EGR System - Gasoline: Operation: Notes
The EGR valve opens to allow small metered amounts of exhaust gas into the intake manifold, as a result of intake manifold vacuum. The EGR valve opens only when the solenoid valve is energized. The solenoid valve only energizes when transmission is not in 5th gear, coolant temperature is above 113°F (45°C), and engine is not accelerating.