EGR System - Gasoline: Description

The 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 temperature.

The EGR system on Impulse Turbo models consists of an EGR valve, and a vacuum switching valve. The EGR system on other models consists of an EGR valve, a back pressure transducer (which monitors exhaust system pressure), and a thermal vacuum valve which senses coolant temperature.