GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2001 🢒 Sonoma Pickup - 2WD 🢒 Engine 🢒 Engine Cooling 🢒 Spark Plug Wire Replacement

Removal Procedure

    Object Number: 370382 Size: SH
  1. Disconnect the spark plug wire at each spark plug:
    2. • Twist the boots one-half turn before removing.
    • Pull only on the boot or use a tool designed for this purpose in order to remove the wire from each spark plug.

    Object Number: 175522 Size: SH
  2. Disconnect the spark plug wire from the coil:
    3. • Twist each spark plug boot 1/2 turn.
    • Pull only on the boot or use a tool designed for this purpose in order to remove the wires from the coil.

Installation Procedure

    Object Number: 175522 Size: SH
  1. Install the spark plug wires at the coil.
  2. Install the spark plug wire to each spark plug.

    3. 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.

  3. Inspect the wires for proper installation:
    4. • Push sideways on each boot in order to inspect the seating.
    • Reinstall any loose boot.
    • Wire routings must be kept intact during service and followed exactly when wires have been disconnected or when replacement of the wires is necessary. Failure to route the wires properly can lead to radio ignition noise and crossfiring of the plugs, or shorting of the leads to the ground.
    • Any time the spark plug wires or boots are installed on the spark plugs, new dielectric grease needs to be applied inside the boot.