When do I need to change my ignition wires? My original GM wires are still in my 1993 vehicle looks and works fine to me. I can wet the whole engine (i.e. engine cleaning) and still be able to start the car but yet my local garage said I should replace them as part of regular engine tune-up. They said to me something about resistance (high or low) that could damage my ignition coils. How should I check my ignition wires and when should I replace them?
P.N