I brought a 170tdi (BRD i think) a few weeks ago and found it has got a problem with the turbo. When pulling away from junctions the car will accelerate to around 2500rpm and then plod along for a few seconds before the turbo kicks and then carry on accelerating. When it does this it puts out a lot of smoke.
There are no fault codes and the garage I brought it from had a look but couldn't find the fault.
Any help would be great thank you.