Bronco L6-300 4.9L VIN Y 1-bbl (1983)
Air Injection Control Valve: Description and Operation
Thermactor Vacuum Vent Valve
Fig. 76 Thermactor vacuum vent valve
Fig. 77 Thermactor vacuum vent valve schematic (typical)
This valve, Figs. 76 and 77, is used on some engines equipped with variable venturi carburetor. It provides the air for the thermactor retard delay
valve and air bypass valve during idle modes to deactivate the thermactor system after a controlled period of time. Application of vacuum from the
carburetor to both ports of the thermactor vacuum vent causes the dump valve to seat and vacuum to be applied to the rest of the system. Removal of
