Ignition Coil: Description and Operation

Coil Packs:

Coils are mounted together in a coil pack. These ignition coil packs are triggered by the DIS module and are timed by the EEC IV. Each coil pack contains separate ignition coils. The ignition coil fires two spark plugs simultaneously, one on the compression stroke and one on the exhaust stroke. The spark plug fired on the exhaust stroke uses very little of the ignition coil's stored energy. The majority of the energy is used by the spark plug on the compression stroke. Since these two spark plugs are connected in series, the firing voltage of one plug will be negative with respect to ground, while the voltage of the other will be positive in respect to ground.
The right coil pack receives the following inputs through its harness connector:
PIN 1 (coil 2 primary) is the ground path to pin 10 of the DIS module.
PIN 2 provides battery voltage for the coil primary circuits.
PIN 3 (coil 1 primary) is the ground path to pin 11 of the DIS module.

The left coil pack receives the following inputs through its harness connector:
PIN 1 (coil 4 primary) is the ground path to pin 9 of the DIS module.
PIN 2 provides battery voltage for the coil primary circuits.
PIN 3 (coil 3 primary) is the ground path to pin 8 of the DIS module.

The coil primary current is limited to 5.5 amps (+/- 0.5 amps). The voltage induced into the secondary circuit results in a minimum open circuit voltage of 32,000 volts.