Ignition Cable: Description and Operation

SPARK PLUG CABLES
Spark Plug cables are sometimes referred to as secondary ignition wires. The wires transfer electrical current from the electronic ignition coils to the individual spark plug at each cylinder. The nonmetallic spark plug cables have built in resistance. The cables provide suppression of radio frequency emissions from the ignition system.

Check the spark plug cable connections for good contact at the coil and spark plugs. Terminals should be fully seated over the coil or spark plug. The nipples and spark plug covers should be in good condition. Nipples should fit tightly on the coil and spark plug covers should fit tight around spark plug insulators. Loose cable connections permit corrosion that increases resistance.