K 2500 Truck 4WD V8-350 5.7L VIN K TBI (1995)
EGR Electronic Vacuum Regulator Solenoid: Description and Operation
EVRV Solenoid
PURPOSE:
To regulate EGR flow, a control module controlled Electronic Vacuum Regulator Valve (EVRV) solenoid is used in the vacuum line. The control
module uses information from the following sensors to regulate the solenoid:
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Engine Coolant Temperature (ECT) Sensor.
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Throttle Position (TP) sensor.
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PRNDL position.
-
Distributor (rpm signal).
OPERATION:
The EGR vacuum control has an EVRV solenoid that uses Pulse Width Modulation (PWM). This means the control module turns the solenoid ON
and OFF many times a second and varies the amount of ON time (pulse width) to vary the amount of EGR.