Ignition Wire Set - Direct Ignition

The ignition wire set for direct ignition takes the ignition spark from the ignition coil(s) or coil pack and delivers it to the spark plugs.

Shielded in rubber, these wires will wear out over time and cause the engine to misfire and run poorly. Direct ignition wire sets are designed to handle the higher system voltages of direct ignition systems, i.e. 80,000–100,000 volts verses 40,000–50,000 volts for a conventional ignition system. It is common to have to replace the wire set once or twice during the vehicle's life.

Note: Engines that feature an individual coil for each cylinder (described as coil-on-plug (COP) ignition) do not use ignition/spark plug wires.