GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Notice: 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.

  1. Remove the ignition coils . Refer to Ignition Coil Replacement .

  2. Object Number: 1339183  Size: SH

    Important: Remove any water and debris from the spark plug holes before spark plug removal with compressed air.

  3. Remove the spark plugs with a spark plug socket.
  4. Inspect the spark plugs. Refer to Spark Plug Inspection .

Installation Procedure

  1. Gap the spark plug, using round wire type spark plug gap gage.
  2. Gap
    Adjust the spark plug gap to 1.0 mm (0.040 in).

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1339183  Size: SH

    Important: DO NOT coat the spark plugs with anti-seize compound. Over torquing could occur and damage to the cylinder head threads may result.

  3. Install the spark plugs with a spark plug socket.
  4. Tighten
    Tighten the spark plugs to 20 N·m (15 lb ft).

  5. Install the ignition coils . Refer to Ignition Coil Replacement .