Fuel Control
A feedback carburetor is used which contains an electronically operated mixture control (M/C) solenoid. The M/C solenoid controls a metering rod in the float bowl. The metering rod system supplements fuel supplied by the idle and main systems in the carburetor. It varies the air/fuel ratio within a precalibrated range.
The M/C solenoid also controls air/fuel ratio through the use of an idle air bleed that operates in conjunction with the metering rod. A problem in the M/C solenoid circuit may set a Code "23" or "54".