EGR System: Description

The Exhaust Gas Recirculation (EGR) system is used to help control formation of NOx emissions. The EGR introduces exhaust gases back into intake system. The exhaust gases lower top combustion temperatures, which help keep NOx emissions down.

The system consists of an EGR valve, EGR pipe and thermo vacuum valve. An EGR leak orifice is used on MPI models, and also on federal models with manual transmissions.