Cutlass Supreme V6-260 4.3L DSL (1985)
EGR Response Vacuum Reducer Valve (EGR-RVR): Description and Operation
This valve is used on diesel engines. The Response Vacuum Reducer Valve is located in the vacuum line between the torque converter clutch solenoid
and the vacuum regulator valve and allows the EGR valve to change position quickly as throttle position is changed.
