GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2003 🢒 Yukon - 4WD 🢒 Preface 🢒 Cautions and Notices 🢒 Spark Plug Replacement

Removal Procedure

    Object Number: 14824 Size: SH
  1. Remove the spark plug wire. Refer to Spark Plug Wire Replacement.
  2. Loosen the spark plug 1 or 2 turns.
  3. Brush or using compressed air, blow away any dirt from around the spark plug.
  4. Remove the spark plug.

    5. 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) for used heads.
        • Tighten the plug to 20 N·m (15 lb ft) for NEW heads.
  5. Install the spark plug wire. Refer to Spark Plug Wire Replacement.