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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1018 (Engine Mechanical - 4.3L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Intake Manifold Replacement - Lower >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 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 Draining and Filling Cooling System (without HP2) in Engine Cooling.
  2. Remove the fuel pipes/hoses. Refer to Fuel Hose/Pipes Replacement - Engine Compartment in Engine Controls - 4.3L.
  3. Remove the distributor. Refer to Distributor Replacement in Engine Controls - 4.3L.
  4. Disconnect the evaporative emission (EVAP) canister harness from the purge solenoid valve.
    5. Fig 1: Disconnecting EVAP Canister Harness
    GM869711Courtesy of GENERAL MOTORS CORP.
  5. Remove the heater hose clamp (1).
    6. Fig 2: Removing Heater Hose Clamp
    GM869718Courtesy of GENERAL MOTORS CORP.
  6. Open the heater outlet hose clamp and remove the hose from the intake manifold.
    7. Fig 3: Removing Intake Manifold Hose
    GM869717Courtesy of GENERAL MOTORS CORP.
  7. Open the heater inlet hose clamp and remove the hose from the water pump.
    8. Fig 4: Removing Heater Inlet Hose From Water Pump
    GM869714Courtesy of GENERAL MOTORS CORP.
  8. Reposition the heater inlet and outlet hoses.
  9. Disconnect the cruise control cable from the throttle body lever, if equipped.
  10. Remove the cruise control cable from the accelerator control cable bracket, if equipped.
    11. Fig 5: Removing Cruise Control Cable
    GM781993Courtesy of GENERAL MOTORS CORP.
  11. Remove the accelerator cable from the throttle body lever.
    12. Fig 6: Removing Accelerator Cable From Throttle Body Lever
    GM781992Courtesy of GENERAL MOTORS CORP.
  12. Remove the accelerator cable from the accelerator control cable bracket.
    13. Fig 7: View Of Accelerator Cable To Accelerator Control Cable Bracket
    GM781990Courtesy of GENERAL MOTORS CORP.
  13. Disconnect the following electrical connectors:
    • The air conditioning (A/C) compressor clutch (1), if equipped
    • The A/C pressure switch (4), if equipped
  14. Remove the engine wiring harness clip (3) from the accelerator control cable bracket.
    15. Fig 8: A/C Compressor Clutch, Pressure Switch & Engine Wiring Harness Clip
    GM782175Courtesy of GENERAL MOTORS CORP.
  15. Remove the accelerator control cable bracket nuts.
  16. Remove the accelerator control cable bracket with the cables attached, from the throttle body.
    17. Fig 9: View Of Accelerator Control Cable Bracket
    GM398030Courtesy of GENERAL MOTORS CORP.
  17. Reposition and secure the bracket and cables out of the way.
  18. Disconnect the following electrical connectors:
    • The throttle position (TP) sensor (1)
    • The idle air control (IAC) motor (2)
    • The control port injector module (3)
  19. Remove the engine wiring harness clip bolt (4).
    20. Fig 10: View Of TP Sensor, IAC Motor, ECT Sensor, Control Port Injector Module & Engine Harness Clip Bolt
    GM782174Courtesy of GENERAL MOTORS CORP.
  20. Disconnect the following electrical connectors:
    • The evaporative emission (EVAP) canister purge solenoid valve (1)
    • The manifold absolute pressure (MAP) sensor (2)
    21. Fig 11: EVAP Canister Purge Solenoid Valve & MAP Sensor
    GM782178Courtesy of GENERAL MOTORS CORP.
  21. Remove the engine wiring harness bracket nuts.
  22. Remove the engine wiring harness bracket.
    23. Fig 12: Removing Engine Wiring Harness Bracket
    GM310241Courtesy of GENERAL MOTORS CORP.
  23. Remove the engine wiring harness ground nut and ground wire (4) from the rear of the right cylinder head.
    24. Fig 13: Ignition Coil, Ignition Coil Driver, Ground Nut/Cable & Generator Electrical Connectors
    GM782177Courtesy of GENERAL MOTORS CORP.
  24. Remove the engine wiring harness rear bracket nut at the EVAP canister purge solenoid valve.
  25. Remove the stud holding the engine wiring harness bracket.
  26. Reposition the engine wiring harness with the bracket aside.
    27. Fig 14: Engine Wiring Harness Bracket Stud & Rear Bracket Nut
    GM782176Courtesy of GENERAL MOTORS CORP.
  27. Remove the PCV valve hose from the valve cover and rocker cover.
    28. Fig 15: Removing PCV Valve Hose
    GM869710Courtesy of GENERAL MOTORS CORP.
  28. Disconnect the power brake booster vacuum hose from the vacuum fitting.
    29. Fig 16: Disconnecting Power Brake Booster Vacuum Hose
    GM869713Courtesy of GENERAL MOTORS CORP.
  29. Reposition the radiator inlet hose clamps.
  30. Remove the radiator inlet hose from the thermostat housing.
    31. Fig 17: Removing Radiator Inlet Hose
    GM367002Courtesy of GENERAL MOTORS CORP.
  31. Reposition the water pump inlet hose clamps.
  32. Remove the water pump inlet hose.
    33. Fig 18: View Of Water Pump Inlet Hose & Clamps
    GM182853Courtesy of GENERAL MOTORS CORP.
  33. 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.
    34. Fig 19: View Of Power Steering Pump Bracket
    GM340090Courtesy of GENERAL MOTORS CORP.
  34. Remove the intake manifold - lower bolts.
  35. Remove the intake manifold.
    36. Fig 20: Removing Intake Manifold
    GM869728Courtesy of GENERAL MOTORS CORP.
  36. Remove and discard the intake manifold gaskets.
  37. Clean and inspect the intake manifold - lower, if necessary. Refer to Intake Manifold Cleaning and Inspection .
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