EGR Valve

The Exhaust Gas Recirculation (EGR) system distributes exhaust gas into the intake mixture. This lowers combustion temperatures due to lower concentrations of oxygen. Lowering of combustion temperatures reduces amount of NOx emissions.

Turbocharged engine uses an electronic EGR valve where EGR flow is controlled according to ECA demands by means of an EGR valve position sensor attached to the valve. The EGR valve is operated by a vacuum signal from EGR control solenoid valve.

Non-turbocharged engine incorporates a modified ported EGR valve and a remote backpressure transducer where the EGR vacuum applied to EGR valve is modulated by sensing exhaust backpressure and bleeding off some vacuum when the backpressure is low. This provides EGR flow proportional to engine load. Vacuum supplied to EGR transducer is controlled by an EGR control solenoid valve.