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Originally Posted by Duke2.6
One thing that is not clear is if you adjusted your duty cycle before or after you replaced the possibly leaky EGR valve.
Duke
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Well, both. And the fact that I had to readjust duty cycle after the EGR valve replacement indicates there may indeed have been a vacuum leak. Also, I measured vacuum at the intake manifold after EGR valve replacement. It was 15 mmHg at idle and 20 mmHg at 2000 RPM. This would be in agreement with figures posted elsewhere on the forum (I believe by you, Duke).
Thanks again, Bruno