Kit cars in the USA

   
 "Dedicated to American Kit Cars" Information about Kitcar USA.com Contact Kitcar USA.com         Home of American kit cars - Kitcar USA.com Kitcar articles All the latest kit car news Kit car discussion for the enthusiast

Search

Manufacturers
Kit Cars
Car Spec Sheets
Picture Gallery
Kit Car Clubs
Build cost estimator
Kit Cars for sale
Madabout-Kitcars
Classic-Kitcars

 

CATEGORIES (articles) > Engines > Technical > AMC Computerized Engine Control

AMC Computerized Engine Control


The Computerized Engine Control or CEC system was a engine management system designed and used by American Motors and Jeep from 1980-1990, on the AMC 258 engine.

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. CEC also controlled ignition timing using information from the fuel-control section and a knock sensor on the intake manifold.

The CEC module itself (the most common version of which is the "AMC MCU Super-D") was built for AMC by Ford Motor Company, and worked with a Ford Duraspark ignition system. Despite being built by Ford, the CEC module is not related to the Ford EEC systems internally.

Because of the many vacuum-driven components and electrical connections in the system, CEC-equipped engines have a reputation of being hard to tune. The 49-state model of the CEC has no on-board diagnostic system, making it difficult to monitor the computer's operation without a breakout box, and the Carter BBD carburetor on most CEC-equipped models has problems with its idle circuit clogging, causing rough idle and stalling. In places where emissions testing isn't required, a popular modification is to bypass the computer and replace the BBD with a manually-tuned carburetor; also, several vendors (including Chrysler) offer retrofit kits that replace the CEC and the carburetor with fuel injection.






CATEGORIES (articles) > Engines > Technical > AMC Computerized Engine Control

 
Search for keyword     



This content from Wikipedia is licensed under the GNU Free Documentation License.


copyright KitcarUSA.com 2017
terms and conditions | privacy policy