I checked the injector smooth idle comparisons:
Inj 1: -2.00
Inj 2: -3.00
Inj 3: -0.5
inj 4: 1.00
Spec is -2.8 to 2.8. Does this mean injector 2 is faulty?
The wierd thing is, even when the juddering is not happening, inj 2 is still showing -3.00 and the juddering will only happen after 10 mins of running/idleing/driving (car gets warmer). Its fine when cold and in reverse or drive in DSG box.
Car drives great, no lack of power etc
I have called Audi and they state no injector recall/campaign is due on my car!
Had flywheel replaced recently.
****** car.
Those figures are smooth running or cylinder balance adaptions. The ECU monitors Crank shaft speed via the crank angle sensor. If it see's any variation in crank shaft speed through its cycle of all 4 cylinders firing (720 degrees/2 rotations) it will identify which cylinders are working harder and which are lazy. The ECU will then trim the fuel delivery to each cylinder to equalize them and smooth the rotation of the crank. The figures you have are the amount of trim neded to get the crankshaft rotating at a smooth speed. The figure are relative to each other but give no indication of require fuel. So in theory you could have 4 equally faulty injectors showing the same figures.
There are many other variables that will affect those figures, A low compression on one cylinder will cause a lazy cylinder and therfore the ECU will compensate by adding extra fuel which will be reflected in those figure.
A poor injector washer allowing air into the diesel rail in the head can sometimes cause a problem localised to one cylinder which will also have the same result.
EGR flutter can effect cylinders differently, the ECU will try and smooth this by trimming each injector and therfore getting poor cylinder ballance figures.
So, to answer the question, No, it doesn't mean that injector 2 is faulty, It means theres an excessive variation accross the cylinders. It could very well be the injector, it could also be lots of other things.
When the car has run at idle for a while and EGR has switched off (also need to check its sealing correctly) do they settle down. Are the compressions good and equal, is the fuel supply good and air free (MVB 23 can be a good indication of fuel supply) is cam/crank sync correct (MVB 04) Cam and follower condition OK, Initial setting of injectors OK, Check for injector washers allowing combustion gas into fuel rail (Clear pipe in return and look for bubbles is a good indication), partial blockage of manifold due to excessive EGR etc etc.
Hope this helps.
Steve.