vacuum modulated EGR

vacuum modulated EGR
An exhaust gas recirculation in which the amount of exhaust gas admitted to the intake manifold depends on a vacuum signal controlled by throttle position. When the throttle is closed, at idle or during deceleration, there is no vacuum signal to the EGR valve; as the throttle is opened, a vacuum signal is supplied causing the EGR valve to open

Dictionary of automotive terms. 2015.

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