Thinking of deleting EGR. But with a hole in the blanking plate to keep EML off. Pros and cons from G owners please...
I'll take out my MAP sensor tomorrow at noon and take a picture of it. I have a working EGR and about 55k miles on the engine.EGRs are great new, shall I re-phrase that?! EGRs are great for NOX emissions when new.
As mentioned, they make the MPG worse, they also increase particulate emissions, increasing the need for DPFs.
Longer term I would contest they are bad for the environment.
Remember they effectively work by putting the exhaust (very hot and sooty air) into the engine manifold.
Take out your MAP sensor, its along the back of the manifold at the back (see the image below). Without an EGR (or with it blanked) it would have a thin film of oil on it. Instead you have a thick sludge/ deposits. This coats EVERYTHING in the manifold, from the butterfly valve (restricting air into the manifold), the manifold, the inlets to the engine valves, the valves, and swirl flaps where fitted (which often leads to them failing).
All this means is that after 20-30k, the engine will start suffering and performance (both the 'fun' part and the environmental part) will start degrading.
Remember DPFs have a finite life, the more they clog up the shorter this will be, EGRs increase the clogging, especially when the manifold clogs up).
The good news?! The 2.0jtdm has an improved EGR with a cooler built in (so it's more just sooty air going in). The older 1.9 and 2.4JTDM were notorious for EGR failures! However there is still some associated turbo lag.
file_zps9b01ebe0.jpg Photo by xrturbopilot | Photobucket