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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1443 (Engine Mechanical - 4.2L (Ll8)) >> Repair Instructions >> On-Vehicle Repair Instructions >> Engine Replacement >> Removal Procedure

Removal Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 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 (LL8) in Engine Cooling.
  4. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging in Heating, Ventilation and Air Conditioning.
    5. Fig 1: View Of Oil Pan Drain Plug
    GM637677Courtesy 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 Replacement in Engine Controls - 4.2L.
  8. Remove the throttle body. Refer to Throttle Body Assembly Replacement in Engine Controls - 4.2L
  9. Remove the manifold absolute pressure (MAP) sensor. Refer to Manifold Absolute Pressure (MAP) Sensor Replacement in Engine Controls - 4.2L
  10. Remove the washer solvent container. Refer to Washer Solvent Container Replacement (Envoy, TrailBlazer) or Washer Solvent Container Replacement (Rainier) in Wipers/Washer Systems.
  11. Remove the grill. Refer to Grille Replacement (Envoy, Envoy XUV) or Grille Replacement (TrailBlazer) or Grille Replacement (Bravada) or Grille Replacement (Rainier) in Exterior Trim.
  12. Remove the headlamp housing. Refer to Headlamp Housing Panel Replacement (TrailBlazer) or Headlamp Housing Panel Replacement (Bravada, Envoy, Envoy XUV, Rainier) in Body Front End.
  13. Remove the radiator support brace. Refer to Brace Replacement - Radiator Support Diagonal in Body Front End.
  14. Remove the hood latch. Refer to Hood Latch Support Replacement in Body Front End.
  15. Disconnect A/C lines at the condenser.
  16. Disconnect the transmission cooler lines at the engine, not the radiator.
  17. 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.
  18. Remove the radiator with condenser and transmission cooler lines. Refer to Radiator Replacement (LL8) in Engine Cooling.
  19. Remove the drive belt. Refer to Drive Belt Replacement  .
  20. Remove the power steering pump bolts and lay the pump aside.
    21. Fig 2: Locating Heater Hoses At Heater Core
    GM771722Courtesy of GENERAL MOTORS CORP.
  21. Ensure the heater hoses at the heater core are disconnected.
  22. Remove the secondary air injection (AIR) reaction solenoid valve. Refer to Secondary Air Injection (AIR) Solenoid Valve Replacement in Engine Controls - 4.2L.
    23. Fig 3: Installing/Removing Lift Hook
    GM750188Courtesy of GENERAL MOTORS CORP.
  23. Install the lift hook J 44220  to the AIR port on the engine head. See Special Tools and Equipment .
  24. Disconnect the oxygen sensor electrical connector.
  25. Disconnect the A/C line at the accumulator.
  26. Disconnect the front axle actuator electrical connector.
  27. Disconnect the camshaft phaser actuator valve electrical connector.
    28. Fig 4: Unclipping/Clipping Transmission Cooler Lines At Engine Block
    GM754348Courtesy of GENERAL MOTORS CORP.
  28. Unclip the transmission cooler lines from right side of the engine block.
  29. Disconnect the ignition coil harness connectors.
    30. Fig 5: View Of Engine Electrical Harness Housing
    GM750195Courtesy of GENERAL MOTORS CORP.
  30. Carefully disconnect harness retainer at clips (1) and remove.
  31. Remove power brake hose at booster.
    32. Fig 6: Removing PCM
    GM761548Courtesy of GENERAL MOTORS CORP.
  32. Remove the PCM. Refer to Powertrain Control Module (PCM) Replacement in Engine Controls - 4.2L.
  33. Disconnect the fuel lines at the fuel pressure regulator and cap lines. Refer to Fuel Pressure Regulator Replacement in Engine Controls - 4.2L.
  34. Remove all harnesses from the engine harness bracket.
  35. Disconnect the front differential vent hose from the engine harness bracket.
    36. Fig 7: View Of Engine Harness Bracket & Bolts
    GM761550Courtesy of GENERAL MOTORS CORP.
  36. Remove the engine harness bracket bolt and remove bracket.
    37. Fig 8: View Of Starter & Related Components
    GM754358Courtesy of GENERAL MOTORS CORP.
  37. Disconnect starter electrical connections (1).
  38. Disconnect the A/C pressure sensor and clutch electrical connector.
    39. Fig 9: Rear Of Generator (Alternator) View
    GM754357Courtesy of GENERAL MOTORS CORP.
  39. Disconnect generator electrical connector and battery lead (1).
  40. Disconnect the knock sensor electrical connector.
  41. Disconnect the crankshaft sensor electrical connector.
  42. Disconnect the camshaft sensor electrical connector.
    43. Fig 10: View Of Left Side Of Block
    GM756989Courtesy of GENERAL MOTORS CORP.
  43. Remove 4 grounds on the left side of the block (1).
  44. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  45. Remove the wheel drive shafts, left and right. Refer to Wheel Drive Shaft Replacement in Wheel Drive Shafts.
  46. Remove the propeller shaft from the front axle pinion yoke. Refer to Propeller Shaft Replacement - Front in Propeller Shaft.
  47. Remove the engine protection shield. Refer to Engine Protection Shield Replacement in Body Front End.
    48. Fig 11: Disconnecting/Connecting Exhaust Pipe
    GM750208Courtesy of GENERAL MOTORS CORP.
  48. Disconnect the exhaust pipe from the exhaust manifold and slide the exhaust pipe backward slightly.
  49. Remove the fuel tank shield, if equipped. Refer to Fuel Tank Shield Replacement (TrailBlazer, Envoy) or Fuel Tank Shield Replacement (TrailBlazer EXT, Envoy XL) in Frame and Underbody.
    50. Fig 12: Disconnecting/Connecting Secondary AIR Pipes
    GM1297763Courtesy of GENERAL MOTORS CORP.
  50. Disconnect the secondary AIR pipes from the secondary AIR pump.
  51. Remove the torque converter bolt access cover.
  52. Remove the torque converter bolts.
  53. Place a jack on the transmission oil pan for support.
  54. Remove the transmission support. Refer to Transmission Support Replacement in Frame and Underbody.
  55. Lower the transmission enough to reach the top bell housing bolts.
    56. Fig 13: View Of Bell Housing Bolts
    GM727330Courtesy of GENERAL MOTORS CORP.
  56. 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.
  57. Raise the transmission.
  58. Reinstall the transmission support using only 2 through bolts.
  59. Remove the remaining bell housing bolts, for a total of 11 bolts.
  60. Remove the left and right engine lower mount nuts.
  61. Disconnect the oil pressure switch electrical connector.
  62. Lower the vehicle.
    63. Fig 14: View Of Left Engine Mount
    GM754319Courtesy of GENERAL MOTORS CORP.
  63. Remove the left upper engine mount nut (1).
    64. Fig 15: View Of Upper Engine Mount Nuts
    GM754322Courtesy of GENERAL MOTORS CORP.
  64. Remove the right upper engine mount nut (1).
  65. Install the engine hoist.
  66. Raise the engine out of the compartment slowly keeping the transmission supported.
  67. Remove both engine mounts for clearance.
  68. Remove the fasteners securing the AIR pipes to the back of the engine head.
  69. Remove the AIR pipes from the vehicle.
  70. Continue raising the engine out of the vehicle.
  71. Install the engine to the engine stand.
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