Quote:
Originally Posted by oldbeaver
Hello Cocyclist. You wrote the title of my answer. I agree in general on yr opinion. But would like to have facts to sustain it. Did you make a test with a trip computer installed and on the same tract of road, keeping all conditions "ceteris paribus" but EGR? That is the only valid way. Otherwise it is just a suspition based on a (biased) opinion.
In my car I did the same and the effect was opposite. See my fuel log. I wanted to improve FE, disconnected EGR and FE went worse. There are documented reasons for that. Then I reconnect it back, and FE improved.
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Oldbeaver, You are correct, my methods are not scientific and as I mentioned, I changed the thermostat at the same time. So it is impossible for me to say which caused the change or if it is the combination of both.
I couldn't tell which diesel you were experimenting with but if I recall correctly some TDI owners have suffered worse mileage by disconnecting EGR without addressing the factory tuning parameters. If you are interesting I can try to find the link on TDIclub.