GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 343699  Size: SH
  1. Disconnect the spark plug wire at each spark plug.
  2. • Twist each spark plug wire 1/2 turn.
    • Pull only on the boot in order to remove the wire from each spark plug.
  3. Disconnect the spark plug wire from the ignition coil.
  4. • Twist each spark plug boot 1/2 turn.
    • Pull only on the boot in order to remove the wires from the ignition coil.

Spark Plug Wire Length V8

   • 
Object Number: 340933  Size: SH
  • The Melco® (square design) uses a spark plug wire (1) that is 145 mm (5.70 in) length cable seal to cable seal.
  •    • 
  • The Delphi® (round design) uses a spark plug wire (2) that is 110 mm (4.30 in) length cable seal to cable seal.
  •    • 
    Object Number: 260177  Size: SH
  • There are 2 different manufacturers for the ignition coils. the Melco® (1) (square design), and the Delphi® (2) (round design). These 2 coils use 2 different spark plug wire, and mounting brackets.
  •    • 
    Object Number: 260077  Size: SH
  • Melco® (square design) coil mounting bracket (1).
  •    • 
  • Delphi® (round design) coil mounting bracket (2).
  • Installation Procedure


      Object Number: 343699  Size: SH
    1. Install the spark plug wires at the ignition coil.
    2. Install the spark plug wire to each spark plug.
    3. Inspect the wires for proper installation:
    4. • Push sideways on each boot in order to inspect the seating.
      • Reinstall any loose boot.