GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 Century (China) (CNG) 🢒 Engine 🢒 Engine Electrical 🢒 Spark Plug Wire Harness Replacement

Removal Procedure
  1. Turn the ignition switch to the OFF position.

    2. Object Number: 473411 Size: SH
  2. Note the position of the spark plug wire retaining clips. Remove the spark plug wire retaining clips from the engine.

    3. Object Number: 473409 Size: SH

    Notice: Twist the spark plug boot one-half turn in order to release the boot. Pull on the spark plug boot only. Do not pull on the spark plug wire or the wire could be damaged.

  3. Note the position of the spark plug wire(s). Remove the spark plug wires (2,4,6) from the front spark plugs by twisting the boot 1/2 turn before removing the spark plug boot(s).

    4. Object Number: 194150 Size: SH
  4. Note the position of the spark plug wire(s). Remove the spark plug wires (1,3,5) from the rear spark plugs by twisting the boot 1/2 turn before removing the spark plug boot(s).
  5. Remove the spark plug wire retaining clips from the rear of the engine.

    6. Object Number: 162818 Size: SH
  6. Remove the spark plug wires from the ignition coils.
  7. Remove the spark plug wires from the engine.
  8. If replacing the spark plug wires, transfer any of the following:
    9. • Boot heat shields
    • Spark plug wire conduit
    • Spark plug wire retaining clips

Installation Procedure
  1. Position the spark plug wire(s) to the engine.

    2. Object Number: 162818 Size: SH
  2. Install the spark plug wires to the ignition coils in the proper position.

    3. Object Number: 194150 Size: SH
  3. Install the spark plug wires (1,3,5) to the rear spark plugs.
  4. Install the spark plug wire retaining clips from the rear of the engine.

    5. Object Number: 473409 Size: SH
  5. Install the spark plug wire (2,4,6) to the front spark plugs.

    6. Object Number: 473411 Size: SH
  6. Install the spark plug wire retaining clips to the front of the engine.