G 2500 3/4 Ton Van V8-350 5.7L VIN K TBI (1995)
EGR Electronic Vacuum Regulator Solenoid: Description and Operation
EVRV Solenoid
EGR & EVRV Solenoid
OPERATION
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.
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Distributor (RPM signal).
The EGR vacuum control has an EVRV solenoid that uses "pulse width modulation." 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.