GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 Express 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Spark Plug Replacement

Removal Procedure

    Object Number: 1950007 Size: SH
  1. Remove the engine cover, if required. Refer to Engine Cover Replacement .
  2. If required, remove the appropriate left side spark plug wire boot(s) (2) from the spark plug(s).
    3. 2.1. Twist the spark plug boot 1/2 turn.
    2.2. Pull ONLY on the spark plug boot or use a tool designed for this purpose in order to remove the spark plug wire boot from the spark plug.

    Object Number: 1950008 Size: SH
  3. If required, remove the appropriate right side spark plug wire boot(s) (1) from the spark plug(s).
    4. 3.1. Twist the spark plug boot 1/2 turn.
    3.2. Pull ONLY on the spark plug boot or use a tool designed for this purpose in order to remove the spark plug wire boot from the spark plug.

    Object Number: 1950043 Size: SH
  4. If required, loosen the appropriate left side spark plug 1 or 2 turns.
  5. Brush or air blast away any dirt from around the spark plug.
  6. Remove the appropriate left side spark plug (1) . If removing more than 1 plug, place each plug in a tray marked with the corresponding cylinder number.

    7. Object Number: 1950044 Size: SH
  7. If required, loosen the appropriate right side spark plug 1 or 2 turns.
  8. Brush or air blast away any dirt from around the spark plug.
  9. Remove the appropriate right side spark plug (1). If removing more than 1 plug, place each plug in a tray marked with the corresponding cylinder number.

Installation Procedure

    Object Number: 1950044 Size: SH
  1. Ensure that the spark plug washer is positioned correctly.
  2. Inspect the spark plug gap. Adjust the gap as needed. Refer to Engine Mechanical Specifications .
  3. Install the appropriate right side spark plug (1) into the cylinder head by hand.

    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: 1950043 Size: SH
  5. Install the appropriate left side spark plug (1) into the cylinder head by hand.
  6. Tighten the spark plug.

    7. Tighten
    Tighten the plug to 15 N·m (11 lb ft).


    Object Number: 1950008 Size: SH

    Notice: If the boot to wire movement has occurred, the boot will give a false visual impression of being fully seated. Ensure that the boots have been properly assembled by pushing sideways on the installed boots. Failure to properly seat the terminal onto the spark plug will lead to wire core erosion and result in an engine misfire or crossfire condition, and possible internal damage to the engine.

  7. If reinstalling the old spark plug wires, apply dielectric grease GM PN  12345579 (Canadian PN 10953481), or equivalent to the inside of the spark plug wire boots.
  8. Install the appropriate right side spark plug wire boot(s) (1) to the spark plug(s).

    9. Object Number: 1950007 Size: SH
  9. Install the appropriate left side spark plug wire boot(s) (2) to the spark plug(s).
  10. Install the engine cover, if required. Refer to Engine Cover Replacement .