Quote:
Originally Posted by Piwoslaw
How a certain engine reacts to adding/removing EGR seems to be a highly individual thing. Some report milage going up, others down. I read recently that in newer cars the ECU has so much control over the engine that EGR operation is almost unnoticible, so we have cleaner cars without sacrificing performance.
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I have not researched the differences in diesel EGR in the US vs. Europe, but I hear the US has stricter standards for NOx and thus flows more EGR. That causes definite problems with intakes, reduces mileage, and makes it necessary to have EGR coolers on the newer diesels.
The US Jeep Liberty (Cherokee in Europe) CRD will develop serious issues with the manifold sensors, the EGR valve and FCV (flow control valve) if left alone from the factory, not to mention intake cleaning is prohibitively expensive due to the labor involved in removing the manifold. Just do a search in the CRD section of lostjeeps.com if you want data on EGR related failures. Green Diesel Engineering has adopted this orphan vehicle, and is doing excellent work in optimizing the EGR flow to the point where it stops causing problems. An ECO tune is out of my reach at the moment; soon, but not yet.