Exhaust Emissions System - Exhaust Gas RECIRCULATION: Description
The Exhaust Gas Recirculation (EGR) system is designed to lower the burning temperatures of gases in combustion chambers, thereby reducing formation of oxides of nitrogen (NOx). Metered amounts of exhaust gas dilutes the air/fuel mixture to lower combustion temperatures.
On 1976-78 models, system consists of EGR valve, three-way solenoid valve, water thermo switch, and vacuum amplifier. On 1979 models, system consists of an EGR valve, water thermo valve, and vacuum amplifier (if equipped).