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7 Series - F01 / F02 (2009 - current)
The new re-designed 7 series F01 / F02 leads off the BMW Fxx chassis code!

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  #1  
Old 06-26-2012, 08:27 PM
Slow Learner Slow Learner is offline
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harsh shifting

I recently picked up a CPO 09 750i with 30K miles. It had some hesitation from a stop at the dealer, but they dismissed it as the adaptive trans and said it would go away. Being a slow learner, I believed them. It didn't. After an 98 750 and a 00 740, I expect this thing (with a 6 speed) to shift smoother than them. Doesn't. Much worse. It lurches 1-2 and 2-3. Comes out of gear and slams back in going around a low speed corner. Dealer says "no faults" so it must be fine. I think otherwise. Anybody else got this?

Slow Learner
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  #2  
Old 06-26-2012, 11:26 PM
f01driver f01driver is offline
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Quote:
Originally Posted by Slow Learner View Post
I recently picked up a CPO 09 750i with 30K miles. It had some hesitation from a stop at the dealer, but they dismissed it as the adaptive trans and said it would go away. Being a slow learner, I believed them. It didn't. After an 98 750 and a 00 740, I expect this thing (with a 6 speed) to shift smoother than them. Doesn't. Much worse. It lurches 1-2 and 2-3. Comes out of gear and slams back in going around a low speed corner. Dealer says "no faults" so it must be fine. I think otherwise. Anybody else got this?

Slow Learner
I have a 2010 750i which I purchased a month ago and I've had the same issues but it's gradually getting better. I also noticed in the normal mode it's more noticeably but in comfort mode it's basically gone. The funny thing is I also had similar issues with my 2010 E92 335i.
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Old 06-27-2012, 02:15 AM
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beamlord beamlord is offline
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Try a tranny reset
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Old 06-27-2012, 06:47 AM
kpumroy kpumroy is offline
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Unfortunately that is a characteristic of the ZF 6 speed transmission. Search the other forums and you will see similiar complaints. The so called transmission reset procedure is an internet myth. It does not work. Adaptation is designed to account for variance in manufacturing tolerance and wear. The PR people like to say it "learns" your driving style. Another myth.
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Old 06-27-2012, 06:49 AM
Slow Learner Slow Learner is offline
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Did that, no change. Later they found a faulty fuel pressure sensor that was explained as starving the engine near the shift points and causing the lurching shifts. New sensor improved things, still very far from right.
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Old 06-27-2012, 07:00 AM
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beamlord beamlord is offline
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Originally Posted by kpumroy View Post
Unfortunately that is a characteristic of the ZF 6 speed transmission. Search the other forums and you will see similiar complaints. The so called transmission reset procedure is an internet myth. It does not work. Adaptation is designed to account for variance in manufacturing tolerance and wear. The PR people like to say it "learns" your driving style. Another myth.
I am sure you are more competent than the creator of this transmission, master mechanic at ZF Headquarters in Friedrichshafen who says that to his customers.
Please, get your facts straight before posting such rants.
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Last edited by beamlord; 06-27-2012 at 07:14 AM.
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Old 06-27-2012, 07:01 AM
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beamlord beamlord is offline
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Originally Posted by Slow Learner View Post
Did that, no change. Later they found a faulty fuel pressure sensor that was explained as starving the engine near the shift points and causing the lurching shifts. New sensor improved things, still very far from right.
Another reset after the sensor replacement?
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Old 06-27-2012, 07:05 AM
Slow Learner Slow Learner is offline
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Good point. I don't know. I'll have them try it if not done already.
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Old 06-27-2012, 07:13 AM
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beamlord beamlord is offline
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Originally Posted by Slow Learner View Post
Good point. I don't know. I'll have them try it if not done already.
It's much better if you do it yourself - they might have mechanics who think it's a "myth" like the previous poster, and just tell you "it didn't work" without even doing it properly.
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Old 06-27-2012, 07:28 AM
Slow Learner Slow Learner is offline
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Okay. Worth a try. Thanks.
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  #11  
Old 06-27-2012, 09:15 AM
kpumroy kpumroy is offline
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Not intended as a rant. In my experience the transmission reset procedure does nothing. Until someone can post documentary evidence that such a procedure exists from BMW, it is in my opinion a myth and just plain bad advice.
I do have a theory that I haven't been able to test but I suspect that ethanol blended fuel may be the culprit. I understand in Germany you can still get "real gas". Here we cannot. The only places we might find it is a marina or airport. The corporate line is that cars will perform OK on e10 but are really designed to run on high octane gasoline.
To the OP my 2009 750i does just as you describe, so did my 2006 550i. Went down that road with BMW and found it to be a dead end. If you find a solution, would love to hear about it.
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