Ignition Wires

Removal

 CAUTION: Do not pull on ignition wire.

When removing ignition wires from spark plugs (12405) , use Spark Plug Wire Remover T74P-6666-A. Grasp and twist the spark plug boot back and forth on the spark plug insulator to free the ignition wire spark plug boot. Use the special tool or equivalent to pull the boot from the spark plug . Do not pull on the ignition wire directly, as it may become separated from the connector inside the boot.

 CAUTION: Do not pull on ignition wire.

When removing ignition wires from the ignition coil (12029) , squeeze the locking tabs of the ignition coil wire retainer and remove using a twisting and pulling motion. Do not pull on the ignition wire.

Installation

 CAUTION: Proper installation of ignition wires is critical to vehicle operation. If one ignition wire is not properly installed on spark plug or ignition coil, both spark plugs connected to that ignition coil may not fire under load.

1. Whenever an ignition wire is removed from a spark plug or ignition coil , or a new ignition wire is installed, Silicone Dielectric Compound D7AZ-19A331-A (in Canada, Motorcraft WA-10) or equivalent meeting Ford specification ESE-M1C171-A must be applied to the boot prior to installation. With a small, clean tool, coat the entire interior surface of the boot with Silicone Dielectric Compound D7AZ-19A331-A (in Canada, Motorcraft WA-10) or equivalent meeting Ford specification ESE-M1C171-A.

2. Install each ignition wire on the proper ignition coil terminal per illustration. The engine cylinder numbers are identified on the ignition coil . Ensure that the ignition coil wire boots are fully seated and that both ignition coil boot retainer locking tabs have engaged.

3. Remove ignition wire separators (12297) from ignition wire set and install ignition wire separators in same relative position on the new ignition wire set. Install ignition wires and ignition wire separators on the engine.

4. Connect ignition wires to proper spark plugs .