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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1121 (Engine Mechanical - 3.4L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Intake Manifold Replacement - Lower >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the upper intake manifold. Refer to Intake Manifold Replacement - Upper .
  2. Remove the engine left side valve rocker arm cover. Refer to Valve Rocker Arm Cover Replacement - Left .
  3. Remove the engine right side valve rocker arm cover. Refer to Valve Rocker Arm Cover Replacement - Right .
    4. Fig 1: ECT Sensor Electrical Connector
    GM190517Courtesy of GENERAL MOTORS CORP.
  4. Disconnect the wiring harness from the engine coolant temperature (ECT) sensor.
    5. Fig 2: Locating Fuel Injector, Manifold Air Pressure (MAP) & ECT Wiring Harness
    GM261255Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Use masking tape or another appropriate method in order to identify each fuel injector wiring harness connector cylinder number.
  5. Disconnect and remove the fuel injector, manifold air pressure (MAP) and ECT wiring harness.
  6. Remove the fuel feed and return pipe from the fuel injector rail. Refer to Fuel Hose/Pipes Replacement - Engine Compartment in Engine Controls-3.4L.
    7. Fig 3: Fuel Feed & Return Pipe Retaining Clip
    GM187065Courtesy of GENERAL MOTORS CORP.
  7. Remove the fuel feed and return pipe retaining clip bolt.
  8. Remove the fuel feed and return pipe retaining clip.
    9. Fig 4: View Of Fuel Injector Rail Assembly
    GM862487Courtesy of GENERAL MOTORS CORP.
  9. Remove the fuel injector rail bolts.
  10. Remove the fuel injector rail with the fuel injectors.
    11. IMPORTANT: Do NOT disconnect the power steering pipes or hoses from the power steering pump.
  11. Remove the power steering pump from the front engine cover and reposition. Refer to Power Steering Pump Replacement (LA1 ) in Power Steering System.
  12. Disconnect the heater inlet pipe with heater hose from the lower intake manifold and reposition. Refer to Heater Pipe Replacement - Inlet in Heating, Ventilation and Air Conditioning.
  13. Disconnect the inlet radiator hose from the engine. Refer to Radiator Hose Replacement - Inlet (LA1) in Engine Cooling.
    14. Fig 5: Identifying Thermostat Bypass Hose
    GM261263Courtesy of GENERAL MOTORS CORP.
  14. Disconnect the thermostat bypass hose from the lower intake manifold pipe.
    15. Fig 6: View Of Lower Intake Manifold Bolts
    GM261264Courtesy of GENERAL MOTORS CORP.
  15. Remove the lower intake manifold bolts.
    16. Fig 7: Identifying Lower Intake Manifold
    GM261265Courtesy of GENERAL MOTORS CORP.
  16. Remove the lower intake manifold.
  17. Loosen the valve rocker arms and remove the push rods. Refer to Valve Rocker Arm and Push Rod Removal .
  18. Remove the lower intake manifold gaskets and seals.
  19. Clean the lower intake manifold gasket and seal surfaces on the cylinder heads and the engine block.
  20. Clean and inspect the lower intake manifold. Refer to Intake Manifold Cleaning and Inspection - Lower .
  21. If you are replacing the lower intake manifold, perform the following steps:
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