Hello to all.

I've a golf mk7 gtd, engine EA288 2.0 tdi 184 "CUNA".

I have some issues in the car and VW can't solve my problem.

I found that in cylinder 3 primary injecton is advanced 12º in idlle.

In movement, just in deceleration, the variation is between -12º to -18º.

In the other cylinders is remais 0º.

With the help of vag-com 15.7 i found that in the module "engine":
location 122, the cylinder head position controller main combustion 3 bank 1 is "0"; in the other 3 cylinders is "16";
location 140, the cylinder head press sensor 3 bank 1 primary combustion position is "-12º"; in the other cylinders is "0";
location 141, the cylinder head press sensor 3 bank 1 prymary combustion Std variation is "0,24º"; in the other cylindres is "0";
location 149, the cylinder 3 bank 1 primary combustion position is "-12º"; in the other cylindres is "0º";
location 160, the cylinder head press sensor 3 bank 1 is "6.8 us"; in the other cylindres is "0 us";
I don't have a single DTC or error.

The car runs fine.

The only thing i note is that in deceleration, for example in 4th gear, i acelerate to 2000 rpm, i take the foot from the acelerator, when rotation starts to decrease, between 1800 rmp and 1200 rpm, i hear the engine knocking; It does the same in the other gears, but the best to hear is the 4th gear with the window open.

I can realy hear the car (toc, toc, toc, toc.....toc); if i acelerate during the process, the knocking noise stops imediatly.

VW changed the 4 injectors and the ECU has been changed too.
The car stills the same.

What can be the cause?

Thank you all and sorry for my english (bad english)