Different ignition systems (Audi A4 B5)

The 74 kW engine is equipped with a Motronic ignition system with a distributor. In this engine, the ignition timing is adjusted, i.e. the ignition timing is adjusted to each operating situation of the engine – this is done exclusively electronically.

The 92 kW engine is equipped with a distributorless Motronic ignition system. In this ignition system, there is one ignition coil per two cylinders. It provides a spark when one of the two cylinders needs it. This makes the ignition distributor redundant. A side effect of this division is that each cylinder receives one more spark during the exhaust stroke during one working cycle (unnecessary but harmless) spark.

The 110 kW four-cylinder engine also features a distributorless Motronic ignition system. The difference to the 92 kW engine: here, each cylinder has its own ignition coil with its own control. There is no unnecessary spark, and each cylinder can be controlled separately.

The MPI and MPFI ignition system of the six-cylinder engine is an integral part of the engine management. Here, as in the 92 kW engine, there is one ignition coil for every two cylinders.

[The original text is available on the website: AudiManual.ru]