GM Celebrity/Century/Ciera/6000 1982-1996 Repair Guide

Mixture Control Solenoid (M/C)

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The fuel flow through the carburetor idle main metering circuits is controlled by a mixture control (M/C) solenoid located in the carburetor. The M/C solenoid changes the air/fuel mixture to the engine by controlling the fuel flow through the carburetor. The ECM/PCM controls the solenoid by providing a ground. When the solenoid is energized, the fuel flow through the carburetor is reduced, providing a leaner mixture. When the ECM/PCM removes the ground, the solenoid is de-energized, increasing the fuel flow and providing a richer mixture. The M/C solenoid is energized and de-energized at a rate of 10 times per second.

 
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