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Speedy Squirrel Speedy Squirrel is offline
Rocket Scientist
Join Date: Jun 2008
Location: Detroit
Posts: 906
All of the '80's Motronic distributors have, shockingly enough, a mechanical advance mechanism. The actual timing is provided to the ECU via the sensors and tooth arrangement on the flywheel. These are used to both measure the actual timing, and set the actual timing. The mechanical advance does it's thing, and the Motronic does it's thing to come up with the desired ignition timing.

In the event that the electronics go tilt, the engine is assured of getting the mechanical advance to keep from melting the catalyst.
Old 07-06-2014, 06:41 PM
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