Hi guys

Hoping you can help me out a bit with this as done a lot of research online and found LOTS of people having the exact same/very similar issues with their 2.0 TDI engines across the Audi range. Mine is the A6 2.0 TDI 2008. However, in all the research I did nobody was providing a single solution. So hoping someone may recognise my symtoms...

When all warmed up seems very happy indeed.

However, from a cold start the revs can be a little juddery. You can feel a light shaking to the car. When you increase the revs it seems to 'stutter'.

I have taken a video. You may be able to make out the light shaking/juddering. Watch as revs increase:



This is accompanied by excessive smoke, which I would say is white. Check it out:



Any ideas very welcome!

Quick update on this...

Today I removed the EGR valve. Yes, dirty and some carbonin there, but nothing ridiculous. All cleaned and ready to refit.

I also connected up Vag Com which showed no issues on the auto scan. I did the live data and tested 013 injector quality quickly.

Admittedly engine was not particularly hot (especially at first).

I noted on idle injector readings fluctuated a bit, but at one stage I saw this:

-1.01 -0.05 1.22 -0.28

I'm not an expert at all on these readings, but I think from my research that up to =-1.1 in acceptable?

So injector 3 a little high there. But like I say, it fluctuated and dropped back down to normal levels, and all four seemed reasonably happy.

So then I revved up to 2,000 ropm which is where the stuttery/judder happens as per my video above. I got this readon this time, which I could repeat with similar results each time:

2.31 All others around 0.78 mark

So injector 1 standing out on it's own with a high figure running up to 2,000 rpm. I assume that can't be normal?

A friend pointed out that if it were an injector, wouldn't it play up all the time, not only when the engine was cold?

With vcds injectors can be checked in group 72-74 as well. But best way to check is on a test bench