The AMC Computerized Engine Control is an electronic fuel feedback system is similar to those used by other automakers at the time by controlling the amount of gasoline to be atomized by the carburetor by precise electronic calculations. The AMC CEC was unique in that almost all of its sensors and actuators were
digital; instead of the usual analog throttle position, coolant temperature, intake temperature, and manifold pressure sensors, it used a set of fixed pressure- and temperature-controlled switches (as well as a wide-open throttle switch on the
carburetor) to control fuel mixture and ignition timing. The only analog sensor in the system was the
oxygen sensor. In other respects, it was a typical
feedback carburetor system of the early-1980s, using a
stepper motor to control fuel mixture and a two-stage "Sole-Vac" (which used a
solenoid for one stage, and a vacuum
motor for the other) to control idle speed. The CEC also controlled ignition timing using information from the fuel-control section and an
engine knock sensor on the intake manifold. The CEC module itself (the most common version of which is the "AMC MCU Super-D") was manufactured for AMC by
Ford Motor Company, and worked with a
Duraspark ignition system. Although built by Ford, the CEC module is not related to the
Ford EEC systems internally. The AMC CEC went through at least four revisions. • The fourth version followed shortly. ==Maintenance==