EGR System: Description

The exhaust gas recirculation system is designed to control formation of NOx emissions. This is done by reintroducing some exhaust gas back into the combustion chamber. The exhaust gases are lower in temperature than the combustion flame. By reducing combustion chamber temperatures, NOx formation is reduced.

The system includes an EGR valve, solenoid valve, 5th gear transmission switch, coolant temperature switch, pressure surge valve and vacuum reservoir. See Figure .