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      04-20-2017, 12:35 PM   #1
Padfan9
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Tranny thump sound - help

Hi Guys,

Last start I started to notice a thump when I lightly press down on my gas like the tranny is kicking in before acceleration. Maybe I just didn't notice that before, but is that normal?

When I slowly press down on the gas and ease into it it doesn't happen, only when I push down fast and it kicks in hard and I hear a thump and then there are no other issues or shifting problems.

Please help, thanks.
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      04-20-2017, 12:57 PM   #2
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Quote:
Originally Posted by Padfan9 View Post
Hi Guys,

Last start I started to notice a thump when I lightly press down on my gas like the tranny is kicking in before acceleration. Maybe I just didn't notice that before, but is that normal?

When I slowly press down on the gas and ease into it it doesn't happen, only when I push down fast and it kicks in hard and I hear a thump and then there are no other issues or shifting problems.

Please help, thanks.
I think someone would have to hear it in order to help, post a video if you can. I would just drive and enjoy it, if anything breaks take it to the dealer and they'll fix it under warranty
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      04-20-2017, 01:22 PM   #3
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Is your Auto Start/Stop active?
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      04-20-2017, 01:26 PM   #4
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these things are prone to making a clonck when the starting up from the autostop
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      04-20-2017, 02:15 PM   #5
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Is your Auto Start/Stop active?
Why they would even put this feature on the M5/6 is beyond me. That got coded out on day 1!
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      04-20-2017, 03:06 PM   #6
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Quote:
Originally Posted by M6-Coupe View Post
Is your Auto Start/Stop active?
Why they would even put this feature on the M5/6 is beyond me. That got coded out on day 1!
Yup me 2
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      04-20-2017, 03:19 PM   #7
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Quote:
Originally Posted by Taheemr View Post
these things are prone to making a clonck when the starting up from the autostop
Yes... There is an actuator over there and that noise is coming from that actuator every time the ASS (Automatic Start/Stop) is engaged.
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      04-20-2017, 04:14 PM   #8
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Quote:
Originally Posted by Taheemr View Post
these things are prone to making a clonck when the starting up from the autostop
Yes that sounds like it. It only happens when I press on the gas lightly but fast if that makes sense.
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      04-20-2017, 04:16 PM   #9
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Quote:
Originally Posted by M6-Coupe View Post
Quote:
Originally Posted by Taheemr View Post
these things are prone to making a clonck when the starting up from the autostop
Yes... There is an actuator over there and that noise is coming from that actuator every time the ASS (Automatic Start/Stop) is engaged.
Do you mean the button next to start up? Mine isn't on but it's just in 3 mode sport plus and light and fast on the gas it clunks but then when I ease on the gas or press really it doesn't do anything.
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      04-20-2017, 04:27 PM   #10
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Quote:
Originally Posted by Padfan9 View Post
Quote:
Originally Posted by M6-Coupe View Post
Quote:
Originally Posted by Taheemr View Post
these things are prone to making a clonck when the starting up from the autostop
Yes... There is an actuator over there and that noise is coming from that actuator every time the ASS (Automatic Start/Stop) is engaged.
Do you mean the button next to start up? Mine isn't on but it's just in 3 mode sport plus and light and fast on the gas it clunks but then when I ease on the gas or press really it doesn't do anything.
This one. Turn it off
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      04-20-2017, 07:05 PM   #11
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Quote:
Originally Posted by M6-Coupe View Post
Is your Auto Start/Stop active?
No, that's not it, lol. But I did check it right after it happened.
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      04-20-2017, 07:15 PM   #12
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Quote:
Originally Posted by M6-Coupe View Post
Quote:
Originally Posted by Padfan9 View Post
Quote:
Originally Posted by M6-Coupe View Post
Quote:
Originally Posted by Taheemr View Post
these things are prone to making a clonck when the starting up from the autostop
Yes... There is an actuator over there and that noise is coming from that actuator every time the ASS (Automatic Start/Stop) is engaged.
Do you mean the button next to start up? Mine isn't on but it's just in 3 mode sport plus and light and fast on the gas it clunks but then when I ease on the gas or press really it doesn't do anything.
This one. Turn it off
Turn it off? I leave it on because I don't want my car shutting off and turning back on every time I stop the car.

When I let go of the brake and go to press the gas and press it, it clunks for a second before going, and only upon light fast pressing.
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      04-20-2017, 11:02 PM   #13
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Quote:
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Turn it off? I leave it on because I don't want my car shutting off and turning back on every time I stop the car.

When I let go of the brake and go to press the gas and press it, it clunks for a second before going, and only upon light fast pressing.
I meant turn ASS off ... NO Auto Start/Stop
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      04-22-2017, 07:50 AM   #14
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a few less posts in here and a lot quieter today! Padfan9 - good luck diagnosing the issue, if there is one. With M cars, very often the answer is to just drive it harder - they are meant to be driven not coddled!
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      04-22-2017, 10:18 AM   #15
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I remember when I first got the car and used to shift in S3 or M3 mode and it would cause some thunks between shifts. Not sure if this is the same kind of funk.
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      04-24-2017, 08:34 AM   #16
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Quote:
Originally Posted by Padfan9 View Post
Hi Guys,

Last start I started to notice a thump when I lightly press down on my gas like the tranny is kicking in before acceleration. Maybe I just didn't notice that before, but is that normal?

When I slowly press down on the gas and ease into it it doesn't happen, only when I push down fast and it kicks in hard and I hear a thump and then there are no other issues or shifting problems.

Please help, thanks.
its just the noise of the transmission engaging, since you're tapping on the gas lightly but fast, it wants to shift gears, but when u ease of the gas, the transmission disengages. so it's just that engaging and disengaging noise. my f82 and f13 make the same noise when i do that. hope that helps!
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      04-24-2017, 04:27 PM   #17
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Quote:
Originally Posted by nicklin0809 View Post
Quote:
Originally Posted by Padfan9 View Post
Hi Guys,

Last start I started to notice a thump when I lightly press down on my gas like the tranny is kicking in before acceleration. Maybe I just didn't notice that before, but is that normal?

When I slowly press down on the gas and ease into it it doesn't happen, only when I push down fast and it kicks in hard and I hear a thump and then there are no other issues or shifting problems.

Please help, thanks.
its just the noise of the transmission engaging, since you're tapping on the gas lightly but fast, it wants to shift gears, but when u ease of the gas, the transmission disengages. so it's just that engaging and disengaging noise. my f82 and f13 make the same noise when i do that. hope that helps!
Perfect! It does help, thank you!

I went and test drove a new M6 this weekend and it also made the same sound.
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      04-25-2017, 02:41 AM   #18
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Just to lay this one to bed, i have an M5 f10 comp pack BMW loan car whilst my M6 is being repaired, it makes the same noise, as does a close relatives stock f10 M5, they are all 2016 manufactures cars.
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      04-25-2017, 12:40 PM   #19
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Just to lay this one to bed, i have an M5 f10 comp pack BMW loan car whilst my M6 is being repaired, it makes the same noise, as does a close relatives stock f10 M5, they are all 2016 manufactures cars.
Awesome, thank you!
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      04-28-2017, 10:54 PM   #20
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Quote:
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I meant turn ASS off ... NO Auto Start/Stop


love it ... turn "ASS" off


Love the acronym


Good one M6-Coupe ... and to think I didn't want to read this thread
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      04-28-2017, 11:58 PM   #21
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love it ... turn "ASS" off


Love the acronym


Good one M6-Coupe ... and to think I didn't want to read this thread
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