Ignition System: Description and Operation

Component Locations:

The 5.4L and 6.8L engines are equipped with a coil on plug ignition system. This system has a separate ignition coil mounted on each spark plug. Operation of the coils is controlled by the Powertrain Control Module (PCM), which computes ignition timing based on inputs from the electronic engine control system sensors.

The ignition coils change the low voltage signal from the powertrain control module into high voltage pulses to the spark plugs.

The ignition system is set for base timing at 10 degrees Before Top Dead Center (BTDC) and is not adjustable.

Refer to Specifications for firing order.