Exhaust Emissions System - Exhaust Gas RECIRCULATION: Description

All models are equipped with an Exhaust Gas Recirculation (EGR) system. This system is designed to reduce the formation of oxides of nitrogen (NOx). This is accomplished by recirculating a small amount of exhaust gases back into the intake manifold where it mixes with the air/fuel mixture. By adding these gases to the air/fuel mixture, the combustion temperatures are lowered, thereby reducing NOx emissions. The 1977-79 EGR system consists of an EGR control valve, a thermo/vacuum valve, and an exhaust pressure transducer (if equipped).