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Ignition Wire Set

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
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