The ignition (or spark plug) wire set takes the spark created by the ignition coil(s) and delivers it to the spark plugs.
Symptoms of Wear or Failure
- The engine may be hard to start or not start at all
- Engine may run roughly
- Lack of power on acceleration
- Check Engine Light illuminate and/or flash
Related Repair Advice
- Continuing to drive with the above mentioned symptoms can damage the catalytic converter
- It is common to replace the wire set once or twice during the vehicle's life
- We recommend replacing the ignition wires if they have more than 60,000 miles on them and especially if other ignition components are being replaced
- Engines that feature an individual coil for each cylinder—described as coil-on-plug (COP) ignition—do not use ignition/spark plug wires
- Ignition wire failure can be caused by failures elsewhere in the ignition system. The ignition coils and spark plugs should be thoroughly inspected and tested.
- Oil or coolant leaks can damage ignition wires. To prevent reoccurring problems, the leaks will need to be repaired along with the ignition wires.
- Care should be taken when servicing the ignition system as up to 45,000 volts may be present while the engine is running