GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 1999 🢒 Grand Prix 🢒 Engine 🢒 Engine Controls - 3.1L 🢒 Spark Plug Wire Harness Replacement

Spark Plug Wire Harness Replacement 3100

Removal Procedure

Tools Required

J 38491 Spark Plug Heat Shield Removal Tool


    Object Number: 47607 Size: SH
  1. Turn OFF the ignition switch.
  2. Remove the spark plug wire retaining clips from the engine.

    3. 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.

    Important: Transfer any of the following when replacing the spark plug wires:

       • Spark plug wire conduit
       • Spark plug wire retaining clips

  3. Disconnect the spark plug wires from the spark plugs using the J 38491 . Be sure to note the position of the spark plug wires BEFORE removing the spark plug wires.

Installation Procedure

    Object Number: 200500 Size: SH
  1. Connect the spark plug wires (2,4,6) to the left side of the engine.

    2. Object Number: 194150 Size: SH
  2. Connect the spark plug wires (1,3,5) to the right side of the engine.

    3. Object Number: 194134 Size: SH
  3. Install the spark plug wire retaining clips to the engine.

Spark Plug Wire Harness Replacement 3800

Removal Procedure

Tools Required

J 38491 Spark Plug Heat Shield Removal Tool.

  1. Turn OFF the ignition switch.
  2. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical - 3.8L.

    3. Object Number: 406049 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. Remove the spark plug wires at the rear of the engine using the following steps:
    4. • Note the position of the spark plug wires before removing the wires.
    • Twist the spark plug boot 1/2 turn before removing the boot.
    • Gently pry the heat shield up from spark plugs using the J 38491 .
    • Remove the spark plug wires form the spark plugs at the rear of the engine.

    Object Number: 194231 Size: SH
  4. Remove the spark plug wires (1,3,5) from the spark plugs at the front of the engine using the following steps:
    5. • Note the position of the spark plug wires before removing the wires.
    • Twist the spark plug boot 1/2 turn before removing the boot.
    • Gently pry the heat shield up from spark plugs using the J 38491 .
    • Remove the spark plug wires form the spark plugs at the front of the engine.

    Object Number: 194253 Size: SH
  5. Remove the spark plug wires from the wire looms.
  6. When replacing the spark plug wires transfer any of the following:
    7. • Boot heat shields
    • Spark plug wire conduit
    • Spark plug wire retaining clips

Installation Procedure

    Object Number: 194220 Size: SH
  1. Spark plug wires to the engine.

    2. Object Number: 194231 Size: SH
  2. Connect the spark plug wires to the ignition coil in the proper position. Left side spark plug wires (1,3,5) shown.

    3. Object Number: 162190 Size: SH
  3. Connect the spark plug wires to the wire looms.

    4. Object Number: 194244 Size: SH
  4. Connect the spark plug wires to the spark plugs in the proper position. Right side spark plug wires (2,4,6) shown.
  5. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical - 3.8L.