Davidjay85

This is my EGR valve. Does anyone know if its normally slightly open like this? Or is mine broken?

Hi Guys, Just joined the forum, I have a slight issue with my car and hoping to get a bit of advice on what to do next. I have a 2005 Audi A4 S-Line 2.0 TDI 140 which I have owned since August last year. The car drove brilliantly at that point. The Problem A couple of months ago, the car started to hesitate slightly on acceleration before the boost kicked in followed by black smoke coming out of the exhaust when it did pull away. The problem has been getting worse and the car has now gone into limp mode (I think). EML on the dash and its not boosting, not revving past 3k rpm although it will boost at random sometimes and go back to normal for about 10 seconds. Then back to limp mode. I'm avoiding driving at the moment as I don't want to make it worse. Diagnosis I had the codes read and had: P0234 - Turbo Overboost condition P0101 - Mass air flow performance problem P0404 - EGR valve performance problem Following this I decided to remove the EGR Valve and throttle body and clean them up, refitting them with new gaskets. I also cleared the codes and EML and took it for a drive. Same problem still in Limp Mode.One thing I did notice is when the EGR valve was off the car is that the flap does not appear to be fully closed. Is this normal? I have a photo I can upload of this. Can anyone advise on what to do next before I take it to a garage? Is it worth changing the MAF? Could the turbo be at fault? Should I replace the EGR valve with a new one? Could it be something else all together that causing this issue? One thing thats in the back of mind is that several months ago I accidentally put a bit of petrol in. No more than £10 worth of Petrol, then filled it up with lots of diesel afterwards £60 or so. I have been told that this could not cause the issues i'm having but I'm not so sure... Any advice will be very much appreciated. I cant really afford to give it to a garage as I know it will cost me a bomb and I'm convinced it is probably something simple. Thanks for reading, David