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I have a similar issue with my 06 2.0tdi DSG, when it up shifts 2-3 and 3-4 there is slight judder just before the shift happens, usually at between 3800 and 4000 rpm, if I understand these posts it seems to be fixed by oil and filter change as well as dual mass flywheel? How much is this?

No problems Mike, the diesel engine uses a different thermodynamic cycle to a spark ignited engine and there are some fundamental differences. Work (and torque) is produced during a much larger portion of the engines rotation than SI and so power can be achieved at lower speeds compared to...

Thanks for your response and generous offer, my car is currently being diagnosed by a bosch dealer but I think tandem pump is less likely to be the culprit. It's interesting to read all the engine issues on this forum and the struggle people have in finding out the root cause of issues using...

Mike, I was just having some fun based upon your previous comment, I actually work in diesel engine development (not for Audi though) and can explain exactly why the diesel engine works as it does, thanks for contributing, I'll let you know how my issue turns out

As I said I'm not changing gear, it's an auto box and the shift points are predetermined, flat spot was a bad choice of words, it's a misfire or judder. Mike, thanks for pointing out that diesel engines produce power and torque at much lower rpms, now see if you can explain why ;-) , I'll grade...

I have had bad experiences with main dealers also. I also find them a bit arrogant which is particularly frustrating as an I'm an engineer who works for a diesel engine manufacturer and can quickly tell when they don't know their stuff. Good luck with your problem, it sounds very stressful and...

The gear change happens after 4K rpm when in sport mode (it's a DSG) and sometimes when you kick down in standard auto mode. I'm going to take it to a Bosch dealer for diagnosis, carwoods are recommended, because I think the main dealers are expensive and often not great. The trader I bought it...

What made you change the tandem pump? What symptoms or poor performance did you have? Was it an easy job?

I'll do that this weekend, out of interest is it worth asking Audi whether my car has the bad injectors fitted?

Interesting thread, I have an issue with my 2006 A3 2.0tdi 140 where it judders at around 4000 rpm under full throttle. From what I've read it could be loss of fuel pressure? Can someone confirm the different elements of the fuel system, in tank pump I presume is a low pressure fuel transfer...

Thanks fuel filter would be an easy fix, wouldn't this cause issues throughout the rev range though and not just high rpm?

I've just got a 2006 A3 S-Line DSG and think the car is great but have noticed there is a hesitation or flat spot when accelerating. It happens at around 4000 rpm and feels like the engine is not getting sufficient fuel, engine does continue to accelerate to the shift point still however. Any...