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. Three systems are used: The one EGR valve system (GLC, except Calif. Auto. Trans. and B2000 Models) consists of an EGR valve, water thermo valve and vacuum amplifier. The two EGR valve system (Calif. Auto. Trans. GLC Model), consists of 2 EGR valves, 2 three-way solenoids, a water thermo valve, accelerator switch, speed switch and vacuum amplifier. The modified two EGR valve system (626 Models), consists of 2 EGR valves, 2 water thermo valves, a vacuum amplifier and vacuum delay valve.