2.6 Liter EGR System
The Dual EGR valve has primary and secondary valves which respond to different carburetor vacuums according to throttle opening. EGR operation is suspended at idle and wide open throttle. The primary valve controls EGR flow at relatively narrow throttle openings, while the secondary control valve admits exhaust gas into the intake mixture at wider throttle openings. Vacuum applied to the dual EGR control valve is controlled by a thermo valve. The sub EGR valve is part of the throttle body and is mechanically linked to the throttle. Two thermo valves sense coolant temperature at the intake manifold and prevent operation of the dual EGR valve below certain temperatures.