The first is the type of ignition coil. There are two main types: coil-on-plug and coil pack. Coil-on-plug ignition systems have a separate ignition coil for each spark plug, while coil pack ...

They have separate ignition coils for each cylinder that connect directly to the spark plugs or, in some instances, one coil for every two cylinders and short ignition wires from the coils to the ...