I have recently bought a 54 plate A3 2.0l Sport TDi (110K miles) and i am a bit concerned that there may be a problem on the engine/turbo side of things. As this is my first turbo diesel I am willing to concede that the problems may well be related to my driving style which may need to change to match the car.
The apparent symptoms may well point to the same thing.
When driving slow, in a car park for instance, the power is very lumpy, with the car lurching randomly through little or no change in foot pressure on the accelerator ( I find I am riding the clutch in first or second gear to compensate)
Having said this, the car displays almost gutless acceleration if considerable revs are not being achieved by the engine (I will have to keep an eye on the rev counter to get an idea of how many revs are required to give me half a chance at pulling out of a busy junction with any chance of survival!!) Unfortunately, once the car is on the move the unexpected lack of power is very slow to revive but does so rapidly once the turbo kicks in.
The drive is also quite lumpy when cruising at 50-60mph with the car seeming unhappy to relax in higher gear (5th and 6th).
There is another issue at first start up which is almost definitely completely unrelated, whereby one of the cylinders seems to be having a bit of a hard time getting going when cold. The first second or so of the engine running is slow and dull (possibly on 3 cylinders) but once up and running all is well. I suspect a heater plug as once full engine power is established there is a fair sized puff of whitey grey smoke from the exhaust which clears up straight away.
The plan is to get the car into Audi for a service and a once over to see what they come up with. In the mean time I would be interested to hear if any of these symptoms relate to anything that anybody else has experienced and the likeliehood that my wallet may be about to be exposed to rapid weight loss!!
Cheers for any thoughts,