10-03-2016, 07:55 PM | #1 | |||||||||||||||||||||||||||||||||
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The M2 and the 'soda can crunch noise' issue: compilation of some experiences
Extracted several posts from the lengthy "Updated car differentials" thread reporting about the 'soda can crunch noise' issue.
Enough similar experiences reported worth a little compilation in a separate thread. FWIW, from the BMW rear axle differential replacement 0033990100 'Technical Action' doc (July 19, 2016) (see here): "Auswirkungen: Die Lamellen im Hinterachsgetriebe verschleißen sehr schnell. Es kommt zu massiven Geräuschen im Hinterachsgetriebe."Makes you kinda wonder whether this might be a sound explanation [pun intended] for the weird metallic ramble that several M2 forum fellows reported about (an occasional, peculiar grinding/screechy rambling noise coming from the rear underside). Or is it totally unrelated to the ongoing rear axle differential replacement of several ///M cars ? We don't know yet. Personally I heard the 'soda can crunch noise' already many times on my M2 (April 2016 build - approx. 12K kms clocked). Though, to be perfectly fair with all of you, I never experienced it affecting the driving behavior of the car. Why calling it an "issue" rather than a "gimmick" ? Well, it is definitely a nuisance, rather unsettling each time it takes you by surprise. Recurrent, but no frequency pattern + you cannot provoke it (making it hard to show it to your dealer). So, should you ever hear this noisy gremlin in action (lasts only a brief moment; sometimes happens twice [brief sequence]), do know that you're not alone + nothing fell off your M2. LAST UPDATE: OCT 4, 2016 Quote:
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Two brief dashcam videos courtesy of forum fellow 'Prodigy' showing the 'soda can crunch noise': 00:06 00:03 and 00:10 See also this thread http://f87.bimmerpost.com/forums/sho....php?t=1350056 referring to PuMA # 61199185-05:
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Last edited by Artemis; 02-04-2017 at 09:53 AM.. Reason: Added videos |
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10-05-2016, 07:30 AM | #2 |
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Same here.... Heard it about 5 times now in 25K, and the first times I was like what the heck is that noise... Especially now that my ASD is disengaged I noticed it a lot more.
Someone mentioned above there is a video of it. Can anyone share it here? All in all, it feels like I only hear it when the car is cold and I drive off from a parking spot. It is not happening when the car is warm, at least I did not hear it when it was warm. It is definitely at my right side and not on the left of the car. Not sure if anyone else noticed it like that. The noise sometimes sounds like driving over a pothole in the road resembling the soda can crunch noise. At first I thought it could be the brakes or the suspension making noise. I never thought about the diff. MR |
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10-05-2016, 07:56 AM | #3 |
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I have also had heard the same sound. No so much in the last month or so but at least once a week for the first 4 months or so. I have about 12k miles on my car and it is going in for service this week. I am going to let the service guy know about it and see what he says.
Doesn't seem to be any rhyme or reason to the noise and it does not unsettle the car.
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10-05-2016, 09:18 AM | #4 |
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I heard the exactly same sound twice now. I couldn't explain it to my SA exactly but basically sounded like a two metallic parts grinding against each other momentarily and then the frequency increasing as I increase speed. It is intensely loud but then just disappears after a few minutes.
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10-05-2016, 09:37 AM | #6 |
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Sometimes I hear a noise coming from the rear, which I think must be from the differential. I hear the sound of moving metal pieces somewhere inside, just like moving one another and mostly when the car starts rolling.
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10-05-2016, 09:48 AM | #7 |
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Yupppppp this has happened to me several times already in the past 3 months with the car. At least 8-10 times. Yesterday was the most recent and in a parking lot turning slowly I got out and literally looked under the car and behind each wheel everyone looking at me all weird. Hopped back in drove away and it disappeared as usual and that was that. Never affects anything while driving but definitely a loud enough sound.
I reported it to my dealer when I brought the car in for tints and other few modifications and they said I had glass in my trunk that wasn't secured and he secured it and that was it 😒😒😒. Obviously they didn't hear it and had to make an excuse. Hopefully someone can figure out what it ACTUALLY is and if it will have any long term affect on the vehicles experiencing it. |
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10-05-2016, 09:53 AM | #8 |
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I heard it once in 1600 miles that I have put on the car. I was backing out out my driveway and I thought I scraped an exhaust tip on the ground as there is a slight incline to my driveway. But when I got out to look there were no marks on the tips. I had no clue this was an issue until I just saw this.
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10-06-2016, 01:53 AM | #9 | |
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10-06-2016, 04:10 AM | #10 |
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10-06-2016, 05:33 AM | #11 |
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Have had it a couple of times. I assumed it was a rock in the dust shield of the brake. That's the best explanation I've found for thr infrequency and inability to replicate.
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10-06-2016, 07:05 AM | #13 | |
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All at low speed while turning. Brief sound that sounds like I've run over a soda can. Same sound all 3 times. |
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10-06-2016, 07:06 AM | #14 | |
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10-06-2016, 07:30 AM | #15 | |
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10-06-2016, 08:02 AM | #16 | |
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After that a few times more, but only just after I started up the car. Never happens when the car is really warm... or at least I did not hear it. MR |
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10-06-2016, 11:19 AM | #17 |
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How many of you have had this soda can crunch noise AFTER you did the rear diff recall?
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10-06-2016, 12:00 PM | #18 | |
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As described earlier: some strange grinding noise coming from the back underneath; a briefly screeching metallic sound of some metal part rubbing against another metallic part; a kind of metallic rambling (or some rambling inside a metallic box), as if some part moves in a controlled way from one side to another (opening or closing of a part) but with an awful rambling noise. A bit like the crunching sound of rolling over a soda can. Always exactly the same sound. Happens at random, sometimes twice right after each other, mostly when the car is not under load (for example cruising at slow speed or after coming out of a turn).
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10-06-2016, 12:20 PM | #19 | |
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10-06-2016, 12:28 PM | #20 |
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Video definitely helps. I actually heard this sound a few weeks ago when leaving work. I had my window down and I thought I ran over something so I looked back and nothing. I was moving at parking lot speeds, so like 5 -10 mph.
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10-06-2016, 07:24 PM | #21 |
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I have a 08/16 MY 2017 M2. Today with 830 miles and my windows down, I heard two different noises twice w/in 5 miles. Both times I thought to myself 1) was that me 2) did I run over something 3) is this the diff noise that everyone is talking about?
The first time it was somewhat loud and sound like something was loose in the trunk and flew forward when I came to a stop going up a hill. The second time I as I was driving and it sounded like a large aluminum can being crunched or sheet of aluminum flapping in the wind ~2 feet away from the rear left side of the car. |
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10-07-2016, 07:53 AM | #22 |
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So mine started making a sound today. Only for the duration of any sweeping right turns coming from the driver's side rear. There's nothing stuck. It sounds like lightly grinding metallic sound.
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