Fully run in and going strong!
Join Date: Oct 2014
That's a lot for an EGR...
I am guessing that there can only be a few reasons why EGRs fail. Obviously the internal stepper motor could fail, but I have not read about this occuring with any owners. Most likely is that they jam up with too much soot from the exhaust gases.... While there is always soot from a diesel, the only reasons I can think of why that may cause excess soot are:
- ovefuelling, or lack of air/boost (rich mixture)
- long-term low temp running, maybe short journeys, lack of hard work, or high-speed travel
- low-ish cetane number fuel - it burns cooler (I use super diesel most of the time and I can tell the difference, not with soot, but with smoothness and response). Typically supermarket fuel is "base spec", no frills...
- poor, old or wrong grade engine oil (DPF's suffer from this, as they need low ash oil, but it may conceivably affect EGRs too)
- badly calibrated temperature and pressure sensors, or dirty MAF, causing ECU to miscalculate fuelling
- worn injectors.
Just theorising for fun, here!
2014 Nav D40 V6
The plural of anecdotes is not data. Anecdotes however, are better than hearsay
Last edited by freemansteve; 30-05-19 at 09:32 AM.