GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 43301 Coil Pack Remover

Removal Procedure

  1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief .

  2. Object Number: 785815  Size: MH
  3. Refer to Metal Collar Quick Connect Fitting Service in order to disconnect the following quick connect fittings from the fuel rail.
  4. • The return hose/pipe (1)
    • The feed hose/pipe (2)
    • Plug the open outlets to prevent fluid loss and contamination.
  5. Disconnect the evaporative emission (EVAP) quick connect fitting (3). Refer to Plastic Collar Quick Connect Fitting Service .
  6. Open the retainer (4) located at the engine control module (ECM) bracket in order to remove the chassis hose/pipes.

  7. Object Number: 785768  Size: SH
  8. Disconnect the 2 cable harness clips (1) securing the engine wiring harness (4) to the ECM bracket (2).
  9. Remove the 2 bolts (3) securing the afterboil coolant pump to the ECM bracket, and position aside.
  10. Notice: Always turn the ignition off when installing or removing the ECM connectors in order to prevent damage to the components.

    Important: Ensure the ignition is in the OFF position.


    Object Number: 785849  Size: SH
  11. Remove the screw (2) securing the engine control module (ECM) ground wire (1) to the ECM (3).

  12. Object Number: 785823  Size: SH

    Notice: In order to prevent any possible electrostatic discharge damage to the ECM, do not touch the connector pins.

  13. Flip the release levers to the open position (3) and disconnect the ECM connectors (2) from the ECM (5).
  14. Remove the bolt securing the coolant inlet pipe to the ECM bracket.

  15. Object Number: 785761  Size: SH
  16. Remove the ECM bracket bolts from the following:
  17. • The intake plenum
    • The cylinder head
  18. Remove the ECM bracket from the engine with the ECM still attached, and position aside.

  19. Object Number: 785857  Size: SH
  20. Disconnect the electrical connector (2) from the right knock sensor pigtail (1).

  21. Object Number: 785822  Size: SH
  22. Disconnect the electrical connector (2) from the coil pack (1).
  23. Remove the coil pack retainer bolts.

  24. Object Number: 411471  Size: SH

    Important: DO NOT overtighten the J 43301 .

  25. Thread the J 43301 into the coil pack.
  26. With even pressure, lift and remove the coil pack from the cam cover.

Installation Procedure

  1. Inspect the coil pack seals and spark plug boots for damage or wear.
  2. Replace as necessary.


    Object Number: 444014  Size: SH
  3. Align the spark plug boots with the spark plugs.
  4. Carefully press and seat the coil pack in place.
  5. Notice: Refer to Fastener Notice in the Preface section.

  6. Install the coil pack retainer bolts.
  7. Tighten
    Tighten the coil pack retainer bolts to 8 N·m (71 lb in).


    Object Number: 785822  Size: SH
  8. Connect the electrical connector (2) to the coil pack (1).

  9. Object Number: 785857  Size: SH
  10. Connect the electrical connector (2) to the right knock sensor pigtail (1).

  11. Object Number: 785761  Size: SH
  12. Position the ECM and bracket to the engine.
  13. Install the ECM bracket bolts to the following:
  14. • The cylinder head
    • The intake plenum
  15. Tighten the ECM bracket bolts in the sequence shown.
  16. Tighten

        • Tighten the ECM bracket to cylinder head bolt to 20 N·m (15 lb ft).
        • Tighten the ECM bracket to intake plenum bolts to 8 N·m (71 lb in).
  17. Install the bolt securing the coolant inlet pipe to the ECM bracket.
  18. Tighten
    Tighten the coolant inlet pipe support bolt to 20 N·m (15 lb ft).


    Object Number: 785823  Size: SH
  19. Carefully align the harness connectors (2) with the ECM connectors.
  20. Guide the connectors (2) into place while moving the release levers to the locked position (1).

  21. Object Number: 785849  Size: SH
  22. Install the screw (2) securing the ECM ground wire (1) to the ECM (3).
  23. Tighten
    Tighten the ECM ground wire screw to 4.5 N·m (40 lb in).


    Object Number: 785768  Size: SH
  24. Install the 2 bolts (3) securing the afterboil coolant pump to the ECM bracket.
  25. Tighten
    Tighten the afterboil coolant pump bolts to 10 N·m (89 lb in).

  26. Connect the 2 cable harness clips (1) securing the engine wiring harness (4) to the ECM bracket (2).

  27. Object Number: 785815  Size: MH
  28. Insert the chassis hose/pipes into the retainer (4) located at the ECM bracket.
  29. Close the retainer (4).
  30. Connect the EVAP quick connect fitting (3). Refer to Plastic Collar Quick Connect Fitting Service .
  31. Refer to Metal Collar Quick Connect Fitting Service in order to connect the following quick connect fittings to the fuel rail.
  32. • The feed hose/pipe (2)
    • The return hose/pipe (1)