Ranger 4WD V6-183 3.0L (1993)
Vacuum Controller: Description and Operation
VACUUM REGULATOR VALVES
LOCATION
The Vacuum Regulator Valve (VRV) is located within the vacuum hose routing or harness assembly.
PURPOSE
The VRV is designed to provide a constant vacuum output.
TYPES
2-Port Vacuum Regulator
The 2-Port Vacuum Regulator Valve - maintains a constant vacuum output signal, while source vacuum is greater than the pre-set calibration of
the valve.
If the input source vacuum falls below the pre-set calibration, the 2-port VRV output vacuum signal will be equal to the input source vacuum.
3-Port Vacuum Regulator
Vacuum Regulator (3 & 4 Port)
The 3-Port and 4-Port Regulators - are used to control the vacuum signal to the vacuum advance unit of the distributor. During engine idle, the
manifold vacuum input signal is limited to a constant output signal.
Once the engine is off-idle, the output signal will equal the spark port.
