GetBMWParts
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read

Go Back   BMW M3 and BMW M4 Forum > BMW F80 M3 / F82 M4 Forum > BMW M3 (F80) and BMW M4 (F82) General Forum

Post Reply
 
Thread Tools Search this Thread
      09-21-2021, 12:52 AM   #1
BruceT
New Member
5
Rep
10
Posts

Drives: Bmw 435i M Performance
Join Date: Jan 2021
Location: Johannesburg

iTrader: (0)

2016 M4 DCT - Gearbox issue?

Hi All,

This morning on the way to work while sitting at a red traffic light i had a massive bump or knock. I actually thought someone had driven into the back of me.
I put the car into neutral/park and checked the rear bumper. No one had driven into me.

Got back in, selected drive and pulled away like normal with no noises or power loss.

Any idea what it could be and what I need to do about it.

It is totally standard so no mods to tuning or gearbox.

Thank you
Appreciate 0
      09-22-2021, 02:16 AM   #2
BruceT
New Member
5
Rep
10
Posts

Drives: Bmw 435i M Performance
Join Date: Jan 2021
Location: Johannesburg

iTrader: (0)

2nd day driving and no issues with gear changing in any setting or any noises.

Really wierd.
Appreciate 0
      09-22-2021, 03:00 AM   #3
HarryTee
Lieutenant
HarryTee's Avatar
United Kingdom
214
Rep
497
Posts

Drives: 2020 M4CP & 2017 440i GC
Join Date: Jan 2020
Location: UK

iTrader: (0)

Quote:
Originally Posted by BruceT View Post
Hi All,
I put the car into neutral/park and checked the rear bumper. No one had driven into me.
Good news there!
Appreciate 0
      09-22-2021, 05:24 PM   #4
Imperial328i
Lieutenant
Imperial328i's Avatar
United_States
277
Rep
558
Posts

Drives: 2015 MGM 328i, 2017 LBB M2
Join Date: Jan 2018
Location: Southern Maryland

iTrader: (1)

I think sometimes the DCT just spazzes out for no reason. My 2017 F80 ZCP does a violent, clunk-inducing downshift from 3 to 2 sometimes, but only when the air conditioner is on and I'm in D1. I was freaking out at first, but it behaves fine otherwise.
__________________
2017 F80 ZCP - Mineral Grey Metallic
Appreciate 0
      09-22-2021, 05:31 PM   #5
M5D
Second Lieutenant
M5D's Avatar
301
Rep
279
Posts

Drives: 2016M4
Join Date: Jul 2012
Location: PNW

iTrader: (0)

Quote:
Originally Posted by BruceT View Post
Hi All,

This morning on the way to work while sitting at a red traffic light i had a massive bump or knock. I actually thought someone had driven into the back of me.
I put the car into neutral/park and checked the rear bumper. No one had driven into me.

Got back in, selected drive and pulled away like normal with no noises or power loss.

Any idea what it could be and what I need to do about it.

It is totally standard so no mods to tuning or gearbox.

Thank you
When was the fluid changed out?
Appreciate 0
      09-22-2021, 05:32 PM   #6
fiveohwblow
Major
fiveohwblow's Avatar
United_States
3633
Rep
1,397
Posts

Drives: F15, E46 & M3, F82
Join Date: May 2016
Location: Desert SW

iTrader: (0)

Had this happen to me, almost to an exactness, but with my E46. What was explained to me was that in the event of a quicker than normal stop, the worn u joints or center support bearing allow for driveline bind and eventually that bind gets unbound…

Did you happen to make a quick stop? If not, ignore
Appreciate 0
      09-23-2021, 06:54 AM   #7
maddmatth
Major
New Zealand
555
Rep
922
Posts

Drives: F82 M4, E92 335i
Join Date: Jun 2015
Location: New Zealand

iTrader: (0)

Was the oil still cold? The DCT can make some clunks when cold, specialty when the weather is cold.
It may have been doing the 2->1 shift. In stop-start traffic it'll hold 2nd, but if you stay stopped for a couple seconds it'll drop to 1.

I see you're in Johannesburg. Brave of you to get out in traffic (South African here)
Appreciate 0
      09-23-2021, 08:08 AM   #8
1stockf80
Private First Class
92
Rep
126
Posts

Drives: 2017 f80
Join Date: Apr 2020
Location: commack ny

iTrader: (0)

Dct does that from time to time. Never had it at a complete stop like you experienced but on downshifting/up shifts, the jolt is serious.
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 04:21 AM.




f80post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST