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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1618 (Engine Mechanical - 4.3L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Engine Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2003 GMC Sierra and 2003 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Raise the hood to the service position, perform the following:
    1. 1.1. Remove the hood hinge bolts (1).
    2. 1.2. Raise the hood until vertical.
    3. 1.3. Install the hood hinge bolts until snug in the service position (2).
  2. Disconnect the negative battery cable. Refer to BATTERY NEGATIVE CABLE DISCONNECT/CONNECT PROCEDURE (SINGLE BATTERY) .
  3. Drain the cooling system. Refer to DRAINING AND FILLING COOLING SYSTEM .
    Fig 1: Hood Hinge Bolts & Hood
    G02106047Courtesy of GENERAL MOTORS CORP.
  4. Remove the fuel pipes/hoses. Refer to FUEL HOSES & PIPES .
  5. Remove the lower fan shroud. Refer to FAN SHROUD REPLACEMENT-LOWER .
  6. Remove the drive belt. Refer to Drive Belt Replacement .
  7. Raise and suitably support the vehicle. Refer to JACKING AND LIFTING .
  8. If equipped, remove the oil pan skid plate bolts and plate.
  9. If equipped, remove the engine shield. ENGINE PROTECTION SHIELD REPLACEMENT
  10. Remove the starter. Refer to STARTER MOTOR .
    Fig 2: Oil Pan Skid Plate & Bolt
    G02106048Courtesy of GENERAL MOTORS CORP.
  11. Remove the transmission cover.
    Fig 3: Transmission Cover
    G02106049Courtesy of GENERAL MOTORS CORP.
  12. Remove the positive battery cable clip bolt (2).
  13. Remove the catalytic converter. Refer to CATALYTIC CONVERTER REPLACEMENT (4.3L, 4.8L AND 5.3L ENGINES) .
    Fig 4: Positive Battery Cable Clip Bolt
    G02106050Courtesy of GENERAL MOTORS CORP.
  14. Remove the battery cable bracket bolts.
    Fig 5: Battery Cable Bracket Bolts
    G02106051Courtesy of GENERAL MOTORS CORP.
  15. Disconnect the oil level sensor electrical connector (7).
  16. Disconnect the crankshaft position (CKP) sensor electrical connector (5) and remove the harness from the retainer clip.
  17. Remove the ground bolt (3) holding the negative battery cable (6) and ground cable (4) to the engine.
    Fig 6: Electrical Connectors, Ground Bolt, Cable & Negative Battery Cable
    G02106052Courtesy of GENERAL MOTORS CORP.
  18. If equipped, remove the torque converter bolts.
  19. Remove the transmission bolts.
  20. Lower the vehicle.
    Fig 7: Torque Converter Bolts
    G02106053Courtesy of GENERAL MOTORS CORP.
  21. Reposition the radiator inlet hose clamp.
  22. Remove the radiator inlet hose from the thermostat housing.
    Fig 8: Radiator Inlet Hose & Clamp
    G02106054Courtesy of GENERAL MOTORS CORP.
  23. Reposition the radiator outlet hose clamps.
  24. Remove the radiator outlet hose from the surge tank.
  25. Remove the radiator outlet hose from the water pump.
    Fig 9: Radiator Outlet Hoses & Clamps
    G02106055Courtesy of GENERAL MOTORS CORP.
  26. If equipped, disconnect the cruise control cable from the throttle lever.
  27. If equipped, remove the cruise control cable from the accelerator control cable bracket.
    Fig 10: Cruise Control Cable & Accelerator Control Cable Bracket
    G02106056Courtesy of GENERAL MOTORS CORP.
  28. Remove the accelerator cable from the throttle body lever.
    Fig 11: Accelerator Cable & Throttle Body Lever
    G02106057Courtesy 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.
  29. Remove the accelerator cable from the accelerator control cable bracket.
    Fig 12: Accelerator Cable & Bracket
    G02106058Courtesy of GENERAL MOTORS CORP.
  30. Remove the accelerator cable from the throttle body lever.
    Fig 13: Accelerator Cable & Throttle Body Lever
    G02106059Courtesy of GENERAL MOTORS CORP.
  31. Remove the accelerator control cable bracket nuts.
  32. Remove the accelerator control cable bracket with the cables attached, from the throttle body.
  33. Reposition and secure the bracket and cable out of the way.
  34. If equipped, remove the air conditioning (A/C) hoses.
    Fig 14: Accelerator Control Cable, Bracket & Nuts
    G02106060Courtesy of GENERAL MOTORS CORP.
  35. Disconnect the following electrical connectors:
    • A/C pressure switch (4), if equipped
    • A/C compressor clutch (1), if equipped
  36. Remove the positive cable nut and cable from the generator.
    Fig 15: A/C Pressure Switch & A/C Compressor Clutch Electric Connectors
    G02106061Courtesy of GENERAL MOTORS CORP.
  37. Disconnect the following electrical connectors:
    • Throttle position (TP) sensor (1)
    • Idle air control (IAC) motor (2)
    • Control port injector module (3)
    • Engine coolant temperature (ECT) sensor (5)
  38. Remove the engine wiring harness clip bolt (4).
    Fig 16: Electric Connectors, Control Port Injector Module & Wiring Harness Clip Bolt
    G02106062Courtesy of GENERAL MOTORS CORP.
  39. Disconnect the following electrical connectors:
    • Evaporative emission (EVAP) canister purge solenoid valve (1)
    • Manifold absolute pressure (MAP) sensor (2)
    Fig 17: EVAP Canister Purge Solenoid Valve & MAP Sensor
    G02106063Courtesy of GENERAL MOTORS CORP.
  40. Disconnect the following electrical connectors:
    • Ignition coil (1)
    • Ignition coil driver (2)
    • Generator (3)
  41. Remove the engine wiring harness ground nut and ground wire (4) from the rear of the right cylinder head.
    Fig 18: Ignition Coil, Ignition Coil Driver & Generator Electrical Connectors
    G02106064Courtesy of GENERAL MOTORS CORP.
  42. Disconnect the following electrical connectors:
    • Knock sensor (1)
    • Camshaft position (CMP) sensor (2)
    • Fuel pump/oil pressure sensor (3)
    • Distributor (2)
  43. Remove the harness ground bolt.
  44. Reposition the harness ground (4) and ground strap (5).
    Fig 19: Electric Connectors, Harness Ground & Ground Strap
    G02106065Courtesy of GENERAL MOTORS CORP.
  45. Remove the engine wiring harness bracket nuts.
  46. Remove the engine wiring harness bracket from the studs.
    Fig 20: Engine Wiring Harness Bracket Nuts & Studs
    G02106066Courtesy of GENERAL MOTORS CORP.
  47. Remove the junction block bracket bolt.
  48. Reposition the bracket and wiring harness aside.
    Fig 21: Junction Block Bracket Bolt & Wiring Harness
    G02106067Courtesy of GENERAL MOTORS CORP.
  49. Remove the engine wiring harness rear bracket nut at the EVAP canister purge solenoid valve.
  50. Remove the stud holding the engine wiring harness bracket.
  51. Reposition the engine wiring harness with the bracket aside.
  52. Remove the heater hoses. Refer to HEATER HOSE REPLACEMENT-INLET (LU3)  or HEATER HOSE REPLACEMENT-OUTLET (LU3)  .
  53. Remove the distributor cap. Refer to DISTRIBUTOR .
    Fig 22: Engine Wiring Harness Rear Bracket Nut
    G02106068Courtesy of GENERAL MOTORS CORP.
  54. Disconnect the EVAP canister harness from the purge solenoid valve.
    Fig 23: EVAP Canister Harness & Purge Solenoid Valve
    G02106069Courtesy of GENERAL MOTORS CORP.
  55. Disconnect the power brake booster vacuum hose from the vacuum fitting.
    Fig 24: Power Brake Booster Vacuum Hose & Vacuum Fitting
    G02106070Courtesy of GENERAL MOTORS CORP.
  56. Loosen the power steering (P/S) pump rear bracket nut.
  57. Remove the P/S pump rear bracket front nut.
  58. Remove the bolts and the nut for the P/S pump bracket.
  59. Leave the A/C compressor, if equipped, and the P/S pump on the bracket.
  60. Slide the P/S pump bracket forward off the stud and set aside.
  61. Remove the thermostat and water outlet. Refer to THERMOSTAT REPLACEMENT (4.3L ENGINE) .
    Fig 25: Power Steering Pump Bracket, Bolts & Nut
    G02106071Courtesy of GENERAL MOTORS CORP.
  62. Remove the left front and right rear intake manifold lower bolts.
  63. Install J 41427  to the left front and right rear intake manifold bolts, using the following procedure:
    1. 63.1. Install the J 41427  marked RIGHT REAR.
      NOTE: Refer to FASTENER NOTICE .
    2. 63.2. Install the lift bracket bolts.

      Tighten 

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

    3. 63.3. Install the J 41427  marked LEFT FRONT with the arrow pointing to the front of the engine.
    4. 63.4. Install the lift bracket bolts.

      Tighten 

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

  64. Install a suitable lifting devise to the engine lift brackets.
    Fig 26: J 41427 (Engine Lift Brackets)
    G02106072Courtesy of GENERAL MOTORS CORP.
  65. Remove the engine mount to engine mount bracket nuts.
  66. Support the transmission with a suitable floor jack.
  67. Remove the engine.
    Fig 27: Engine Mount To Engine Mount Bracket Nuts
    G02106073Courtesy of GENERAL MOTORS CORP.
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