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Vacuum modulated EGR
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- An exhaust gas recirculation system where the amount of exhaust gas introduced into the intake manifold is regulated by a vacuum signal controlled by throttle position.
- At idle or during deceleration when the throttle is closed, there is no vacuum signal to the EGR valve, resulting in its closure.
- As the throttle is opened, a vacuum signal is supplied, causing the EGR valve to open and allowing a controlled amount of exhaust gas to recirculate into the intake manifold.
