99GunMetalTJ wrote:
I really appreciate your help on this as I've never owned a diesel. The mechanic at this dealer seems quite knowlegeable about diesels and the unique CRD. He seems to think the EGR is bad and that it is not allowing flow so I'm assuming it has failed in the closed position. From what I have read on this forum if it failed in the open position we would be getting some poor running conditions which we have not. So if it is closed how can I verify for sure and if it is closed will the SEGR mod. solve my problems? Also he mentioned the EGR cooler may be clogged but would not know unitl he removed the EGR to be able to inspect the cooler. With the SEGR mod. I assume the cooler is no longer relevant. Is this true? I'm just trying to figure this all out because I may be getting on your list for one of these SEGR's. Also how involved is the install for a pre-built SEGR. I'm pretty mechanically inclined but really have no electronics experience. One last thing with the SEGR install will I be able to unplug the ORM without getting a CEN light?
You've pretty much summed up the issue. If you are running well, most likely the EGR is closed, but you can guarantee that by installing a thin plate in place of the gasket where the exhaust plumbs into the EGR. All the SEGR is going to do for you is electrically disconnect the EGR valve from the ECM, and substitute a dummy in it's it's place so you won't get a check engine light (CEL). With the SEGR you need the MAF sensor (the "ORM") plugged in and operational. And yes, with the EGR off, the cooler is irrelevant.
That sums up what the SEGR does ... fools the ECM that the EGR is still operational so you get the benefit of no EGR and the benefit of the CEL for when something else goes wrong.