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      01-22-2021, 01:10 PM   #1
Del Funko
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Question Help please from M4 owners

So I just bought a 2016 M4 (DCT), 14k miles on it, good nick etc.
Before this was a 2014 640d, with the 8 speed ZF auto.

Now I have noticed that, when starting up from cold, and i drive off, when it shifts into 2nd there's a bit of a rumbling sound for a second.

Once it's done with that, that's it, doesn't happen again until the next cold start.
And it does it almost every time, after cold start.

Just wondering if this is a "characteristic" of the DCT, or should I start investigating further.

Thanks
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      01-22-2021, 01:16 PM   #2
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I've also got a 2016 M4 DCT and I've never noticed anything like that on mine. The coldest weather mine has ever been in on a cold start though is around 5C.
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      01-22-2021, 01:25 PM   #3
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Quote:
Originally Posted by Del Funko View Post
So I just bought a 2016 M4 (DCT), 14k miles on it, good nick etc.
Before this was a 2014 640d, with the 8 speed ZF auto.

Now I have noticed that, when starting up from cold, and i drive off, when it shifts into 2nd there's a bit of a rumbling sound for a second.

Once it's done with that, that's it, doesn't happen again until the next cold start.
And it does it almost every time, after cold start.

Just wondering if this is a "characteristic" of the DCT, or should I start investigating further.

Thanks
I have the exact same thing, on dct, any cold start the first shift from first to second there is a clunk, not a rumble in my case but a clunk.

Especially in cold weather here in canada you can hear it. After that it never happens again.

Had the car 30k miles no issues, has always done it i believe it's a characteristic of the transmission when ice cold.
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      01-22-2021, 01:50 PM   #4
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From 1st to 2nd there is sometimes a clunk, it doesn't get super cold where I am though. Not a rumbling noise though.
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      01-22-2021, 01:55 PM   #5
Del Funko
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Thanks guys I should probably try make a video of it, so you can hear it.
I know the clunk you speak of.

Wondering if anyone knows how this particular DCT works, and what actuator makes the change or what moves to shift from 1st to 2nd?
Wondering if that could be making this sound.
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      01-22-2021, 06:08 PM   #6
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My car had a brief grind like noise when it was first taking off after sitting for a while. I made a thread on it a while back but never figured it out 100%, though my noise sounded like it was from the back maybe diff/fuel pump area.

https://f80.bimmerpost.com/forums/sh....php?t=1708554

I left it alone for a while until one day the dealer did a software update and I never heard the noise again. If your noise is similar its just something software/programming related I wouldn't worry especially since it just does it once at an exact point every time.
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      01-23-2021, 06:13 AM   #7
Del Funko
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Quote:
Originally Posted by Ninjasteezify View Post
My car had a brief grind like noise when it was first taking off after sitting for a while. I made a thread on it a while back but never figured it out 100%, though my noise sounded like it was from the back maybe diff/fuel pump area.

https://f80.bimmerpost.com/forums/sh....php?t=1708554

I left it alone for a while until one day the dealer did a software update and I never heard the noise again. If your noise is similar its just something software/programming related I wouldn't worry especially since it just does it once at an exact point every time.
Yes that sounds like it alright.

This is the sound mine makes, just after shifting into 2nd, at 0:09

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      01-23-2021, 08:53 AM   #8
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I have a '15 M3 with the exact same drivetrain, and no clunk from 1st to 2nd after a cold start. I always let the car warm up to the point where the fast idle slows down and the wastegates close (around 90 seconds) before driving off. I also have had the diff and M-DCT reprogrammed to GTS level, though.
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      01-24-2021, 03:54 AM   #9
Ninjasteezify
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Quote:
Originally Posted by Del Funko View Post
Yes that sounds like it alright.

This is the sound mine makes, just after shifting into 2nd, at 0:09

Yep that sounds exactly the same as what I had. Always after sitting for a while and first taking off. Never again the rest of the drive. I heard it every day until one day at the dealer they mentioned the I have very old software and they can go ahead and update it for me. Since then I've not heard the noise at all and its been 8 months.

You can get the update if you really want but in hindsight I dont think what I had was an issue per se. Could be a software glitch or could be something that was actually programmed but it never affected how the car drove and was not a constant noise.
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      01-24-2021, 04:06 AM   #10
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Quote:
Originally Posted by Ninjasteezify View Post

You can get the update if you really want but in hindsight I dont think what I had was an issue per se. Could be a software glitch or could be something that was actually programmed but it never affected how the car drove and was not a constant noise.
Getting a software update is also a good idea regardless, as OP has a 2016 and the software has been refined significantly over the years.
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      01-24-2021, 12:18 PM   #11
Del Funko
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Thanks lads, i was going to bring it in for an oil service shortly anyhow, so will ask for the software update while there.
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