EGR System - Gasoline: Description

Exhaust gas recirculation system is used to reduce oxides of nitrogen (NOx) by recycling some exhaust gas back into the intake manifold to lower combustion chamber temperatures.

EGR valve is mounted under intake manifold. EGR system consists of an EGR valve, a back pressure transducer which monitors exhaust system pressure and a thermal vacuum valve which senses coolant temperature.