4.2L Feedback Carburetor System: Description
The Computerized Emission Control system (CEC) is used on all 6-cylinder models. It is an electronically controlled system that manages the air/fuel ratio and controls the AIR injection, idle speed control, and ignition systems. The primary objective of the CEC system is to maintain an ideal air/fuel ratio of 14.7:1 under all operating conditions. When the ideal ratio is maintained, the catalytic converter can effectively control NOx, HC and CO emissions.