Regal V6-191 3.1L VIN M SFI (1995)
EGR Valve: Description and Operation
Digital EGR Valve
Digital EGR Solenoid Wiring Schematic
PURPOSE
The digital Exhaust Gas Recirculation (EGR) valve is designed to accurately supply EGR to an engine, independent of intake manifold vacuum.
The valve controls EGR flow from the exhaust to the intake manifold through three orifices which increment in size to produce seven
combinations. When a solenoid is energized, the armature, with attached shaft and swivel pintle is lifted, opening the orifice. The flow accuracy is
dependent on metering orifice size only, which results in improved control.
OPERATION
The swivel pintle feature insures good sealing of exhaust gas, reducing the need of critical assembly alignment. In addition, the effects of EGR
leakage on idle quality are reduced because the shaft and seals are exposed to exhaust pressure instead of manifold vacuum. The shafts are sealed
from the exhaust chamber by floating seals held in place by the seal spring. These springs also hold the upper seals that seal the armature cavity in
the solenoids.
The solenoid coils are fastened together to maximize reliability and to seal the coils from the environment. The coils use a common power terminal
with individual ground terminals.