Vehicle Specific Ignition System

The 4.6L, 5.4L and 6.8L engines are equipped with a coil-on-plug ignition system. Rather than a remotely mounted coil with secondary ignition wires, 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 engine sensors. For additional information on sensor inputs related to ignition timing, refer to Computers and Control Systems.