The spark plug wire is vital to your vehicle because it helps start the car. The electricity travels from the ignition coil to the spark plug wires to reach the spark plug.
Spark plug wire detailsSpark plug wires have insulation that is many times thicker than the conductor, which is made of flexible material. The conductor is also made of a material like silicone or EPDM rubber. The insulation keeps the cable from arcing into an engine component.
The end of a spark plug wire has metal terminals that clip on the spark plug as well as the distributor, or magneto. And the wire from each spark plug is the perfect length to reach the distributor, so no excess wire will be left hanging.
Common issues with a bad spark plug wireA bad spark plug wire can show symptoms of corrosion of the terminals, engine misfiring, or the engine is idling rough.