Do spark plug wires go bad over time?
Do spark plug wires go bad over time? Spark plug wires are expected to wear out eventually, often after 60,000 to 100,000 miles, though that can vary by manufacturer. They can also become faulty ahead of schedule. Oil or coolant leaks can damage ignition wires. To prevent reoccurring problems, the leaks will need to be repaired as well. When do you need to change spark plugs? Spark plugs before then would need to be changed out a lot sooner, more like the 30-40k mile range. As plugs get older and the electrodes begin to wear away, ignitions systems today can...