GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2008 🢒 Escalade EXT 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Spark Plug Replacement

Removal Procedure

    Object Number: 1707125 Size: SH
  1. If replacing the right side spark plug(s), remove the right front wheelhouse liner. Refer to Front Wheelhouse Liner Replacement - Right Side , and remove the right side plug(s) through the wheel opening.

    2. Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

    The High Voltage Disabling procedure will perform the following tasks:

       • Identify how to disable high voltage.
       • Identify how to test for the presence of high voltage.
       • Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.
    Failure to follow the procedures exactly as written may result in serious injury or death.

  2. If replacing the right side spark plug(s), perform the service disconnect. Refer to High Voltage Disabling .
  3. Remove the spark plug wire from the spark plug.
    4. 3.1. Twist the spark plug wire boot a 1/2 turn.
    3.2. Pull only on the boot in order to remove the wire from the spark plug.

    Object Number: 14824 Size: SH
  4. Brush or using compressed air, blow away any dirt from around the spark plug.
  5. Remove the spark plug.

    6. If removing more than one plug, place each plug in a tray marked with the corresponding cylinder number.

Installation Procedure

    Object Number: 14824 Size: SH
  1. Correctly position the spark plug washer.
  2. Inspect the spark plug gap. Adjust the gap as needed. Refer to Ignition System Specifications
  3. Hand start the spark plug in the corresponding cylinder.

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

  4. Tighten the spark plug.

    5. Tighten
    Tighten the plug to 15 N·m (11 lb ft).


    Object Number: 1707125 Size: SH
  5. Install the spark plug wire to the spark plug.
  6. Inspect the spark plug wire for proper installation:
    7. 6.1. Push sideways on each boot in order to inspect the seating.
    6.2. Reinstall any loose boot.
  7. If a right side spark plug(s) was replaced, install the right front wheelhouse liner. Refer to Front Wheelhouse Liner Replacement - Right Side .
  8. If a right side spark plug(s) was replaced, perform the service reconnect. Refer to High Voltage Enabling .