Exhaust Gas Recirculation: Description and Operation

EGR SYSTEM COMPONENTS




EGR System Description
- The Exhaust Gas Recirculation (EGR) system controls the oxides of nitrogen (NOx) emissions. To lower NOx emissions, the temperature in the combustion chamber must be decreased. This is accomplished by recirculating small amounts of exhaust gases back into the combustion chamber to mix with the air/fuel charge.
- The 2.3L engine incorporates a stepper motor controlled EGR valve which receives its signal from the PCM. Engine coolant is used to cool the EGR valve. The EGR valve and stepper motor are serviced as an assembly.