"The Lurch" does any of the tranny updates fix it?

[rayxi]

More info from Audi world.

ZF Presents the First 6-speed Automatic Transmission

I've underlined the interesting bits that may be related to the slamming issue.

Torque converter with novel actuation
In automatic transmissions the torque converter is mainly used to move off the line. Part of the new electronic control system for the transmission is the Stand-by Control /SBC. Instead of having the converter running against the engine with the vehicle standing still (foot on the brake pedal), as was previously the case, the converter is now disconnected from the powertrain so that there is only minimal residual load. This further reduces fuel consumption.

I suspect that it's this disconnecting/reconnecting of the torque converter that's causing the slam from a rolling stop. Not quite the "novel actuation" I want in my X5. This is the suspected modus operandi. See below for the suspected root cause.

Transmission control
The electronic transmission control system is based on the newly developed Adaptive ShIft Strategy /ASIS.

The electronic system is constantly fed with data on the condition of the transmission, operating condition, operator behavior and operator requests. Comprehensive evaluation of these sensor signals permits complex functional structures of the control system. As a result it can react to spontaneous driver action or sudden topographical changes and immediately transmit the optimized shifting points to the attached hydraulic shift unit. In this process, the control system covers innumerable variations of driving style, from very sporty to very economical, derived from the incoming signals.

Practically unnoticed by the driver, the electronic system also adjusts its drive strategies to special conditions, such a city traffic and different load conditions.

I've seen reports of issues with the sensors feeding the control system ranging from faulty sensors to whacky signals due to low voltage. The low voltage theory is interesting in that it may explain why some owners experience it and not others and why it seems to get better or worse. It may depend on the condition of the battery, alternator and/or electrical load at the time. I'm going to check my battery when I get home tonight and put it on the charger. I'll see if it has any affect on the symptoms.

[laughingboy]

Have you tried this?

Originally Posted by NOVAX5
Use 30 secs reset method. It will solve the problem.
-Turn key to position 2. But dont start the engine.
-Floor the gas pedal for 30-40 secs.
-Release the gas pedal, step on brake and start the engine.
-Drive FORWARD (Not reverse, so make sure you are out of your garage before you attempt to do the transmission reset)

Do this every other month or when the transmission start slamming again.

http://www.xoutpost.com/bmw-sav-foru...nshifts-3.html

[rayxi]

I heard that the above procedure resets the throttle adaptation not the transmission adaptation. Can someone please confirm one way or the other?

[MADT]

People claim it makes a difference somehow and somewhere but it doesn't reset the transmissions adaptations.

But I will try it again today and report back

[roadfrog]

You think our X5's are bad, you should ride in my Acura! Accelerating from a rolling stop produces a crazy slam. Almost like that of a broken engine mount. My X5 does it occasionally, but not nearly as bad or as often as the Acura.

[bigwave2255]

for me it seems to be a driving style thing, i have an 05 3.0d and if i come to a sharp stop, as in peak hour traffic it will intermittently slam, from what i have experienced it seems as though the trans is hanging onto 2nd gear, thinking that the car is going to want to speed back up, once it realises its stopped then it selects 1st gear with the accompanying hard down shift, what i do is either slip it into neutral just as i roll to a halt or alternatively put the stick in sports mode, but this can be a pain in stop start motoring as it hangs on to each gear to long

as i said for me its a driving style thing,

Ewen

[sunny5280]

Originally Posted by bigwave2255

for me it seems to be a driving style thing, i have an 05 3.0d and if i come to a sharp stop, as in peak hour traffic it will intermittently slam, from what i have experienced it seems as though the trans is hanging onto 2nd gear, thinking that the car is going to want to speed back up, once it realises its stopped then it selects 1st gear with the accompanying hard down shift, what i do is either slip it into neutral just as i roll to a halt or alternatively put the stick in sports mode, but this can be a pain in stop start motoring as it hangs on to each gear to long

as i said for me its a driving style thing,

I think it's more than a driving style. As I stated earlier I drove my X5 without any changes to my driving style and it started to exhibit this behavior after six months. IMO there's an underlying issue which driving style can minimize. But, IMO, it's a bandaid and not a cure.

[MADT]

Having the latest software update done in a week so I will report back

[xRide]

could this problem simple be a auto tranny thing?

[Driven]

Stopped into my local dealer and talked with my service tech. I am experiencing the slight bump when the transmission shifts from 2-1 upon stopping (I can control it if I ease off the brake just before the car comes to a complete stop). I would like to have the updated software program, but...

Dealer wants $180 to reprogram...Is it worth it? Would an Indy be able to perform the same job at a fraction of the cost BMW wants?

Driven