Exhaust Gas RECIRCULATION (EGR) System: Description

The Exhaust Gas Recirculation (EGR) System used on all Courier models is designed to reintroduce a small amount of exhaust gases into the combustion cycle, thereby reducing combustion temperatures and reducing the generation of oxides of nitrogen (NOx). The amount of exhaust gases reintroduced and the timing of the combustion cycle are controlled by various factors such as engine vacuum and temperature. The EGR system's main components are the EGR valve, thermo valve(s), three-way solenoid valve (if equipped), and vacuum amplifier.