Auto Repair Encyclopedia
Ignition Wire Set Replacement
Sometimes referred to as Ignition Wire Set, Replace Ignition Wire Set, Ignition Wire Set Replace, Ignition Wire, Replace Ignition Wire, Ignition Wire Replace, Ignition Wires, Replace Ignition Wires, Ignition Wires Replace
The ignition coil generates the "spark" required to ignite gasoline. The ignition wire set (also know as the spark plug wires) conducts the spark generated by the ignition coil to the ignition distributor.
As the engine rotates, it operates the ignition distributor, synchronizing the delivery of the spark to the corresponding spark plug in each engine cylinder. The ignition wire set conducts the spark from the ignition cap to the spark plugs. To maintain synchronization, it is best to replace the spark plug wire set one wire at a time.
To replace a spark plug wire, the wire is removed from the distributor cap at one end and from the spark plug at the other end, then replaced.
Correct routing of the ignition wire set is critical to ensure that the spark plug wires don’t come into contact with rotating engine components or rest on the hot exhaust manifold.
Depending on what is required, the spark created by the ignition system ranges from 12,000 to 45,000 volts. Due to the high voltage, it’s critical that ignition system components are well insulated. If insulation breaks down, the spark never arrives at the spark plug, causing the engine to run poorly—or not at all.
About this Repair: Ignition Wire Set Replacement
Recommendations
We recommend considering replacing the ignition wires if they have more than 60,000 miles on them, especially if other ignition components are being replaced.
Why this happens
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. The leaks will need to be repaired along with the ignition wires to prevent reoccurring problems.
Failing ignition wires can cause the engine to misfire or lack power when accelerating. The Check Engine Light may start flashing and continuing to drive under these conditions can damage the catalytic converter.
