Ignition Coil Pack: Description and Operation

PURPOSE
The ignition system uses a Coil Pack consisting of three double-ended ignition coils to fire the six cylinders. The three coils are combined into a single component.

OPERATION
When the ignition coil fires, spark is supplied to two cylinders at the same time. One plug fires during the compression stroke and ignites the fuel mixture and at the same time the other plug fires during the exhaust stroke.

Coil Firing Diagram:

For Example:

When the spark plug for cylinder # 1 fires on its compression stroke, the spark plug for cylinder # 6 fires during its exhaust stroke.

After 360° of crankshaft revolution, cylinder # 6 is in the compression stroke and cylinder # 1 is in the exhaust stroke, both spark plugs are fire as before.