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EGR Control Solenoid: Description and Operation

EGR System:

OPERATION:
To regulate Exhaust Gas Recirculation (EGR) flow a control module controlled solenoid is used in the vacuum line. This is a normally closed solenoid vacuum valve which is opened when the control module completes the ground. The control module will energize the EGR solenoid (EGR ON) when the engine is warm and above idle. There is little EGR flow at wide open throttle due to lack of engine vacuum.