AMC computerized engine control

The Computerized Engine Control, also called Computerized Emission Control or CEC, was an engine management system designed and used by American Motors Corporation and Jeep on its four- and six-cylinder engines from 1980 until 1987, and then through 1990 by Chrysler after it acquired AMC. It was built around three main parts: a control computer, an electrically controlled carburetor and an oxygen sensor in the exhaust. American Motors did not build its own engine computers, so the modules were made for it by Ford's Motorcraft division. From 1980 to 1985 the system used oxygen sensor feedback to adjust the air-fuel mixture at the carburetor, bridging carburetors and fuel injection, and from the 1986 model year the four-cylinder engines moved to single-point throttle body injection under a fully computerized control that also managed ignition timing, idle speed and exhaust gas recirculation. The system went through at least four revisions and gained a reputation for being hard to tune.