Identifying EVAP Canister Purge Tubes
    GM1392565Courtesy of GENERAL MOTORS CORP.
  24. Install the EVAP canister purge tube under the fuel rail.
  25. Connect the EVAP canister purge tube at the rear of the right cylinder head (1).
  26. Connect the EVAP canister purge tube to the fuel feed pipe.
  27. Connect the EVAP canister purge tube (4) to the EVAP canister purge solenoid valve.
    28. Fig 14: View Of Throttle Body
    GM43567Courtesy of GENERAL MOTORS CORP.
  28. If previously removed, install the fuel injectors. Refer to Fuel Injector Replacement in Engine Controls - 5.7L.
  29. Connect the fuel feed hose. Refer to Fuel Hose/Pipes Replacement - Engine Compartment in Engine Controls - 5.7L.
  30. If previously removed, install the throttle body. Refer to Throttle Body Assembly Replacement in Engine Controls - 5.7L.
  31. Fill the cooling system. Refer to Draining and Filling Cooling System (LS6) in Engine Cooling.
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