EGR System: Description

The exhaust gas recirculation (EGR) system is used to help control formation of NOx emissions. By recycling some exhaust gas from exhaust ports back to the intake system, combustion temperatures are lowered, which helps keep NOx emissions down.

The system consists of EGR valve, EGR pipe, thermo vacuum valve, and control valve orifice (except California and Federal models with Auto. Trans.)