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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 948 (Engine Mechanical - 4.3L) >> Repair Instructions - On Vehicle >> Lower Intake Manifold Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
  • The intake manifold may be removed as an assembly. Do not remove the specific intake manifold components unless component service is required.
  • It is not necessary to remove the upper intake manifold in order to remove the lower intake manifold.
  • Do not allow dirt or debris to enter the fuel system. Ensure that the ends of the fuel system are properly sealed.
  • Do not disassemble the central sequential fuel injection (SFI) unit, unless service is required.
  1. Drain the cooling system. Refer to Cooling System Draining and Filling (Static Fill) or Cooling System Draining and Filling (Vac-N-Fill) .
  2. Remove the fuel pipes/hoses. Refer to Fuel Hose/Pipes Replacement - Engine Compartment .
  3. Remove the ignition coil assembly. Refer to Ignition Coil Replacement .
  4. Remove the evaporative emission (EVAP) canister tube. Refer to Evaporative Emission Hoses/Pipes Replacement - Engine .
    5. Fig 1: Heater Hose Clamp
    GM869718Courtesy of GENERAL MOTORS CORP.
  5. Remove the heater hose clamp (1).
    6. Fig 2: Intake Manifold Hose
    GM869717Courtesy of GENERAL MOTORS CORP.
  6. Open the heater outlet hose clamp and remove the hose from the intake manifold.
    7. Fig 3: Heater Inlet Hose At Water Pump
    GM869714Courtesy of GENERAL MOTORS CORP.
  7. Open the heater inlet hose clamp and remove the hose from the water pump.
  8. Reposition the heater inlet and outlet hoses.
    9. Fig 4: View Of Engine Wiring Harness & Components
    GM1876492Courtesy of GENERAL MOTORS CORP.
  9. Disconnect the engine wiring harness electrical connector (2) from the throttle body.
    10. Fig 5: View Of A/C Pressure Switch & Compressor Clutch Connectors
    GM1878341Courtesy of GENERAL MOTORS CORP.
  10. Disconnect the following electrical connectors:
    • The A/C pressure switch (1), if equipped
    • The air conditioning (A/C) compressor clutch (2), if equipped
    11. Fig 6: Control Port Injector Module
    GM1878388Courtesy of GENERAL MOTORS CORP.
  11. Disconnect the control port injector module (1).
    12. Fig 7: View Of Engine Wiring Harness & Components
    GM1876492Courtesy of GENERAL MOTORS CORP.
  12. Disconnect the following electrical connectors:
    • The EVAP canister purge solenoid valve (1)
    • The manifold absolute pressure (MAP) sensor
    13. Fig 8: Oil Pressure Sensor Electrical Connector & Clamp
    GM1878421Courtesy of GENERAL MOTORS CORP.
  13. Remove the engine harness clamp (1) from the bracket.
  14. Disconnect the oil pressure sensor electrical connector (2).
    15. Fig 9: Engine Wiring Harness Bracket Bolt
    GM1878486Courtesy of GENERAL MOTORS CORP.
  15. Remove the engine wiring harness bracket bolt (1).
    16. Fig 10: Engine Wiring Harness Ground Nut
    GM1878506Courtesy of GENERAL MOTORS CORP.
  16. Remove the engine wiring harness ground nut and ground wire (1) from the rear of the right cylinder head.
    17. Fig 11: Engine Wiring Harness Bracket Stud
    GM1878512Courtesy of GENERAL MOTORS CORP.
  17. Remove the stud (1) holding the engine wiring harness bracket.
  18. Reposition the engine wiring harness with the bracket aside.
    19. Fig 12: Locating PCV Valve Hose At Valve & Rocker Cover
    GM869710Courtesy of GENERAL MOTORS CORP.
  19. Remove the positive crankcase ventilation (PCV) valve hose from the valve cover and rocker cover.
  20. Disconnect the power brake booster vacuum hose from the vacuum fitting.
    21. Fig 13: View Of Radiator Inlet Hose, Clamps & Thermostat Housing
    GM367002Courtesy of GENERAL MOTORS CORP.
  21. Reposition the radiator inlet hose clamps.
  22. Remove the radiator inlet hose from the thermostat housing.
    23. Fig 14: View Of Water Pump Inlet Hose & Clamps
    GM182853Courtesy of GENERAL MOTORS CORP.
  23. Reposition the water pump inlet hose clamps.
  24. Remove the water pump inlet hose.
    25. Fig 15: View Of Power Steering Pump Bracket
    GM340090Courtesy of GENERAL MOTORS CORP.
  25. In order to remove the front intake manifold bolt, perform the following:
    1. Remove the drive belt. Refer to Drive Belt Replacement .
    2. Loosen the power steering (P/S) pump rear bracket nut.
    3. Remove the P/S pump rear bracket front nut.
    4. Remove the bolts and the nut for the P/S pump bracket.
    5. Leave the A/C compressor, if equipped, and the P/S pump on the bracket.
    6. Slide the P/S pump bracket forward to access the front intake manifold bolt.
    26. Fig 16: Intake Manifold
    GM869728Courtesy of GENERAL MOTORS CORP.
  26. Remove the intake manifold - lower bolts.
  27. Remove the intake manifold.
  28. Remove and discard the intake manifold gaskets.
  29. Clean and inspect the intake manifold - lower, if necessary. Refer to Intake Manifold Cleaning and Inspection .
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