GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Caution: This engine has aluminum cylinder heads. Do not remove the spark plugs from a hot engine, allow it to cool first. Removing the spark plugs from a hot engine may cause spark plug thread damage or cylinder head damage.


    Object Number: 1578474  Size: SH
  1. Remove the ignition coil(s). Refer to Ignition Coil Replacement.
  2. Note: Make sure that any water and/or debris is blown out of the spark plug holes prior to removing the spark plugs.

  3. Remove the spark plugs using a 5/8 inch spark plug socket.

Installation Procedure

    Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1578474  Size: SH

    Caution: Do not coat spark plug threads with anti-seize compound. If anti-seize compound is used and spark plugs are over-torqued, damage to the cylinder head threads may result.

  1. Install the spark plugs.
  2. Specification
    The spark plug gap is 1.0 mm (0.040 in).

    Tighten
    Tighten the plugs to 20 N·m (15 lb ft).

  3. Install the ignition coil(s). Refer to Ignition Coil Replacement.