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ENGINE <NON-TURBO> Control System Operation The EGR system consists of a vacuum solenoid, sure causes the transducer diaphragm to modulate. valve. When activated, the solenoid allows vacuum This allows intake manifold vacuum to reach the to flow to the transducer. Negative exhaust back- EGR valve. The combination of vacuum on one pressure allows manifold vacuum from the solenoid side of the valve diaphragm and exhaust back to vent to atmosphere. Positive exhaust sure on the other allows exhaust gases to be transducer EGR valve An EGR system stuck in the closed position prevents emissions. A tern stuck in the open position can increase carbon emissions, fuel consumption, and produce rough engine operation. |