The Exhaust Gas Recirculation (EGR) system is used to reduce Oxides of Nitrogen (NOx) in the engine exhaust. This is accomplished by allowing a predetermined amount of hot exhaust gas to recirculate and dilute the incoming air and fuel mixture. This process reduces peak flame temperature during combustion. The system uses a vacuum-controlled Exhaust Gas Recirculation (EGR) valve, in order to modulate exhaust gas flow from the exhaust manifold into the intake manifold.
| Fig. 1: Typical EGR system schematic — 2.4L
engine shown, others similar
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