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Ignition Coil/Coil Packs/Coil-On-Plug

The ignition coil, used on all three generations, steps up low voltage to the high voltage needed to ignite the air-fuel mixture. Some engines have only one coil, while others have a coil for each cylinder. The EI generation has coil packs. These packs are a series of coils to induce voltage for each individual cylinder. Some EI systems use coil-on-plug (COP) technology. Spark plug wires are eliminated by using boots to connect the coils directly to the spark plugs. The COP ignition system is more reliable because high voltage plug wires often cause problems over time.