Mono-Motronic ignition system for the 74 kW engine. Even with this simplest engine version, ignition timing control – i.e. matching the ignition timing to the respective operating situation – is performed exclusively by electronics.
The KE-Motronic ignition system in 85 kW engines, produced up to 6/92, was responsible not only for injection but also for ignition.
The Digifant ignition system is installed on 85 kW engines with 7/92. The operating principle is the same as the Mono-Motronic system: everything is in one control unit, the ignition timing is controlled electronically.
A fully electronic ignition system (VEZ) is installed on a 5-cylinder engine with a power of 98 kW. Although this ignition system is equipped with its own control unit, the ignition and injection systems are in constant data exchange with each other. The ignition timing is regulated electronically.
The MPI or MPFI ignition systems of 6-cylinder engines are also an integral part of the engine's electrical system. The special feature: these systems perform ignition without a distributor. Accordingly, for every two cylinders located opposite each other there is one ignition coil, which produces a spark only if one of the cylinders needs it. For technical reasons (saving parts) each cylinder gets one more at each engine revolution (unnecessary, but not harmful) spark in time with the release.
Hint: As already mentioned, the different ignition systems have many common features. The ignition systems of 4- and 5-cylinder engines are almost identical. For example, these systems have almost the same high-voltage element in which the spark is created. Serious differences exist only with the ignition systems of 6-cylinder engines.