Ignition Coil: Description and Operation

Ignition Coils:

Ignition Coils
The following are the 2 different manufacturers for the ignition coils.
- Melco (1), square design
- Delphi (2), round design


These 2 coils use 2 different spark plug wire lengths, and mounting brackets.

Each ignition coil has an ignition 1 feed and a ground. The PCM supplies a low reference and an ignition control (IC) circuit. Each ignition coil contains a solid state driver module as the primary element. The PCM signals the coil driver to initiate a firing event by applying the IC circuit voltage for the appropriate time, or dwell. When the voltage is removed the coil fires the spark plug. The coils are current limited to prevent overloading if the IC current is held high too long.







Ignition Coil Mounting Brackets
The following are the 2 different types of mounting brackets.
- Melco (1), square design
- Delphi (2), round design

The ignition coil mounting brackets must match the appropriate coil type.

Spark Plug Wire Length V8:

The following are the 2 different lengths of spark plug wire.
- Melco (1), square design-Uses a spark plug wire that is 145 mm length cable seal to cable seal.
- Delphi (2), round design-Uses a spark plug wire that is 110 mm length cable seal to cable seal.

The ignition coil wires must match the appropriate coil type.

The spark plugs are connected to their respective coils by a short secondary wire. The plugs are tipped with platinum for long wear and higher efficiency.