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      11-21-2010, 12:23 PM   #1
Bigman30685
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Downshift issue?? or normal??

I notice this at time when I'm slowing down, coming to a stop.

I'm in D at this point....

At slower speeds coming to a stop I notice that either the car shifts really hard causing a jerk or the breaks loosen all of a sudden causing it to jerk. It happens between 1-5 mph, other than that there is no issue with accelerating or deaccelerating.

um...odd? or normal? thanks.
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      11-21-2010, 12:42 PM   #2
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my car does jerk a little when slowing down but not really annoying me
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      11-21-2010, 12:51 PM   #3
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maybe I just need to change my braking style? I come from owning a pickup truck lol.

This is just a leeeeeetle different lol
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      11-21-2010, 12:57 PM   #4
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Mine does that in DS mode. When the RPM jumps, my car jerks. D is very smooth.

http://s56.photobucket.com/albums/g1...t=MVI_3396.mp4
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      11-21-2010, 01:06 PM   #5
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I'll make a quick vid today to see if it actually shows a abrupt change in rpms
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      11-21-2010, 01:15 PM   #6
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i think its normal
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      11-21-2010, 01:17 PM   #7
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i do notice that my car's brakes are "sticky" when parallel parking. I let off the brakes and there is a full 1 second delay. not all the time, but it is a usual occurrence.
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      11-21-2010, 01:33 PM   #8
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What you're describing sounds more like DS behavior, when the car will downshift to 1st before coming to a complete stop. In D, it starts from 2nd.
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      11-21-2010, 06:14 PM   #9
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It could be that...i have no idea since I can't see the M screen in D mode.

I'll see if there is a change in RPM when it jerks.
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      11-21-2010, 06:21 PM   #10
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It shouldn't do that coming to a stop not matter what mode you're in. Only time you would get a sudden jerk coming to a stop is if you were in manual mode and you downshifted prematurely. You should take it in for service. If it happens often it's easy to show the tech's.
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      11-21-2010, 06:26 PM   #11
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Mine does it also. Been to the dealer 3 times, they cannot find anything but it is annoying as hell. The car does exactly what you describe, sudden lurch when just about to stop. I took the technician for a ride last week and could not recreate it. Seems like it does it more when cold??? But it can reoccur at any time. This cannot be right I have 4 other BMW's and never had this issue. I will figure it out and when I do I will let you all know.
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      11-21-2010, 06:35 PM   #12
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I find that resetting the transmission does help a little bit. I get those lurching when I am about to stop...especially when Im going on an incline. I have the GM transmission and I am sure its worse than the 335s with the ZF.
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      11-21-2010, 09:27 PM   #13
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Went for a drive, its easily replicated lol. But as far as I can see, no is no change in RPMs at all...braking issue?

Since I'm now on the CPO warranty, how does that work at a BMW service center? Same as standard warranty?
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      11-21-2010, 09:40 PM   #14
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mine does it too - in D. Annoying.
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      01-05-2012, 09:13 PM   #15
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any fix for this?
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      01-05-2012, 09:41 PM   #16
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normal. I think it is the brake assist that kicks in. something like that
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      03-05-2012, 06:08 AM   #17
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Not the brakes

Mine does the same thing. It is NOT the brakes system. I have reset the adaptive values for the transmission multiple times! The car drives (and stops) like a dream for a little bit afterwards but the bump always seems to come back. I would venture a guess and say it is a software defect...because the problem goes away when the adaptive values are reset...but then constantly returns. I am still looking for a permanent solution...

Quote:
Originally Posted by josh06lau View Post
normal. I think it is the brake assist that kicks in. something like that
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      03-05-2012, 07:25 AM   #18
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I've noticed this in D mode, doesn't do it in DS mode. Usually always happens when I don't fully stop and give it more than 25% throttle to accelerate again from 1-3mph. It's as if it's being slammed into gear. If you are very light on the throttle or in DS mode it doesn't happen. I just thought it was normal, and since this many folks exerience the same thing its starting to sound like it (or a software defect like zigsman pointed out).

edit- reread the original post and for me I don't get any thud or jerk when coming to a stop, only when accelerating from a 1-3mph roll

Last edited by PiZauL; 03-05-2012 at 07:38 AM.
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      04-11-2012, 07:40 AM   #19
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Quote:
Originally Posted by PiZauL View Post
I've noticed this in D mode, doesn't do it in DS mode. Usually always happens when I don't fully stop and give it more than 25% throttle to accelerate again from 1-3mph. It's as if it's being slammed into gear. If you are very light on the throttle or in DS mode it doesn't happen. I just thought it was normal, and since this many folks exerience the same thing its starting to sound like it (or a software defect like zigsman pointed out).

edit- reread the original post and for me I don't get any thud or jerk when coming to a stop, only when accelerating from a 1-3mph roll
I replaced the transmission mechatronics sleeve, seal adapter, changed the fluid and reset the adaptive values all at the same time a few weeks ago. Since then, I have only put a couple hundred miles on my car, but it seems to have fixed the problem. Before I did this, the hard shift issue would re-surface after approximately 20-50 miles. So far, so good. Price wise, it was only a couple of hundred dollars, and the VAST majority of that was in the new transmission pan/filter and oil. The mechatronics sleeve and seal adapter were less than $20 combined, so if you re-use your oil and pan, you can fix this yourself for about $20.


UPDATE:

First off, this problem is NOT NORMAL, it is a defective solenoid in the mechatronics. I found after driving for a couple of months the "bump" came back so I replaced all of the solenoids in the mechatronics. The job is fairly simple and the parts cost $455 (on sale right now) so if you feel inclined, see my other post on this topic:

http://www.e90post.com/forums/showth...hlight=zigsman

Mike

Last edited by zigsman; 12-05-2012 at 04:39 PM.
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