GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2008 🢒 Sierra - 2WD 🢒 Preface 🢒 Cautions and Notices 🢒 Spark Plug Replacement

Removal Procedure

    Object Number: 1707125 Size: SH
  1. Remove the spark plug wire from the spark plug.
    2. 1.1. Twist the spark plug wire boot a 1/2 turn.
    1.2. Pull only on the boot in order to remove the wire from the spark plug.

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

    4. 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.