Bronco L6-300 4.9L VIN Y 1-bbl (1983)
Fig. 48 Venturi vacuum amplifier
A Venturi Vacuum Amplifier, Fig. 48, uses a weak venturi vacuum signal to produce a strong intake manifold vacuum to operate the EGR valve,
thereby achieving an accurate, repeatable and almost exact proportion between venturi airflow and EGR flow. This assists in controlling oxides of
nitrogen with minimal sacrifice in driveability.
There are four basic types of EGR valves: the ported type, the integral back pressure type, the electronic-sonic type and the valve and transducer
assembly type
The electronic-sonic type valve is used with the EEC system.
Fig. 6 EGR valve position sensor
