Quote:
Originally Posted by polinsteve
Sounds a reasonable explanation. I really don't see the point in fiddling the EGR. It is there to reduce emissions and I'm sure that in real world driving, there will be no noticeable performance benefits.
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It was developed as a botch to get around emission regulations, to burn of the Nox at a tickover. Fine when the vehicle is new, but as time goes on and because of the way they work, they have a serious detrimental effect on emissions and performance of the engine.
Oil from the turbo is drawn through the EGR, where in a working EGR the oil film will be burnt onto the EGR, choking that up, the intake manifold and the inlet valves. Cleaning those out thoroughly and regularly, is the only way to maintain low emissions with a working EGR. No car manufactures I have heard of have ever specified this to be done, so their are lots of diesel vehicles running badly, with silly levels of emissions.
Simple fix for many, is to bypass the EGR and clean out as best you can, the intakes of the crude.