Ford Probe 1989-1992 Repair Guide

Spark Plug Wires


Visually inspect the spark plug wires for burns, cuts, or breaks in the insulation. Check the spark plug boots and the nipples on the distributor cap and coil. Replace any damaged wiring. If no physical damage is obvious, the wires can be checked with an ohmmeter for excessive resistance and continuity. Resistance should be 5000- per 1 ft. (30.5cm) of cable. Measure the resistance with the plug wire still attached to the distributor cap.

When installing a new set of spark plug wires, replace the wires one at a time so there will be no mix-up. Start by replacing the longest cable first. Install the boot firmly over the spark plug. Route the wire exactly the same as the original. Insert the nipple into the tower on the distributor cap. Repeat the process for each wire. Be sure to apply silicone dielectric compound D7AZ-19A331-A or equivalent to the spark plug wire boots and nipples prior to installation.