Ignition Coil Pack

Coil Pack

Example: Six-Tower Coil Pack:

A coil in a coil pack is turned on (for example is coil charging) by the PCM, and is turned off when firing two spark plugs at once. The spark plugs are paired so that as one spark plug fires on the compression stroke, the other spark plug fires on the exhaust stroke. The next time the coil is fired the order is reversed. The next pair of spark plugs fire according to the engine firing order.

The ignition coil:
^ changes low voltage pulses from the powertrain control module to high voltage pulses.
^ sends high voltage pulses to the spark plugs through the spark plug wires.
^ has three transformers.
^ has six spark plug wires, one to each end of each transformer.
^ is mounted on top of the intake manifold.