GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC C-Series Medium Duty Truck B7 🢒 Engine 🢒 Engine Controls - 7.4L 🢒 Spark Plug Wire Harness Replacement

Removal Procedure

    Object Number: 213856 Size: SH
  1. Disconnect the spark plug wire (5) at each spark plug.
    2. • Twist each spark plug 1/2 turn.
    • Pull only on the boot in order to remove the wire from each spark plug.
  2. Disconnect the spark plug wire from the ignition coil.
    3. • Twist each spark plug boot 1/2 turn.
    • Pull only on the boot in order to remove the wires from the ignition coil.

Installation Procedure

    Object Number: 213850 Size: SH
  1. Install the spark plug wires (8) 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.