Controlled Catalytic Converter (C-4) System: Description

The Computer Controlled Catalytic Converter (C-4) system is used on all California Jeep models equipped with 151" 4-cylinder engines. The C-4 system closely controls air/fuel ratio through a feedback system from an oxygen sensor mounted in the exhaust manifold. The major components of this system include an exhaust gas oxygen sensor, an electronic control module (ECM), a special electronically controlled carburetor (Rochester Model E2SE) and a three-way catalytic converter.