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      05-01-2020, 08:14 AM   #1
Taheemr
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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
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      05-01-2020, 08:33 AM   #2
M5theonlyone
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Quote:
Originally Posted by Taheemr View Post
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
You should get a little 'phut' when first putting it in D or R when the fluid is cold then that disappears when warm. Try warming it up a bit more and if it's still that bad and gets worse I'm afraid it's to the auto g/box specialist.
*
*A while ago the same thing as you describe was happening to our CLK Sport s/auto box, difficult sudden engagement,lurching forward,changing gears unusually and took it to auto box specialist. Turned out nothing mechanically wrong with g/box itself but the electronic motherboard that controls the 'box gear engagement needed rebuilding and re soldering. They sent the board off to a place in Chester for re building,changing the diodes etc then re-installed it and there's a pipe from g'box that has trans fluid running through it connected to the board. Works like new now and have 1 year guarantee.

Last edited by M5theonlyone; 05-01-2020 at 09:58 AM..
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      05-01-2020, 11:56 AM   #3
Taheemr
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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
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      05-01-2020, 12:46 PM   #4
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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?
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      05-01-2020, 02:25 PM   #5
Taheemr
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Originally Posted by Dwaynos View Post
What obvious reasons?
get the car upto temp asap
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      05-01-2020, 04:24 PM   #6
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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.
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      05-04-2020, 03:44 AM   #7
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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
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      05-04-2020, 06:25 AM   #8
J11SEK
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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....
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      05-04-2020, 06:51 AM   #9
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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
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      05-06-2020, 02:26 AM   #10
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The bump is normal, I had it in my 14 and also in the 15. Only happens once though after a cold start.
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      05-07-2020, 05:32 AM   #11
Taheemr
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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
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      05-07-2020, 06:13 AM   #12
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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.
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      05-07-2020, 01:28 PM   #13
Taheemr
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had it checked out, Sytner found nothing wrong, at times its so harsh its as if the gearbox is going to shatter
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      05-07-2020, 02:13 PM   #14
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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.
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