does anybody know what the load control valve does? second set of pics I think. my old carb had a port on the back for it, but the new one does not. can I plug it?
Vacuum Vent Control Valve (LCV in some Vacuum Diagrams:, Also called the Load Control Valve (LCV);
D7TZ-9H301-A .. "T/E (Thermactor Emission-smog pump) Vacuum Vent Control Valve Assy" / Marked: D7TE-9H301-AA or D8TE-9H301-AA / Obsolete
Applications: 1977/79 F100/350 & 1978/79 Bronco.
414 Umbarger Rd #E
San Jose, California 95111
Call Green Sales @ 1-800-543-4959 for current availability and pricing on Ford and Lincoln Mercury Parts
PART #: D7TZ9H301A
Description: . Alternate #: D7TZ-9H301-A, D7TZ*9H301*A
No other FoMoCo Dealer or obsolete parts vendor has any.
EGR SYSTEM WOT (WIDE OPEN THROTTLE) LOAD CONTROL VALVE
Some EGR systems feature a load control valve that closes the EGR valve when the engine requires maximum power at or near wide open throttle.
The valve is installed in vacuum line between the ported vacuum connection on the carburetor & EGR valve; vacuum line from carburetor venturi vacuum tap is connected to the top part on the WOT valve and provides control for the valve. When venturi vacuum is at a predetermined level near wide open throttle, it is strong enough to overcome the calibration spring pressure and unseat the diaphragm valve, diverting EGR source vacuum to the atmosphere and causing the EGR valve to close. Normal EGR flow is resumed when there is a reduction in engine load from the wide open throttle condition.