Car jumps/bangs after coming off a stop!

[Rainer M]

Originally Posted by madrit21

Changed out the solenoids in the mechatronics. New mounts. Still same issue.

Hard to believe that the clutch is gone after only 30.000.
You mentioned that did a fluid flush / change.
How would it look if the wrong fluid was used?
Getrag and BMW state that it destroyes the gearbox.
When early M's got and oil change at the 1.200 mile service with the wrong fluid (automatic gear is oil instead the pentosin), they replaced the whole thing.

I wonder how the gearbox would behave with the wrong fluid.

Do you have paperwork stating what was used?

[madrit21]

Originally Posted by Rainer M

Hard to believe that the clutch is gone after only 30.000.
You mentioned that did a fluid flush / change.
How would it look if the wrong fluid was used?
Getrag and BMW state that it destroyes the gearbox.
When early M's got and oil change at the 1.200 mile service with the wrong fluid (automatic gear is oil instead the pentosin), they replaced the whole thing.

I wonder how the gearbox would behave with the wrong fluid.

Do you have paperwork stating what was used?

I'll check the paperwork as soon as i get a chance and ill get back to you. Its Been a nightmare 😫

[Theodore]

It's worth checking on your car's driveshaft components to include the Guibo (aka flex disc). Here is a good video example of a Guibo that is failing:

And a failing driveshaft center support (skip to 0:56 minute mark to see the acceleration behavior from a stop):

[madrit21]

Originally Posted by Theodore

It's worth checking on your car's driveshaft components to include the Guibo (aka flex disc). Here is a good video example of a Guibo that is failing:

And a failing driveshaft center support (skip to 0:56 minute mark to see the acceleration behavior from a stop):

This sounds very similar to my cars issue. The weird thing is it does it after ive driven for about 10 minutes

[Helmsman]

Originally Posted by Rainer M

Hard to believe that the clutch is gone after only 30.000.
You mentioned that did a fluid flush / change.
How would it look if the wrong fluid was used?
Getrag and BMW state that it destroyes the gearbox.
When early M's got and oil change at the 1.200 mile service with the wrong fluid (automatic gear is oil instead the pentosin), they replaced the whole thing.

I wonder how the gearbox would behave with the wrong fluid.

Do you have paperwork stating what was used?

Yeah 30k is nothing for these clutches. Double check fluid type is a good idea. Dealer filled mine with MT fluid, long story short ended with a new box and cooler. Pentosin and nothing else should go in.

[madrit21]

Update: Clutch did not need replacement. Turns out my mechatronics is on its way out.

[madrit21]

Update:

So i had the transmission out and inspected. There was a broken bolt that was found. Not sure exactly where it was but the shop is strongly confident that this broken bolt inside the dct was causing the bang off a stop. Mounts were in good shape.

[EdGomez11]

Originally Posted by madrit21

Had all the recent updates done and the clutch readapted. Still having the same issue. What a nightmare.

I have found the cause to this problem....

This is due to a internal component failure. I've in fact removed 3 different DCT's and found this issue. If your able to catch it in time the mechatronic wont get permanently damaged. There is a way to test for this condition and further steps can be taken to permanently fix the failure from happening.

[EdGomez11]

Originally Posted by madrit21

Update:

So i had the transmission out and inspected. There was a broken bolt that was found. Not sure exactly where it was but the shop is strongly confident that this broken bolt inside the dct was causing the bang off a stop. Mounts were in good shape.

I'm glad i was able to find this post. I was the Tech that removed the DCT and Inspected the internal components and found the broken bolt. I've been doing a lot of digging into this issue and found the cause and affect. I will be removing the DCT out of my personal M3 and recording step by step on how to prevent this from happening. I believe that ALL the DCT transmission should be checked for this condition before the major bolt failure.

[Wally1552]

Originally Posted by EdGomez11

I'm glad i was able to find this post. I was the Tech that removed the DCT and Inspected the internal components and found the broken bolt. I've been doing a lot of digging into this issue and found the cause and affect. I will be removing the DCT out of my personal M3 and recording step by step on how to prevent this from happening. I believe that ALL the DCT transmission should be checked for this condition before the major bolt failure.

What the name of your shop and location?

[Timujin]

Originally Posted by EdGomez11

I'm glad i was able to find this post. I was the Tech that removed the DCT and Inspected the internal components and found the broken bolt. I've been doing a lot of digging into this issue and found the cause and affect. I will be removing the DCT out of my personal M3 and recording step by step on how to prevent this from happening. I believe that ALL the DCT transmission should be checked for this condition before the major bolt failure.

Wow!

Meanwhile, can you tell us where & why the bolt fails? Until then, I will continue to come to a complete stop & count to 3 when going from R to D & D to R. When parking the car my foot will stay on the brake while I pull the parking brake. I will say many prayers too.

Glad the bolt was found.

[bmwlover0725]

This is one reason I'm happy to have a 6MT. DCT's are cool, but I've always been afraid of problems with automatics. Plus I love shifting. Hopefully this gets fixed for you!

[wfdeacon88]

Originally Posted by bmwlover0725

This is one reason I'm happy to have a 6MT. DCT's are cool, but I've always been afraid of problems with automatics. Plus I love shifting. Hopefully this gets fixed for you!

This DCT (not an automatic) is pretty amazing and reliable. it's a blast to drive and matches the engine perfectly.

[Timujin]

Originally Posted by wfdeacon88

This DCT (not an automatic) is pretty amazing and reliable. it's a blast to drive and matches the engine perfectly.

Originally Posted by wfdeacon88

This DCT (not an automatic) is pretty amazing and reliable. it's a blast to drive and matches the engine perfectly.

7 speed FTW

[madrit21]

Update: I had the broken bolt replaced and put the trans back on the car. I start her up and give it a shot to see if the bang/jump was fixed. Unfortunately, the bang was back. At this point, i was over it and lost interest in trying to fix it. Drove my way to BMW and picked up a new f80 comp. Absolutely love it but i also plan on owning another e92 down the road.

[Timujin]

Problem solved. Congrats!

[Wally1552]

Originally Posted by Timujin

Problem solved. Congrats!

That is certainly one way to solve it. Enjoy the new car

[Theodore]

Originally Posted by EdGomez11

I'm glad i was able to find this post. I was the Tech that removed the DCT and Inspected the internal components and found the broken bolt. I've been doing a lot of digging into this issue and found the cause and affect. I will be removing the DCT out of my personal M3 and recording step by step on how to prevent this from happening. I believe that ALL the DCT transmission should be checked for this condition before the major bolt failure.

EdGomez11 is the bolt that causes issues in any of these pictures?

[ygoz]

Bumping this as this is the exact issue I am experiencing.

DCT recently serviced with new filter and oil, but the problem was there before. no codes.
Has anyone ever encounter this and successfully diagnose/fix in ways that do not include selling the car or swapping the tranny?

[madrit21]

Originally Posted by ygoz

Bumping this as this is the exact issue I am experiencing.

DCT recently serviced with new filter and oil, but the problem was there before. no codes.
Has anyone ever encounter this and successfully diagnose/fix in ways that do not include selling the car or swapping the tranny?

I miss the e92 but definatey dont miss this issue lol

Please let me know if you end up finding a fix. Good luck!

[ygoz]

Originally Posted by madrit21

I miss the e92 but definatey dont miss this issue lol

Please let me know if you end up finding a fix. Good luck!

Thanks buddy!

Just to confirm, you have tried:

Replacing the mechatronic (fully, or rebuild/refurbished)?
Replacing the clutch pack (basket as well? or only the plates?)
Addressing the stripped/broken bolt.
And a general adaptations reset + oil service for the tranny.

None of these helped

[madrit21]

Originally Posted by ygoz

Thanks buddy!

Just to confirm, you have tried:

Replacing the mechatronic (fully, or rebuild/refurbished)?
Replacing the clutch pack (basket as well? or only the plates?)
Addressing the stripped/broken bolt.
And a general adaptations reset + oil service for the tranny.

None of these helped

I did all of the above^

It drove me crazy to the point where i was going to buy a new dct and have bmw put it in but had the it h for an f80. Still wish i had the v8 though