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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1497 (Engine Mechanical - 4.2L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Engine Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the hood. Refer to HOOD REPLACEMENT  in Body Front End.
  2. Disconnect the negative battery cable. Refer to BATTERY NEGATIVE CABLE DISCONNECT/CONNECT PROCEDURE  in Engine Electrical.
  3. Drain engine coolant. Refer to DRAINING AND FILLING COOLING SYSTEM (BODY VIN CODE 6)  or DRAINING AND FILLING COOLING SYSTEM (BODY VIN CODE 3)  in Engine Cooling.
  4. Recover the refrigerant. Refer to REFRIGERANT RECOVERY AND RECHARGING  in Heating, Ventilation and Air Conditioning.
    Fig 1: Removing Oil Pan Drain Plug
    G02128613Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Keep drain plug removed during engine removal and installation.
  5. Remove the oil pan drain plug and drain the oil.
  6. Install a suitable plug into the oil pan after draining to prevent any oil leakage during the rest of the procedure.
  7. Remove the air cleaner assembly. Refer to AIR CLEANER ASSEMBLY .
  8. Remove the throttle body. Refer to THROTTLE BODY .
  9. Remove the map sensor. Refer to MANIFOLD ABSOLUTE PRESSURE SENSOR .
  10. Remove the washer solvent container. Refer to WASHER SOLVENT CONTAINER REPLACEMENT in Wipers/Washer Systems.
  11. Remove the air intake baffle. Refer to AIR INTAKE BAFFLE REPLACEMENT - RADIATOR  in Body Front End.
  12. Remove the grill. Refer to GRILLE REPLACEMENT (GMC)  or GRILLE REPLACEMENT (OLDSMOBILE)  or GRILLE REPLACEMENT (CHEVROLET)  in Body Exterior.
  13. Remove the headlamp housing. Refer to LIGHTING SYSTEMS  or LIGHTING SYSTEMS  in Body Front End.
  14. Remove the radiator support brace. Refer to BRACE REPLACEMENT - RADIATOR SUPPORT DIAGONAL  in Body Front End.
  15. Remove the hood latch. Refer to HOOD LATCH SUPPORT REPLACEMENT  in Body Front End.
  16. Disconnect A/C lines at the condenser.
  17. Disconnect the transmission cooler lines at the engine, not the radiator.
  18. Remove the cooling fan and the shroud tilting the radiator forward, and the cooling fan and the shroud rearward for clearance. Refer to COOLING FAN AND SHROUD REPLACEMENT  in Engine Cooling.
  19. Remove the radiator with condenser and transmission cooler lines. Refer to RADIATOR REPLACEMENT (BODY VIN CODE 6)  or RADIATOR REPLACEMENT (BODY VIN TYPE 3)  in Engine Cooling.
  20. Remove the drive belt. Refer to DRIVE BELT REPLACEMENT   .
  21. Remove the power steering pump bolts and lay the pump aside.
  22. Ensure the heater hoses at the heater core are disconnected.
    Fig 2: Disconnecting Heater Hoses At Heater Core
    G02128614Courtesy of GENERAL MOTORS CORP.
  23. Disconnect the transmission filler tube bracket nut from the AIR adapter.
    Fig 3: Disconnecting Transmission Filler Tube Bracket Nut From AIR Adapter
    G02128615Courtesy of GENERAL MOTORS CORP.
  24. Remove the AIR adapter.
    Fig 4: Removing AIR Adapter
    G02128616Courtesy of GENERAL MOTORS CORP.
  25. Install the lift hook J 44220  to the AIR adapter.
  26. Disconnect the oxygen sensor electrical connector.
  27. Disconnect the A/C line at the accumulator.
  28. Disconnect the front axle actuator electrical connector.
  29. Disconnect the camshaft phaser actuator valve electrical connector.
    Fig 5: Installing Lift Hook To AIR Adapter
    G02128617Courtesy of GENERAL MOTORS CORP.
  30. Unclip the transmission cooler lines from right side of the engine block.
  31. Disconnect the ignition coil harness connectors.
    Fig 6: Unclipping Transmission Cooler Lines From Right Side Of Engine Block
    G02128618Courtesy of GENERAL MOTORS CORP.
  32. Carefully disconnect harness retainer at clips (1) and remove.
  33. Remove power brake hose at booster.
    Fig 7: Disconnecting Harness Retainer At Clips
    G02128619Courtesy of GENERAL MOTORS CORP.
  34. Remove the PCM. Refer to POWERTRAIN CONTROL MODULE .
  35. Disconnect the fuel lines at the fuel pressure regulator and cap lines. Refer to FUEL PRESSURE REGULATOR .
  36. Remove all harnesses from the engine harness bracket.
  37. Disconnect the front differential vent hose from the engine harness bracket.
    Fig 8: Removing All Harnesses From Engine Harness Bracket
    G02128620Courtesy of GENERAL MOTORS CORP.
  38. Remove the engine harness bracket bolt and remove bracket.
    Fig 9: Removing Engine Harness Bracket Bolt And Removing Bracket
    G02128621Courtesy of GENERAL MOTORS CORP.
  39. Disconnect starter electrical connections (1).
  40. Disconnect the A/C pressure sensor and clutch electrical connector.
    Fig 10: Disconnecting Starter Electrical Connections
    G02128622Courtesy of GENERAL MOTORS CORP.
  41. Disconnect generator electrical connector and battery lead.
  42. Disconnect the knock sensor electrical connector.
  43. Disconnect the crankshaft sensor electrical connector.
  44. Disconnect the camshaft sensor electrical connector.
    Fig 11: Disconnecting Generator Electrical Connector And Battery Lead
    G02128623Courtesy of GENERAL MOTORS CORP.
  45. Remove 4 grounds on the left side of the block (1).
  46. Raise the vehicle. Refer to LIFTING AND JACKING THE VEHICLE in General Information.
  47. Remove the wheel drive shafts, left and right. Refer to AXLE SHAFTS .
  48. Remove the propeller shaft from the front axle pinion yoke. Refer to PROPELLER SHAFT REPLACEMENT - FRONT  in Propeller Shaft.
  49. Remove the engine protection shield. Refer to ENGINE PROTECTION SHIELD REPLACEMENT
    Fig 12: Removing Grounds On Left Side Of Block
    G02128624Courtesy of GENERAL MOTORS CORP.
  50. Disconnect the exhaust pipe from the exhaust manifold and slide the exhaust pipe backward slightly.
  51. Remove the fuel tank shield, if equipped.
  52. Remove the torque converter bolt access cover.
  53. Remove the torque converter bolts.
  54. Place a jack on the transmission oil pan for support.
  55. Remove the transmission support. Refer to TRANSMISSION SUPPORT .
  56. Lower the transmission enough to reach the top bell housing bolts.
    Fig 13: Disconnecting Exhaust Pipe From Exhaust Manifold
    G02128625Courtesy of GENERAL MOTORS CORP.
  57. Remove the top 4 bell housing bolts, there may be 2 harness clips that will need to be removed in order to have access to 2 of the top bolts.
  58. Raise the transmission.
  59. Reinstall the transmission support using only 2 through bolts.
  60. Remove the remaining bell housing bolts, for a total of 11 bolts.
  61. Remove the left and right engine lower mount nuts.
  62. Disconnect the oil lever sensor electrical connector.
  63. Disconnect the oil pressure switch electrical connector.
  64. Lower the vehicle.
  65. Remove the left upper engine mount nut.
    Fig 14: Removing Left Upper Engine Mount Nut
    G02128626Courtesy of GENERAL MOTORS CORP.
  66. Remove the right upper engine mount nut.
  67. Install the engine hoist.
  68. Raise the engine out of the compartment slowly keeping the transmission supported.
  69. Remove both engine mount for clearance.
  70. Continue raising the engine out of the vehicle.
  71. Install the engine to the engine stand.
    Fig 15: Removing Right Upper Engine Mount Nut
    G02128627Courtesy of GENERAL MOTORS CORP.
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