E91 330d auto box fault(?)..is it me??

[breadvan]

Merry Xmas all.

As mentioned I have an E91 LCI 330d M Sport auto. Awesome car, but I'm sure the there's an inherent gearbox problem.

It feel like the 'clutch' is slipping when I pull away, especially when cold as the revs rise massively and it seems to take ages before the engine speed matches the road speed (if you know what I mean?). My last car (an E61 530d M Sport) did it also, but the previous 2 330d's (E90 and E92) didn't do it.

It may be something to do with efficient dynamics (??), but it drives me crazy as you're over-revving all the time when accelerating. Its definately getting worse as the mileage rises.

I've taken it to my dealer, who can't fault it.

Any suggestions??

[roofer]

Had this occasionally in mine (335d) Only if i start and try to pull away straight away from cold. Seems as if the pump is re pressurising the box for a couple of seconds, worse if left a couple of days. Maybe a dirty panel filter, or needs a fluid change, i will drop the sump when it warms up a bit.

[rassi]

Does it do it in Sport setting too? IIRC the box will set off in 2nd by default, hence some "slipping" to get off the mark, whereas Sport should use 1st.

[john_p]

Does it hold the revs at a certain point and continue to accelerate ? I think my E46 steptronic does that, something about hold it at peak torque and using the gearbox to control the speed - more efficient that way.

Maybe different behaviour between software versions, comparing to previous cars.

[Neil.D]

My 535d does this, but only on occasion. It doesn't in manual - the torque converter is locked, but in D it will do as you describe.
It seems to do it more when pulling away uphill. I've always thought, owing to the circumstances of this that it tries to smooth out such situations.
I'd like to know when the ECU locks up the torque converter and under what situations