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Home >> BMW >> 1979 >> 633CSi Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Gas RECIRCULATION >> Operation >> Switching Valve
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Switching Valve

The switching valve switches off the EGR valve at temperatures below 113°F (45°C) and at speeds above 3750 RPM. This switching valve is regulated by a temperature switch, a switching relay and a speed switch. The switching valve controlling the EGR valve can be identified by a Red cap.