Ignition Coil: Description and Operation

The ignition coil contains two separate Coils. Each coil fires two spark
plugs simultaneously, one on the compression stroke and one on the exhaust stroke.
- The majority of the ignition coil energy is used by the spark plug on the compression stroke.
- The firing voltage of one spark plug is negative with respect to ground, while the firing voltage of the other spark plug in the cylinder pair is positive with respect to ground.