What are the signs that my wires need to be changed and is there a good preventative change time?
A. Spark plug wires should be changed when they start to become hard or inflexible, or look dry and cracked. If one wire fails, it’s probably time to change them all. Spark plug wire life varies greatly depending on a number of factors, but you should change them at least as often as manufacturer’s recommendations. Cracked wires can cause misfires resulting in poor performance. This can also cause cross firing, which can result in pre-ignition. An accumulation of grease or oil on the wires may lead to early replacement, and lastly, corrosion at the spark plug terminal or distributor cap may also lead to premature failure.
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