Auto Repair Encyclopedia
Ignition Wire Set
The ignition (or spark plug) wire set takes the ignition spark from the ignition cap and delivers it to the spark plugs. These wires wear out over time and can cause the engine to run roughly. It is common to have to replace the wire set once or twice during the vehicle's life.
Note: Engines utilizing multiple coil packs—also known as a coil-on-plug (COP) ignition—do not use ignition/spark plug wires.
