Sovereign L6-4.0L (1991)
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EGR Valve: Description and Operation
The EGR control valve is a "negative pressure" vacuum operated valve that compensates for exhaust back pressure. The amount of exhaust gas flow into
the intake manifold varies depending on intake manifold vacuum and variations in exhaust back pressure. The valve diaphragm has an internal vacuum
bleed hole that is held closed by a small spring when no exhaust back pressure exists. When vacuum is applied via the solenoid vacuum valve, the EGR
valve opens against the pressure of the large spring. When intake manifold vacuum combines with negative exhaust back pressure, the vacuum bleed
hole opens to close the valve.
EGR Valve
Exploded View