Transmission "Kick Jerk or Slip"

NYF32DRIVER · 08-08-2016, 06:08 PM

Difficult to describe.
Sometimes when i am driving at a very low speed and take my foot off the gas, the car jerks... it feels as though someone has tapped my rear bumper, its that severe.
Any idea what I am trying to describe ?
Thanks,
Joseph

goj · 08-08-2016, 06:12 PM

Downshifting transmission

radm · 08-08-2016, 06:26 PM

Transmission downshifting to the first gear. Actually, it is my pet peeve with automatic transmissions. How do you smoothly come to a complete stop?

goj · 08-08-2016, 06:33 PM

Quote:

Originally Posted by radm

Transmission downshifting to the first gear. Actually, it is my pet peeve with automatic transmissions. How do you smoothly come to a complete stop?

I guess put it all the way down in Eco pro. On the bright side, engine breaking can make your brakes last longer

Dan203 · 08-08-2016, 07:06 PM

At least I know for sure it's not just me...

http://f30.bimmerpost.com/forums/sho....php?t=1292276

chiefneil · 08-08-2016, 08:14 PM

Quote:

Originally Posted by radm

Transmission downshifting to the first gear. Actually, it is my pet peeve with automatic transmissions. How do you smoothly come to a complete stop?

It's only the F30, not all autos. Not a problem in our E70 X5 with the same engine and transmission. Also wasn't a problem in my E46 or our previous E53 X5. It's just an odd programming choice for comfort mode.

Eco-pro mode helps a little bit. When I'm in heavy stop and go traffic I switch to it to reduce the head-jerking effect.

radm · 08-08-2016, 08:47 PM

Thanks, I see the reason behind that. I have manual anyway, I was just wondering since I felt it every time I had a loaner.

As for engine braking, I do it more when exiting highway by shifting to 4-th and then 3-rd. Approaching a stop light I shift to 3-rd but not not always.

casualDIYer · 08-09-2016, 10:44 AM

Quote:

Originally Posted by NYF32DRIVER

Difficult to describe.
Sometimes when i am driving at a very low speed and take my foot off the gas, the car jerks... it feels as though someone has tapped my rear bumper, its that severe.
Any idea what I am trying to describe ?
Thanks,

I've felt it as well. My understanding was it was the car shifting up because of its speed but just as it makes the shift up it discovers it's going too slow then shifts right back down again, a mistake a computer would make but not a human

Billfitz · 08-09-2016, 11:18 AM

Quote:

Originally Posted by radm

How do you smoothly come to a complete stop?

Mine does, every time, in either comfort or eco pro modes. I don't run in sport unless I anticipate needing to pass, so I can't say if it's not smooth coming to a stop in sport.

HighlandPete · 08-09-2016, 03:54 PM

Quote:

Originally Posted by radm

Transmission downshifting to the first gear. Actually, it is my pet peeve with automatic transmissions. How do you smoothly come to a complete stop?

Not the behavior of my 535i with the 8-speed auto. Comes to a stop without any down changing jerk.

Never had a problem with smooth stops with my long term BMW autos with 5, 6 or 8-speed ZF autos.

HotTea69 · 08-09-2016, 06:17 PM

Realized my car behaved the same way, but I rarely drive aggressively and I have a rather light foot. I believe my car ECU has learned my driving habits and I no longer feel the jerk nor drag. Or maybe I've gotten used to it.

08-08-2016, 06:08 PM	#1
NYF32DRIVER Lieutenant 132 Rep 556 Posts Drives: 2016 428i X Drive Join Date: Feb 2006 Location: Long Island, NY, USA iTrader: (0)	Transmission "Kick Jerk or Slip" Difficult to describe. Sometimes when i am driving at a very low speed and take my foot off the gas, the car jerks... it feels as though someone has tapped my rear bumper, its that severe. Any idea what I am trying to describe ? Thanks, Joseph __________________ 2016 428i X Drive. Mineral Gray Metallic. Born 2/2016, Munich Factory. Member BMW CCA Since 2008
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08-08-2016, 06:12 PM	#2
goj Brigadier General 2253 Rep 3,622 Posts Drives: 2016 EBII 340i 6-MT Join Date: Aug 2015 Location: Bay Area, CA iTrader: (0)	Downshifting transmission __________________ BMW CCA Member #516012 2016 340i, Estoril Blue, Manual Transmission, MPE, MPBBK, HRE FF04 Instagram: @brandons340i
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08-08-2016, 06:26 PM	#3
radm Private First Class 132 Rep 109 Posts Drives: M3 6MT ordered, AR 4C Spider Join Date: Sep 2015 Location: San Francisco Bay Area iTrader: (0)	Transmission downshifting to the first gear. Actually, it is my pet peeve with automatic transmissions. How do you smoothly come to a complete stop?
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08-08-2016, 07:06 PM	#5
Dan203 Lieutenant Colonel 136 Rep 1,592 Posts Drives: 2016 340i xDrive Join Date: Jul 2008 Location: Carson City, NV iTrader: (1)	At least I know for sure it's not just me... http://f30.bimmerpost.com/forums/sho....php?t=1292276
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08-08-2016, 08:47 PM	#7
radm Private First Class 132 Rep 109 Posts Drives: M3 6MT ordered, AR 4C Spider Join Date: Sep 2015 Location: San Francisco Bay Area iTrader: (0)	Thanks, I see the reason behind that. I have manual anyway, I was just wondering since I felt it every time I had a loaner. As for engine braking, I do it more when exiting highway by shifting to 4-th and then 3-rd. Approaching a stop light I shift to 3-rd but not not always.
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08-09-2016, 06:17 PM	#11
HotTea69 First Lieutenant 137 Rep 310 Posts Drives: 2014 F32 AW M-Sport Join Date: Jul 2016 Location: Queens, NYC iTrader: (0)	Realized my car behaved the same way, but I rarely drive aggressively and I have a rather light foot. I believe my car ECU has learned my driving habits and I no longer feel the jerk nor drag. Or maybe I've gotten used to it.
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