M5POST
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read

Go Back   M5POST - BMW M5 Forum > F10 M5 Forum > Regional Forums > UK

Post Reply
 
Thread Tools Search this Thread
      05-01-2020, 08:14 AM   #1
Taheemr
Captain
United Kingdom
279
Rep
731
Posts

Drives: M6 GC
Join Date: Nov 2011
Location: Mids

iTrader: (0)

Gear engagement bump after cold start

Hello All

do any of you get a thump when engaging gear from an overnight cold start, I am getting varying degrees of an aggressive thud when either selecting reverse or 1st gear from a cold start from the P position.

at times its almost as the gearbox is going to expload its that agreesive and the car can lunge forward or backwards


Is this normal ?

Thanks
Appreciate 0
      05-01-2020, 11:56 AM   #2
Taheemr
Captain
United Kingdom
279
Rep
731
Posts

Drives: M6 GC
Join Date: Nov 2011
Location: Mids

iTrader: (0)

it does seem to be less if i let the car idle for a few seconds from cold before selecting gear, I dont like letting the car idle when cold for obvious reasons.

I did have it checked but came back as no fault found, I just cant see this as being normal
Appreciate 0
      05-01-2020, 12:46 PM   #3
Dwaynos
Captain
Dwaynos's Avatar
United Kingdom
378
Rep
948
Posts

Drives: F10 M5 Monte Carlo Blue
Join Date: May 2018
Location: UK

iTrader: (0)

Quote:
Originally Posted by Taheemr View Post
it does seem to be less if i let the car idle for a few seconds from cold before selecting gear, I dont like letting the car idle when cold for obvious reasons.

I did have it checked but came back as no fault found, I just cant see this as being normal
What obvious reasons?
Appreciate 0
      05-01-2020, 02:25 PM   #4
Taheemr
Captain
United Kingdom
279
Rep
731
Posts

Drives: M6 GC
Join Date: Nov 2011
Location: Mids

iTrader: (0)

Quote:
Originally Posted by Dwaynos View Post
What obvious reasons?
get the car upto temp asap
Appreciate 0
      05-01-2020, 04:24 PM   #5
Dwaynos
Captain
Dwaynos's Avatar
United Kingdom
378
Rep
948
Posts

Drives: F10 M5 Monte Carlo Blue
Join Date: May 2018
Location: UK

iTrader: (0)

Quote:
Originally Posted by Taheemr View Post
get the car upto temp asap
You should let the car complete it's cold start cycle. Also, letting it idle for a "few seconds" certainly won't hurt it.
Appreciate 0
      05-04-2020, 03:44 AM   #6
OneExtra
Lieutenant Colonel
OneExtra's Avatar
United Kingdom
810
Rep
1,847
Posts

Drives: None
Join Date: Aug 2017
Location: England

iTrader: (0)

Quote:
Originally Posted by Dwaynos View Post
You should let the car complete it's cold start cycle. Also, letting it idle for a "few seconds" certainly won't hurt it.
Agree, I let my car idle until the revs drop to normal then I start driving, maybe about 15 seconds ish
Appreciate 0
      05-04-2020, 06:25 AM   #7
J11SEK
Second Lieutenant
J11SEK's Avatar
United Kingdom
268
Rep
226
Posts

Drives: F10 M5 2015
Join Date: Mar 2020
Location: UK

iTrader: (0)

Quote:
Originally Posted by OneExtra View Post
Quote:
Originally Posted by Dwaynos View Post
You should let the car complete it's cold start cycle. Also, letting it idle for a "few seconds" certainly won't hurt it.
Agree, I let my car idle until the revs drop to normal then I start driving, maybe about 15 seconds ish
Same, surely cold start is for oil circulation as well... so no load on engine until this is done! Like above 15secs or so....
Appreciate 0
      05-04-2020, 06:51 AM   #8
OneExtra
Lieutenant Colonel
OneExtra's Avatar
United Kingdom
810
Rep
1,847
Posts

Drives: None
Join Date: Aug 2017
Location: England

iTrader: (0)

Quote:
Originally Posted by J11SEK View Post
Same, surely cold start is for oil circulation as well... so no load on engine until this is done! Like above 15secs or so....
That's also my thinking especially when its been sat for 2 weeks
Appreciate 0
      05-06-2020, 02:26 AM   #9
schrickm5
Second Lieutenant
schrickm5's Avatar
76
Rep
298
Posts

Drives: 2013 M550d xdrive touring
Join Date: Jul 2013
Location: Sweden, (Europe)

iTrader: (0)

The bump is normal, I had it in my 14 and also in the 15. Only happens once though after a cold start.
__________________
2015 M5 CP Blue
[SIGPIC]

Previous Cars:- 2015 GTR > 2014 M5 CP > 2006 M6> 2007 M5 E61 > 2014 F31 328xi >2001 E39 530i > 1995 E34 M5 > 1999 Alpina B8 > 1992 E34 M5 >
Appreciate 0
      05-07-2020, 05:32 AM   #10
Taheemr
Captain
United Kingdom
279
Rep
731
Posts

Drives: M6 GC
Join Date: Nov 2011
Location: Mids

iTrader: (0)

Quote:
Originally Posted by schrickm5 View Post
The bump is normal, I had it in my 14 and also in the 15. Only happens once though after a cold start.
Yes correct only from cold, I started on a few morning this week and the let the car idle for a few seconds the gear engagement thump was less intrusive but still present
Appreciate 0
      05-07-2020, 06:13 AM   #11
PoolCar
Enlisted Member
17
Rep
47
Posts

Drives: F10M5, 997 - 911
Join Date: Jun 2019
Location: UK

iTrader: (0)

I don't know if this is 'normal' or not but I get no thump or
any noise at all when drive is selected.
Hope you can sort it out.
Appreciate 0
      05-07-2020, 01:28 PM   #12
Taheemr
Captain
United Kingdom
279
Rep
731
Posts

Drives: M6 GC
Join Date: Nov 2011
Location: Mids

iTrader: (0)

had it checked out, Sytner found nothing wrong, at times its so harsh its as if the gearbox is going to shatter
Appreciate 0
      05-07-2020, 02:13 PM   #13
ianm5
Private First Class
57
Rep
147
Posts

Drives: F10 M5
Join Date: Sep 2019
Location: UK

iTrader: (0)

Hi

My car is a 13 with c50k and the **gears** engage like butter, hot or cold. I don’t do any of the stuff described below on startup , I just drive away after seconds. What you describe is alarming. Are you sure it’s gears?

Is the thunk the normal pads ‘welding’ themselves to the disks? I used to leave a car on a seafront for 3 months. Pulling away needed 3000rpm. If I don’t drive for a while in the m5 there is a pad thunk. It would feel like a transmission thunk.
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 09:09 AM.




m5post
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