Exhaust Gas RECIRCULATION System: Description

All vehicles are equipped with an exhaust gas recirculation (EGR) system to reduce NOx emissions. With this system, exhaust gas is partially recirculated from an exhaust port of the cylinder head into a port located at intake manifold below the carburetor. Exhaust gas flow is controlled by a vacuum operated dual EGR valve (single EGR valve on Federal Auto. Trans. pickups) and a throttle operated sub EGR valve. Vacuum applied to the EGR valve is controlled by a single thermo valve on Federal Auto. Trans. pickups, a dual thermo valve on all other pickups, a single and a dual thermo valve on Champ and Colt, and 2 dual thermo valves on Challenger and Sapporo.