Mixture Control Unit

Mixture Control Unit:

The Mixture Control Unit is located on the right side of the engine compartment forward of the shock tower. The Mixture Control Unit is the heart of the CIS-E Motronic injection system. This is where the air-flow measurement system and the fuel delivery system interact. The Mixture Control Unit measures the engines intake air, and then meters fuel in proportion to that air flow.

The Mixture Control Unit is actually the combination of two separate components: the air flow sensor, and the fuel distributor. The air flow sensor measures the air entering the engine. The fuel distributor, in turn, delivers a proportional amount of pressurized fuel to the fuel injectors.

A potentiometer on the side of the Mixture Control Unit responds to movement of the air flow sensor plate. Input voltage is fixed. Output voltage from the potentiometer changes as the air flow sensor plate moves. The Motronic control unit interprets the changing voltage signal as an indication of engine load. This input is used to control ignition timing, acceleration and full-throttle enrichment, and several other functions. For more information on the air flow sensor potentiometer refer to, COMPUTERIZED ENGINE CONTROLS.