Ignition systems

The waveform image below, was taken from a petrol engine vehicle, which was suffering from a lack of power, caused by low fuel supply pressure. It illustrates the effects on the ignition ‘spark line’, when loaded. This is a twin static or ‘wasted spark’ coil system.

No fuel misfire
Wasted spark ignition primary Low fuel misfire under load

This waveform image is of the same type of ‘wasted spark’ or ‘DIS’ ignition system, as in the above.  Only this is a good sample taken with the engine idling.  No faults.

Ignition primary profile good no load
Wasted spark or DIS ignition profile (no load)