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Home › Cadillac › 2003 › CTS Standard › Repair and Diagnosis › Engine Mechanical › Engine Mechanical - 3.2L › Repair Instructions › On-Vehicle Repair Instructions › Intake Plenum Replacement › Removal Procedure

Removal Procedure

  1. Remove the intake plenum air inlet hose clamps and hoses from the throttle body.
  2. Disconnect the fuel pressure regulator atmospheric vent tube from the bottom of the throttle body.
    Fig 1: Removing Intake Plenum Air Inlet Hoses & Clamps
    G02085842Courtesy of GENERAL MOTORS CORP.
  3. Remove the bolts securing the throttle body to the intake plenum.
    Fig 2: Removing Bolts Securing Throttle Body To Intake Plenum
    G02085843Courtesy of GENERAL MOTORS CORP.
  4. Remove the throttle body from the intake plenum and crankcase vent adapter, allowing it to be supported by the throttle body inlet heater hose.
  5. Remove the throttle body O-ring seals.
  6. Remove the 3 bolts securing the crankcase vent adapter to the intake plenum.
    7. Fig 3: Removing Crankcase Vent Adapter & Mounting Bolts
    G02085844Courtesy of GENERAL MOTORS CORP.
  7. Lift the crankcase vent adapter from the intake plenum, and position aside.
  8. Disconnect the vacuum brake booster hose retainer (1) from the rear of the intake plenum-RHD only.
  9. Disconnect the crankcase ventilation dirty air hose retainer (2) from the fuel pipe.
    Fig 4: Removing Vacuum Brake Booster Hose Retainer
    G02085845Courtesy of GENERAL MOTORS CORP.
  10. Remove the remote power steering fluid reservoir mounting bolts (1, 3) ONLY, and position aside.
    Fig 5: Removing Remote Power Steering Fluid Reservoir Mounting Bolts
    G02085846Courtesy of GENERAL MOTORS CORP.
  11. Disconnect the electrical connector (1) and vacuum hose (2) from the switchover valve at the rear of the plenum.
    Fig 6: Disconnecting Switchover Valve Electrical Connector & Vacuum Hose
    G02085847Courtesy of GENERAL MOTORS CORP.
  12. Remove the bolt (1) securing the throttle body heater inlet hose/pipe to the intake plenum (2).
  13. Disconnect the vacuum brake booster hose (3) from the vacuum source.
    Fig 7: Removing Throttle Body Heater Inlet Hose Mounting Bolt & Brake Booster Hose
    G02085848Courtesy of GENERAL MOTORS CORP.
  14. Remove the 2 bolts securing the engine control module (ECM) bracket to the intake plenum.
    Fig 8: Removing Engine Control Module (ECM) Bracket & Retaining Bolts
    G02085849Courtesy of GENERAL MOTORS CORP.
  15. Remove the intake plenum bolt caps.
  16. Remove the intake plenum bolts.
  17. Lift the intake plenum from the intake manifold.
  18. Remove the intake plenum O-ring seals.
  19. Mask off the open ports to the intake manifold, in order to prevent foreign objects from entering the engine.
    Fig 9: Removing Intake Plenum Bolts & Caps
    G02085850Courtesy of GENERAL MOTORS CORP.
  20. Disassemble the intake plenum if necessary. Refer to INTAKE PLENUM MANIFOLD DISASSEMBLE .
  21. Clean and inspect the intake plenum. Refer to INTAKE PLENUM MANIFOLD CLEANING AND INSPECTION .
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