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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 490 (ENGINE MECHANICAL - 2.2L (LN2))REPAIR INSTRUCTIONSON-VEHICLE REPAIR INSTRUCTIONSENGINE REPLACEMENTREMOVAL PROCEDURE
1999 GMC Forward Control 5.7 R, Automatic

Removal Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Removal Procedure
WARNING: This page is about a different car, the 2003 GMC Sonoma and 2003 Chevrolet S10 Pickup. 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 hood. Refer to HOOD REPLACEMENT in Body Front End.
  3. If the vehicle is equipped with a manual transmission, remove the shift tower. Refer to SHIFT TOWER REPLACEMENT in Manual Transmission - NV 1500.
  4. Raise and support the vehicle. Refer to JACKING AND LIFTING in General Information.
  5. Disconnect the exhaust pipe from the exhaust manifold. Refer to EXHAUST MANIFOLD REPLACEMENT in Engine Exhaust.
    Fig 1: Removing Oil Filter Drain Deflector From Brace Rod
    G01977054Courtesy of GENERAL MOTORS CORP.
  6. Remove the oil filter drain deflector from the brace rod, if equipped.
  7. Remove the starter motor. Refer to STARTER MOTOR in Starter.
  8. Remove the transmission.
  9. Disconnect the oxygen sensor electrical connector. Refer to HEATED OXYGEN SENSOR (HO2S) REPLACEMENT in System & Component Testing - 2.2L in Engine Performance.
  10. Remove the right fender wheelhouse extension. Refer to WHEELHOUSE EXTENSION REPLACEMENT in Body Front End.
  11. Working through the wheelhouse opening, remove the generator rear brace using the following procedure:
    1. 11.1. Remove the bolt from the rear of the generator.
    2. 11.2. Remove two nuts holding the brace to the engine.
    3. 11.3. Remove the brace from the engine.
      Fig 2: Removing Bolt From Rear Of Generator
      G01977055Courtesy of GENERAL MOTORS CORP.
  12. Remove the bolt holding the battery negative cable (2) to the engine.
  13. Remove the bolt holding the ground wires (1) to the engine.
  14. Disconnect the following electrical connectors:
    • Engine oil pressure gauge sensor (6)
    • Camshaft position (CMP) sensor (5)
    • Crankshaft position (CKP) sensor (3)
    • Knock (KS) sensor (4)
      Fig 3: Disconnecting Electrical Connectors
      G01977056Courtesy of GENERAL MOTORS CORP.
  15. Disconnect both ignition control module (ICM) electrical connectors (2).
  16. Disconnect the EVAP purge canister solenoid valve electrical connector.
  17. Lower the vehicle.
    Fig 4: Disconnecting Both Ignition Control Module (ICM) Electrical Connectors
    G01977057Courtesy of GENERAL MOTORS CORP.
  18. Remove the bolt holding the EVAP emission canister purge harness and if equipped the automatic transmission fluid fill tube to the intake manifold.
  19. Remove the nut holding the engine wiring harness clip to the intake manifold.
  20. Remove the nut holding the engine wiring harness clip to the intake manifold rear lower stud.
  21. Remove the air intake duct.
  22. Remove the radiator. Refer to RADIATOR REPLACEMENT (2.2L) in Engine Cooling.
  23. Remove the drive belt. Refer to DRIVE BELT REPLACEMENT  .
    Fig 5: Removing Nut Holding Engine Wiring Harness Clip To Intake Manifold
    G01977058Courtesy of GENERAL MOTORS CORP.

    Important:  Do not evacuate the A/C system.

  24. Remove the air conditioning compressor, if equipped, and set it aside. Refer to COMPRESSOR REPLACEMENT (2.2L) in Heating, Ventilation and Air Conditioning.
  25. Remove the power steering pump and set it aside. Refer to POWER STEERING PUMP REPLACEMENT (2.2L) in Power Steering Systems.
  26. Disconnect both heater hoses from the heater core. Refer to HEATER HOSE REPLACEMENT - INLET (2.2L) and HEATER HOSE REPLACEMENT - OUTLET (2.2L) in Heating Ventilation and Air Conditioning.
  27. Disconnect the heating and air conditioning control vacuum source hose.
  28. Disconnect the EVAP emission purge tube from the throttle body.
    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 control cable.
  30. Disconnect the cruise control cable from the throttle shaft. Refer to CRUISE CONTROL CABLE REPLACEMENT (2.2L) in Cruise Control.
    Fig 6: Disconnecting EVAP Emission Purge Tube From Throttle Body
    G01977059Courtesy of GENERAL MOTORS CORP.
  31. Remove the battery positive cable cover from the underhood fuse block.
    Fig 7: Removing Battery Positive Cable Cover From Underhood Fuse Block
    G01977060Courtesy of GENERAL MOTORS CORP.
  32. Remove the battery positive cable bolt.
  33. Remove the battery positive cable.
  34. Disconnect the engine coolant heater, if equipped. Refer to COOLANT HEATER REPLACEMENT (2.2L) in Engine Cooling.
  35. Disconnect the electrical connections from the generator. Refer to GENERATOR in Generators and Regulators.
    Fig 8: Removing Battery Positive Cable Bolt
    G01977061Courtesy of GENERAL MOTORS CORP.
  36. Disconnect the following electrical connectors from the top of the engine:
    • Engine coolant temperature (ECT) sensor (3)
    • Idle air control (IAC) motor (1)
    • Manifold absolute pressure (MAP) sensor (4)
    • Throttle position (TP) sensor (2)
      Fig 9: Disconnecting Electrical Connectors From Top Of Engine
      G01977062Courtesy of GENERAL MOTORS CORP.
  37. Disconnect the fuel injector harness electrical connector.
  38. Remove the fuel injector harness electrical connector from the bracket on the valve rocker arm cover.
  39. Remove the engine wiring harness from the bracket.
  40. Move and secure the engine wiring harness out of the way.
  41. Disconnect the fuel hoses.
    Fig 10: Removing Engine Wiring Harness From Bracket
    G01977063Courtesy of GENERAL MOTORS CORP.
  42. Disconnect the electrical connection from the generator.
  43. Disconnect the generator output wire from the generator.
  44. Move the engine wiring harnesses aside.
    Fig 11: Disconnecting Generator Output Wire From Generator
    G01977064Courtesy of GENERAL MOTORS CORP.
  45. Install a suitable engine lifting device to the engine lift brackets.
  46. Raise the engine to release tension on the engine mount through bolt.
    Fig 12: Raising Engine To Release Tension On Engine Mount Through Bolt
    G01977065Courtesy of GENERAL MOTORS CORP.
  47. Remove the left side engine mount through-bolt.
    Fig 13: Removing Left Side Engine Mount Through-Bolt
    G01977066Courtesy of GENERAL MOTORS CORP.
  48. Remove the right side engine mount through-bolt.
  49. Remove the engine from the vehicle.
    Fig 14: Removing Right Side Engine Mount Through-Bolt
    G01977067Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.