GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2008 🢒 G8 🢒 Preface 🢒 Cautions and Notices 🢒 Spark Plug Replacement

Removal Procedure
  1. Remove the engine cover. Refer to Engine Cover Replacement .
  2. Remove the spark plug wires. Refer to Spark Plug Wire Replacement .

    3. Object Number: 1950749 Size: SH
  3. Loosen each spark plug 1 or 2 turns.
  4. Use a brush, or use compressed air in order to remove any dirt from the spark plugs.
  5. Remove the spark plugs one at a time and place each plug in a tray marked with the corresponding cylinder numbers.

Installation Procedure

    Object Number: 1950749 Size: SH
  1. Inspect each spark plug gap. Adjust each plug as needed.

    2. Specification
    Spark plug gap: 1.524 mm (0.060 in).

    Notice: Refer to Fastener Notice in the Preface section.

  2. Hand start the spark plugs in the corresponding cylinders.
  3. Tighten the spark plugs.

    4. Tighten

        • Tighten the engine spark plug on a NEW cylinder head to 20 N·m (15 lb ft).
        • Tighten the engine spark plug on subsequent installations to 15 N·m (11 lb ft).
  4. Install the spark plug wires. Refer to Spark Plug Wire Replacement .
  5. Install the engine cover. Refer to Engine Cover Replacement .