Vacuum Regulator Valve: Description and Operation

DESCRIPTION

Vacuum Regulator Valve:

The vacuum regulator valve is used on some models equipped with the 7.3L diesel engine to provide a vacuum signal which is proportional to throttle position.

OPERATION
A constant vacuum source is supplied to the vacuum regulator valve by an engine driven vacuum pump which also delivers vacuum to other accessories. The vacuum regulator valve regulates an output vacuum signal to the transmission's vacuum diaphragm. As the throttle is opened, regulated vacuum from the vacuum regulator valve decreases. In the event a malfunction should occur within the vacuum regulator valve, the valve will cause a zero (0) vacuum signal to be transmitted to the diaphragm which will cause delayed and harsh shifts to occur. Anytime delayed or harsh upshifts are encountered, the performance of the vacuum regulator valve should be checked prior to performing any transmission repairs.

NOTE: Should the vacuum regulator valve be replaced or the fuel injection pump removed, the vacuum regulator valve must be adjusted.

LOCATION
The vacuum regulator valve is located on the fuel injection pump, and is actuated by the throttle lever.