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 EGR valve (dual EGR valve on California models) and a throttle operated Sub EGR valve. The vacuum applied to the vacuum operated valve is controlled by a thermo valve (dual thermo valve on California models).