Quote:
Originally Posted by Daox
Why would we not want high EGR flow at idle and light loads? Pumping losses are the greatest when the throttle is closed or close to it. Low speed city driving mileage would be noticeably improved.
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As the quote you used yourself said: "No EGR flow should occur during conditions when EGR operation could adversely affect engine operating efficiency or vehicle driveability (engine warm up,
idle, wide open throttle, etc.)"
At low throttle openings and low engine speed, EGR makes the vehicle run extremely roughly -- I've experienced this myself.