GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2005 🢒 CTS 🢒 Engine 🢒 Engine Mechanical - 5.7L 🢒 Ignition Coil Replacement

Removal Procedure

    Object Number: 772418 Size: SH

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  1. Disconnect the negative battery cable (2). Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  2. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical - 5.7L.

    3. Object Number: 309721 Size: SH

    Important: The ignition coils can be removed individually or as an assembly, depending on the repair being performed.

  3. If replacing an individual coil, disconnect the wire harness at the coil. If removing the coil assembly, disconnect the main coil harness connector.
  4. Disconnect the spark plug wire at the ignition coils.
  5. If replacing an individual coil, remove the ignition coil mounting bolts and/or nut that retains the coil to the coil bracket.
  6. If removing the coil assembly, remove the bolts securing the coil bracket to the valve rocker arm cover.
  7. Remove the ignition coil or coil assembly.

Installation Procedure

    Object Number: 309721 Size: SH
  1. Install the ignition coil or coil assembly.

    2. Notice: Refer to Fastener Notice in the Preface section.

  2. Install the ignition coil bolts and/or nuts.

    3. Tighten

    • Tighten the ignition coil-to-bracket bolts/nuts to 12 N·m (106 lb in).
    • Tighten the ignition coil bracket-to-valve rocker cover bolts to 12 N·m (106 lb in).
  3. Connect the spark plug wires at the ignition coils.
  4. Connect the individual ignition coil or main coil harness connector.

    5. Object Number: 772418 Size: SH
  5. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical - 5.7L.
  6. Connect the negative battery cable (2). Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.