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      11-14-2017, 08:01 PM   #1
BlatantMaple854
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Help - strange DCT noise in third and forth gear (with videos)

Hello everyone,

I have a 2017 ZCP DCT f80 M3 with a strange vibrating/grinding noise when accelerating between 2500 and 3500 rpm. Happens mostly when the vehicle is cold but have encountered the issue when warm as well. Seems to appear more often when going up hill.

The car is going into service tomorrow for a ride along, but we all know sounds seem to disappear as soon as a shop Forman is in the passenger seat. Please see linked videos below.

Does anyone have any idea of what could be causing this issue? Thank you so much for any replies!!



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      11-14-2017, 11:05 PM   #2
silvergray545
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Really hard to tell from the video. Could be something silly like a heat shield or it could be something like a wastegate rattle. Keep us posted.
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      11-14-2017, 11:32 PM   #3
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The F30 N55 cars had a similar issue. Don't know how helpful it would be but here's the thread:
http://f30.bimmerpost.com/forums/sho...d.php?t=949816
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      11-14-2017, 11:43 PM   #4
BlatantMaple854
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Could this be engine knock?
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      11-14-2017, 11:57 PM   #5
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Kind of a dumb question but are you running premium .. ??
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      11-15-2017, 12:12 AM   #6
BlatantMaple854
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Yes, absolutely every time. I fill up at a fairly new shell gas station with premium 93. Only one time, I accidentally mixed 4 gallons of 87 with 12 gallons of 93. Which averages out to about 91.5 octane (still better than Cali gas lol)

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Kind of a dumb question but are you running premium .. ??
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      11-16-2017, 01:35 AM   #7
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I think I hear something similar but only when cold. Are you stock?
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      11-16-2017, 09:58 AM   #8
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Quote:
Originally Posted by 2jssepa View Post
I think I hear something similar but only when cold. Are you stock?
Completely stock and it turns out the noise is present even when fully warmed up and under load.
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      11-16-2017, 10:21 AM   #9
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Definitely not normal. I tried listening for a similar sound in my car and nothing. Let us know how your dealership visit goes. Curious as to what the issue may be.
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      11-17-2017, 05:57 AM   #10
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Weird. I had this similar noise on my old E92 M3. Seemed to be coming from somewhere in the dash. Dealer never figured it out. It never really affected performance or anything either so nothing was done in the end, and it was faint enough where you wouldn't be able to hear it if you weren't paying close attention.
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      11-17-2017, 09:53 AM   #11
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Quote:
Originally Posted by Ever. View Post
Weird. I had this similar noise on my old E92 M3. Seemed to be coming from somewhere in the dash. Dealer never figured it out. It never really affected performance or anything either so nothing was done in the end, and it was faint enough where you wouldn't be able to hear it if you weren't paying close attention.
Hopefully, thatís not whatís going on here. I hate unknown noises. Car is still with the dealer. I hope to here an update today.
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      11-20-2017, 09:30 PM   #12
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Definitely not normal, but also definitely not the DCT. Let us know what they find.
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      11-28-2017, 02:57 AM   #13
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Hi OP,

Any feedback after your visit to the dealer?
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      11-28-2017, 10:29 AM   #14
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Quote:
Originally Posted by 2jssepa View Post
Hi OP,

Any feedback after your visit to the dealer?
Nothing definitive yet. The tech thinks it could be the carbon front splitter and lip are lose from a poor installation. They are ruling that out first before they try anything more teachnical.

I have my doubts about that being the issue...
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      11-29-2017, 05:02 PM   #15
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Quick Update: tightening loose bolts in the bumper did nothing. They also changed the blower motor and replaced the valvetronic motor. No change...

An engineer will be at the dealership on Friday to take a look. I am starting to get really pissed off. I’ve been without my car for over a week and a half.....
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