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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1243 (Engine Mechanical - 3.1L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Intake Manifold Replacement - Lower >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the negative battery cable. Refer to BATTERY NEGATIVE CABLE DISCONNECT/CONNECT PROCEDURE in Battery.
  2. Remove the upper intake manifold. Refer to INTAKE MANIFOLD REPLACEMENT - UPPER  .
  3. Remove the left valve rocker arm cover. Refer to VALVE ROCKER ARM COVER REPLACEMENT - LEFT  .
  4. Remove the right valve rocker arm cover. Refer to VALVE ROCKER ARM COVER REPLACEMENT - RIGHT  .
  5. Disconnect the engine coolant temperature (ECT) sensor electrical connector.
    Fig 1: Disconnecting Engine Coolant Temperature (ECT) Sensor Electrical Connector
    G02081376Courtesy of GENERAL MOTORS CORP.
  6. Disconnect and remove the fuel injector and the manifold absolute pressure (MAP) sensor wiring harnesses.
    Fig 2: Removing Manifold Absolute Pressure (MAP) Sensor Wiring Harnesses
    G02081377Courtesy of GENERAL MOTORS CORP.
  7. Remove the fuel pipe clip bolt.
    Fig 3: Removing Fuel Pipe Clip Bolt
    G02081378Courtesy of GENERAL MOTORS CORP.
  8. Remove the fuel pipe clip.
    Fig 4: Removing Fuel Pipe Clip
    G02081379Courtesy of GENERAL MOTORS CORP.
  9. Remove the fuel feed pipe from the fuel injector rail.
    Fig 5: Removing Fuel Feed Pipe From Fuel Injector Rail
    G02081380Courtesy of GENERAL MOTORS CORP.
  10. Remove the fuel return pipe from the fuel injector rail.
    Fig 6: Removing Fuel Return Pipe From Fuel Injector Rail
    G02081381Courtesy of GENERAL MOTORS CORP.
  11. Remove the fuel injector rail. Refer to FUEL RAIL & INJECTORS in Engine Performance - Removal and Installation.
  12. Remove the power steering pump from the front engine cover and reposition. Refer to POWER STEERING PUMP REPLACEMENT (3.1L) in Power Steering System.
    Fig 7: Removing Fuel Injector Rail
    G02081382Courtesy of GENERAL MOTORS CORP.
  13. Remove the heater inlet pipe nut.
  14. Remove the heater inlet pipe with heater hose from the lower intake manifold and reposition.
  15. Remove the radiator inlet hose from the engine. Refer to RADIATOR HOSE REPLACEMENT - INLET (3.1 L) in Engine Cooling.
    Fig 8: Removing Radiator Inlet Hose From Engine
    G02081383Courtesy of GENERAL MOTORS CORP.
  16. Remove the thermostat bypass hose from the thermostat bypass pipe and lower intake manifold pipe.
    Fig 9: Removing Thermostat Bypass Hose From Thermostat Bypass Pipe And Lower Intake Manifold Pipe
    G02081384Courtesy of GENERAL MOTORS CORP.
  17. Remove the lower intake manifold bolts.
  18. Remove the lower intake manifold.
  19. Remove the valve rocker arms and pushrods. Refer to VALVE ROCKER ARM AND PUSH ROD REPLACEMENT  .
    Fig 10: Removing Lower Intake Manifold
    G02081385Courtesy of GENERAL MOTORS CORP.
  20. Remove the lower intake manifold gaskets and seals.
  21. Clean the lower intake manifold gasket mating surfaces.
  22. Remove and clean all the RTV sealant from the lower intake manifold and the engine block (1).
    Fig 11: Removing Lower Intake Manifold Gaskets And Seals
    G02081386Courtesy of GENERAL MOTORS CORP.
  23. Remove the ECT sensor.
    Fig 12: Removing ECT Sensor
    G02081387Courtesy of GENERAL MOTORS CORP.
  24. Remove the water outlet bolts.
  25. Remove the water outlet.
    Fig 13: Removing Water Outlet
    G02081388Courtesy of GENERAL MOTORS CORP.
  26. Remove the thermostat.
    Fig 14: Removing Thermostat
    G02081389Courtesy of GENERAL MOTORS CORP.
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