The MPI ignition system is used on the 7A engine and is similar to the Motronic system described in Chapter 9.
In addition to the Hall sensor in the distributor, the MPI system is equipped with an ignition timing sensor that monitors the position of the crankshaft via a rotating toothed segment.
The article is a reprint of material from AUDIMANUAL
MPI Ignition System — Description (Audi 80 B3)
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