Hesitation issues.

[x5mad]

Had the same problem on my 08 3.0 si. Reported it to the dealer and had it booked in for that and other issues.

The delaer reported no fault (surprise, surprise) and just reset the learning module.

I must say though, since then I have not experienced the lag!

My theory is that when your car is new most people tend to 'baby' their car and are very gentle on the throttle (running in the engine). Hence the car thinks its your granny driving it. Since the reset I have not had to pay attention to the running in process and give the gas a bit of welly. Therefore the transmission is now learning my usual driving habits.

Does this make any sense? But since the reset, have noticed huge improvement.

[y5choi]

well, makes intuitive sense. But as per the BMW technical manual (there's a link to it here on the forum somewhere) the transmission shifting profile is not saved or stored long-term in the car; it's programmed to respond to the driver's input each and every time the car is being driven separately. So I'm not sure what the issue can be but my 4.8i got the reset again but it still shifts roughly when coming to a slow steady stop.

ie- coming to a red light, I brake smoothly and the car just before it comes to a complete stop, it downshifts and all our heads jerk forward- as if i stepped on the brake like a panicky 5 year old.

[2007BlkX5]

i just use the steptronic to do shifting and it's not a problem.. so maybe it has more to do with gear selection as some people pointed out rather than drive by wire and delay

[bmwman3241]

I have a 09 X5 4.8 with about 10k km on it. I feel the lag a lot. I will push the accelerator down, and the car will hang there and then finally throw me back. When going slow, the car jerks a lot as well. It is the same in DS, although it is a little faster and louder. I see myself switching many times between D and DS during my drive.

BTW, is the DS supposed to stop faster? When I am driving slow in traffic and take my foot of the brake to let the car roll, it seems to stay steady until I push the accelerator. Then when I take my foot of both, the car starts noticeably slowing down on its own (As if the break is being pushed) unlike the normal D.

[evolver]

Originally Posted by y5choi

coming to a red light, I brake smoothly and the car just before it comes to a complete stop, it downshifts and all our heads jerk forward- as if i stepped on the brake like a panicky 5 year old.

I have the same problem with my 08 4.8i. When slowing down to a red light, it downshifts sending a jerk to otherwise smooth ride.

I experience a lag when starting to move. Just like somebody else described above. I push the pedal, no reaction. I push harder, still no perceivable or anticipated motion. I push a little harder and it lurches forward as if I dropped the clutch on a manual gearbox.

Hope this can be cured with transmission firmware reflash (if there is any).

[jamesboags]

There's an option to reset the tranny computer isn't there I did it once .. to set it back to "unlearnt' Mode ?

[jamesboags]

From the E60 forums.. worth a try I did it once...

You put your key in/hit start ONCE so the electronics of the car come on but it is not started.

Then hold down the gas, past the downshift point to the floor for 25-30 seconds straight.

If you listen, at about 25s exactly you will hear some "noise" and that is the tranny "resetting" itself to factory specs

[peterjaw]

Originally Posted by jamesboags

From the E60 forums.. worth a try I did it once...

You put your key in/hit start ONCE so the electronics of the car come on but it is not started.

Then hold down the gas, past the downshift point to the floor for 25-30 seconds straight.

If you listen, at about 25s exactly you will hear some "noise" and that is the tranny "resetting" itself to factory specs

Wow! Never though it would be so easy. I will give it a try later when I
leave the parking lot from my office.

Thanks, James.

[pureflames]

Originally Posted by jamesboags

From the E60 forums.. worth a try I did it once...

You put your key in/hit start ONCE so the electronics of the car come on but it is not started.

Then hold down the gas, past the downshift point to the floor for 25-30 seconds straight.

If you listen, at about 25s exactly you will hear some "noise" and that is the tranny "resetting" itself to factory specs

I tried this on the wknd but I did not hear a click. Perhaps only for the E60??

[peterjaw]

Originally Posted by pureflames

I tried this on the wknd but I did not hear a click. Perhaps only for the E60??

Yeah, I tried yesterday and did not hear anything. Maybe my ears have some problem?

I am not sure if the tranny has been reset or not.

But, still thank you for sharing.