Dual EGR Control Valve System

Fig. 26 Dual EGR control valve. 4-156/2.6L engine:

Fig. 27 Thermo valve. 4-156/2.6L engine:

4-156/2.6L Engine
The dual EGR control valve, Fig. 26, consists of primary and secondary valves, which are controlled by different carburetor vacuums in response to throttle valve openings, while the EGR flow is suspended at idle and wide open throttle operation. The primary valve controls EGR flow during part throttle operation, while the secondary control valve allows recirculation of exhaust gas into the intake manifold when the throttle valve is further opened. Vacuum applied to the dual EGR control valve is controlled by a thermo valve, Fig. 27.