Hi guys! I'm having an issues with my 2.0 TDI. I've posted before, and working for a solution, so thanks for sticking by me if you read mypast post. But a very interesting development... Basically, I'm getting a rough idle and lots of smoke when COLD (100% fine when warmed up). Now, the interesting bit... Having run some tests on this I'm finding that the car is 100% FINE for the first approximately 60 seconds or thereabouts. THEN the rough idle and smoking begins. When you first fire it up super-smooth, no issues. Wait around 60 seconds, engine shuddering on the idle, and lots of smoke. No overheating issues, no 'cheese' on the oil cap, pretty sure it's not a head gasket issue. In the past on a petrol I have leaking valve rings, but that would smoke immediately upon start up. This does not. If it were injectors it would again do it straight away, not suddenly after 60 seconds. I thought maybe EGR valve as I believe that is not open when engine first started, but kicks in soon after? I removed the EGR valve and intake manifold, and cleaned both (not too dirty to be fair), tested EGR valve with VAG COM. All good. So, what kicks in at around 60 seconds AFTER starting the engine that is not active when you first start it? Here are the video's of my symptoms AFTER the 60 seconds approx: Thanks guys! P.S. I actually have an A6 2.0 TDI rather than A4. I have also posted this on the A6 forum, but that forum seems very quiet so hoping for more luck here. As the A4 uses the same engine should be the same across both platforms. Please do not move this post. Thank you.