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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 906 (Engine Mechanical - 4.3L (LU3)) >> Repair Instructions >> On-Vehicle Repair Instructions >> Engine Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If the engine is damaged internally and a new engine assembly is installed in the vehicle, ensure that all foreign material is flushed out of the cooling system. You must also flush out the oil cooler system. Failure to rid the oil cooler system of debris can result in engine damage.
  1. Disconnect the negative battery cable. Refer to BATTERY NEGATIVE CABLE DISCONNECT/CONNECT PROCEDURE in Battery.
  2. Drain the cooling system. Refer to DRAINING AND FILLING COOLING SYSTEM in Engine Cooling.
    Fig 1: Removing Cooling System
    G01977649Courtesy of GENERAL MOTORS CORP.
  3. Drain the engine oil. Refer to Engine Oil and Oil Filter Replacement   .
  4. Remove the hood. Refer to HOOD REPLACEMENT in Body Front End.
  5. Raise and support the vehicle. Refer to JACKING AND LIFTING in General Information.
  6. Remove the underbody shields, if equipped.
  7. Remove the exhaust pipe from the exhaust manifolds. Refer to EXHAUST MANIFOLD PIPE REPLACEMENT in Engine Exhaust.
  8. Remove the engine oil cooler pipes. Refer to ENGINE OIL COOLER HOSE/PIPE REPLACEMENT (2WD) or ENGINE OIL COOLER HOSE/PIPE REPLACEMENT (4WD) in Engine Cooling.
  9. Remove the stud holding the starter wire harness and if equipped, transmission oil cooler lines.
  10. Remove the starter. Refer to STARTER MOTOR in Starter.
  11. Remove the transmission cover.
  12. Remove the transmission.
  13. Remove the front engine mount through bolts.
  14. Lower the vehicle.
    Fig 3: Removing Front Engine Mount Through Bolts
    G01977651Courtesy of GENERAL MOTORS CORP.
  15. Remove the PCV tube from the right valve rocker arm cover and the air cleaner outlet duct.
    Fig 4: Removing PCV Tube
    G01977652Courtesy of GENERAL MOTORS CORP.
  16. Disconnect the breather tube at the air cleaner outlet duct.
    Fig 5: Disconnecting Breather Tube
    G01977653Courtesy of GENERAL MOTORS CORP.
  17. Remove the air cleaner outlet duct retaining wingnut.
    Fig 6: Removing Air Cleaner Outlet Duct Retaining Wingnut
    G01977654Courtesy of GENERAL MOTORS CORP.
  18. Disconnect the intake air temperature (IAT) sensor harness connector.
    Fig 7: Disconnecting IAT Sensor Harness Connector
    G01977655Courtesy of GENERAL MOTORS CORP.
  19. Remove the air cleaner outlet duct from the throttle body.
    Fig 8: Removing Air Cleaner Outlet Duct
    G01977656Courtesy of GENERAL MOTORS CORP.
    CAUTION: In order to avoid possible injury or vehicle damage, always replace the accelerator control cable with a NEW cable whenever you remove the engine from the vehicle.
    In order to avoid cruise control cable damage, position the cable out of the way while you remove or install the engine. Do not pry or lean against the cruise control cable and do not kink the cable. You must replace a damaged cable.
  20. Disconnect the accelerator cable from the throttle body.
    Fig 9: Disconnecting Accelerator Cable
    G01977657Courtesy of GENERAL MOTORS CORP.
  21. Remove the accelerator cable from the accelerator control cable bracket.
  22. Remove the cruise control cable, if equipped from the throttle shaft and the accelerator cable bracket. Refer to CRUISE CONTROL CABLE REPLACEMENT (4.3L) in Cruise Control.
  23. Remove the radiator. Refer to RADIATOR REPLACEMENT (4.3L) in Engine Cooling.
  24. Remove the inlet and outlet radiator hoses from the engine. Refer to RADIATOR HOSE REPLACEMENT - INLET (4.3L) and RADIATOR HOSE REPLACEMENT - OUTLET (4.3L) in Engine Cooling.
    Fig 10: Removing Accelerator Cable
    G01977658Courtesy of GENERAL MOTORS CORP.
  25. Disconnect the heater hoses from the engine. Refer to HEATER HOSE REPLACEMENT - INLET (4.3L) and HEATER HOSE REPLACEMENT - OUTLET (4.3L) in Heating, Ventilation and Air Conditioning.
  26. Disconnect the power brake booster vacuum hose from the intake manifold.
  27. Disconnect the vacuum hose for the A/C system, if equipped from the intake manifold.
    Fig 11: Disconnecting A/C Vacuum Hose
    G01977659Courtesy of GENERAL MOTORS CORP.
  28. Disconnect the following electrical connectors:
    • The A/C compressor clutch (1), if equipped
    • The A/C compressor cutoff switch (5), if equipped
    • The TP sensor (2)
    • The IAC valve motor (3)
    • The ECT sensor (4)
      Fig 12: Disconnecting Electrical Connectors
      G01977660Courtesy of GENERAL MOTORS CORP.
  29. 29. Disconnect the following electrical connectors
    • The fuel meter body (1)
    • The EVAP canister purge solenoid (2)
    • The MAP sensor (3)
      Fig 13: Disconnecting Electrical Connectors
      G01977661Courtesy of GENERAL MOTORS CORP.
  30. Disconnect the following electrical connectors:
    • The ICM (1)
    • The ignition coil (2)
    • The generator (4)
      Fig 14: Disconnecting Electrical Connectors
      G01977662Courtesy of GENERAL MOTORS CORP.
  31. Disconnect the following electrical connectors:
    • The distributor (1)
    • The engine oil pressure sensor (2)
    • The knock sensor (3)
      Fig 15: Disconnecting Electrical Connectors
      G01977663Courtesy of GENERAL MOTORS CORP.
  32. Disconnect the CKP sensor (2) electrical connector.
  33. Remove the bolt and the battery negative cable (1).
  34. Remove the engine wiring harness bracket bolt (3).
  35. Remove the engine wiring harness clips from the front of the engine.
  36. Remove the engine wiring harness clips from the brackets.
  37. Move the engine wiring harness aside.
  38. Remove the generator. Refer to GENERATOR in Generators and Regulators.
    Fig 16: Removing Battery Negative Cable, Engine Wiring Harness Bracket, & CKP Sensor
    G01977664Courtesy of GENERAL MOTORS CORP.
  39. Remove the bolt holding the ground wires to the left cylinder head.
  40. Remove the bolt holding the fuel pipe bracket to the rear of left cylinder head.
    Fig 17: Identifying Ground Wires to Left Cylinder Head Bolt
    G01977665Courtesy of GENERAL MOTORS CORP.
  41. Remove the bolts holding the ground wires to the right cylinder head.
    Fig 18: Removing Ground Wires to Right Cylinder Head Bolt
    G01977666Courtesy of GENERAL MOTORS CORP.
  42. Remove the bolt holding the ground strap to the right cylinder head.
    Fig 19: Removing Ground Strap to Right Cylinder Head Bolt
    G01977667Courtesy of GENERAL MOTORS CORP.
  43. Remove the accelerator control cable bracket from the throttle body.
  44. Remove the water pump pulley. Refer to WATER PUMP REPLACEMENT (4.3L) in Engine Cooling.
  45. Remove the A/C compressor, if equipped. Refer to COMPRESSOR REPLACEMENT (4.3L) in Heating, Ventilation, and Air Conditioning.
    Fig 20: Removing Accelerator Control Cable Bracket
    G01977668Courtesy of GENERAL MOTORS CORP.
  46. Remove the nuts holding the power steering pump rear bracket to the engine.
  47. Remove the power steering pump mounting bracket.
    • The power steering pump can remain on the mounting bracket.
    • The hoses do not require removal.
    • Remove the three bolts and the nut.
    • Slide the mounting bracket off of the stud.
    • Secure the mounting bracket out of the way.
  48. Remove the distributor cap. Refer to DISTRIBUTOR in Removal and Installation in Engine Performance.
  49. Disconnect the fuel pipes at the rear of the intake manifold.
  50. Disconnect the EVAP canister purge solenoid valve pipe.
  51. Remove the water outlet. Refer to THERMOSTAT REPLACEMENT (4.3L) in Engine Cooling.
    Fig 21: Removing Water Outlet
    G01977669Courtesy of GENERAL MOTORS CORP.
    52. NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  52. Attach the J 41427  to the left front and the right rear intake manifold mounting bolts, using the following procedure:
    1. 52.1. Remove the right rear lower intake manifold bolts.
    2. 52.2. Install the J 41427  marked RIGHT REAR.
    3. 52.3. Install the retaining bolts.
    4. 52.4. Remove the left front lower intake manifold bolts.
    5. 52.5. Install the J 41427  marked LEFT FRONT with the arrow pointing to the front of the engine.
    6. 52.6. Install the retaining bolts.

      Tighten 

      Tighten the retaining bolts to 15 N.m (11 lb ft).

      Fig 22: Using J 41427
      G01977670Courtesy of GENERAL MOTORS CORP.
  53. Install a engine lifting device to the engine lift brackets.
  54. Remove the engine.
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