12-23-2018, 06:25 AM | #89 | |
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The undertray is more of a buzzing sound. The drivetrain vibration/noise is a lower frequency level drone/hum. |
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12-24-2018, 08:51 AM | #90 | |
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12-25-2018, 09:34 PM | #91 |
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Its the driveshaft, Ive had mine replaced.
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04-16-2019, 01:53 PM | #92 |
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Oh crap, I think I might have this issue.
Really strange as it has started really suddenly, as people have said, starts around 80mph, gets worse as you approach 100mph (on a private road/track). Just had the rear tyres changed, I thought these were the culprit, will get these checked first, then see if I need to talk to BMW. I also have my winter wheels, so will swap these back on to see if the problem goes away. B48 330i F31 LCI 2017 8AT 19" 442M Bridgestone Potenza S001 RFT 24,000 miles
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Last edited by IanW555; 04-16-2019 at 02:23 PM.. |
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07-30-2019, 10:29 AM | #93 |
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Another sad one here.
Just got my f30 320i msport - a year old 08-2018, 25.000km. Same problem as above. Lower freq hum between 100 - 125kmh and afterwards turns to a vibration and as speed builds up so does the vibration. Tried tyre change, wheel alignment all that stuff wheel related. Nothing improved. Did anyone find the problem or the solution? Thanks. B48M 8AT 18 dunlop sport rt maxx 25.000 km |
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07-30-2019, 10:47 AM | #94 |
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^ same. Him/whistle type sound around 60ish mph then 82-95mph vibration. Tires were road force balanced and all weights taped with racing tape.
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07-30-2019, 11:21 AM | #95 | |
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Thanks. |
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07-30-2019, 12:50 PM | #96 |
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Ah ok thank you. I had the fluid replaced about 6k miles ago and still there. I guess I'll live with it too. I'll most likely rebalanced wheels and my control arms up front are due for replacement. Hopefully those two things solve it. But of course I'll put the car in neutral when it vibrates to isolate the parts on the car
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07-30-2019, 12:58 PM | #97 | |
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I thought it was mainly affecting older 3/428 MT cars. But to see it on newer 8AT cars as well... Seems to be something related to the drive/prop shaft. I had mine changed under warranty and it seemed to work for a while but the issue came back. Whenever I took it to BMW they said it was the diff. I swapped out the diff, drive/prop shaft but the issue was still there. I took it to several BMW specialist, no one could pinpoint the cause. In the end I got rid of the car. But I think it maybe something within the transfer case as I tried everything else. |
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07-31-2019, 03:34 AM | #98 | ||
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It's a pitty that even this brand gave up on quality. The price should be cut in half I guess. Thanks! |
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07-31-2019, 04:26 PM | #99 |
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new drive test - vibration gone
Dear colleagues,
the strangest thing happened today: did a drivetest with a good friend to show him the problem and we went on the newest highway around. All vibration gone!! I was speechless. Went up to 170kmh, nothing. The hum between 100 and 125 kmh still there but no vibration whatsoever. Nothing! Yesterday I went on an old highway, the car was shaking like jelly at 170kmh. Very constant shake like a bent rim. Only one conclusion comes out: the m sport suspension is so sensible that if the road is not perfect, the car vibrates a lot! Any thoughts on this? 320i 2018 b48m 8at m sport cheers! |
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07-31-2019, 05:00 PM | #101 |
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Mine starts at 70mph. I can see my passenger seat headrest vibrating it's so bad. I've had the wheels and tires balanced and aligned at least twice, no change. Has to be steering rack or driveshaft right?
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08-01-2019, 04:26 AM | #102 | |
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I suggest what you are feeling must be road induced. Whether simply what we feel on bad roads, or there are issues with the suspension causing the shaking like jelly, components like soft bushings or faulty dampers, not supressing road imperfections. |
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08-01-2019, 04:30 AM | #103 |
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Have you tried a different wheel set, a set you know have no issues. You have to eliminate wheel issues which can be hidden from any balance, even a road force balance. The speed where the vibration occurs still indicates wheels could be at fault.
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08-01-2019, 08:05 AM | #104 |
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I have my stock 400M/Runflats I may need to try that
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08-01-2019, 08:42 AM | #105 | |
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The first time I had it, when you reached above 90 mph, you could see the back wind screen going fuzzy in the rear view mirror due to the vibration. After it was fixed the first time I wasn't getting a vibration even at high speed. It was more of a low level droning that was constant, almost like tyre rumble but was was always there even when you let off the accelerator pedal. It could easily be mistaken for tyre noise on rough roads, but you could hear it better on smooth roads. I swapped out brand new BMW wheels and tyres but it made no difference. |
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08-01-2019, 09:00 AM | #106 | |
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I don't trust BMW dealership technicians with their diagnoses anymore. They acknowledged that there was a vibration when they sat in the car but then said it was the diff when it wasn't. I'm suprised a big car company like BMW doesn't have any specialist tools to attach to parts of the car that would easily show where the vibration is coming from. All they do is raise the car and spin the wheels, as the vibration only happens at high speed, they can't spin the wheels fast enough or under load to replicate the problem so are usually just guessing what they think it is. |
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08-01-2019, 09:07 AM | #107 | |
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08-02-2019, 06:17 AM | #109 |
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Yes that is correct. the car is ok, but still I find it really odd to feel the road so so bad when the pavement isn't perfect! probably the lowered msport suspension has this problem.
still the humm is there between 100 and 120kmh and also appears at exactly 155kmh, before and after all good. Still in doubt what to do. |
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08-02-2019, 06:51 AM | #110 | |
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