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07-18-2019, 03:19 PM | #1 |
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Driveline vibration taking off from stop?
Hey guys!
Did a search and didn't see much like this, and just looking for a place to start. I have a 2008 M3 with ~109k miles, 6MT. Recently, I've been experiencing a small vibration when taking off from a stop. It feels kinda like running over the rumble strips on the side of a highway, though not nearly as severe. You can, however, feel it through the whole car (pedals, steering wheel, seat, etc). No noise really accompanies it, you just feel the shudder / vibration. This vibration is never obvious or noticeable once you're moving, just around 3k RPM when taking off abruptly from a dead stop. Again, nothing severe and it feels like something just beginning to wear out, but annoying as the rest of the car feels excellent. It doesn't affect your ability to control the car or bog the car down, just presents a slight shudder through the chassis. I have within the last 1,000 miles replaced my motor mounts, tires, plugs, and coils, so it's PROBABLY none of those things, but I'm not sure what other maintenance has or hasn't been done since I have no records for the car. Anybody experienced anything similar or have somewhere to start? Thanks! Last edited by GoodTime; 07-18-2019 at 04:34 PM.. |
07-18-2019, 03:43 PM | #2 |
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to start with the easy things
1- check the Guibo, and the driveshaft center bearing 2- Swivel joint of the driveshaft that connects to the diff if the above are intact you will have to start digging deeper (maybe try revving to 1500 2000 rpms while standing still on neutral, if you do feel something than the above would be good as they are moving parts) 1- Since you feel it in the pedals and only upon take offf, i would say this sounds like a flywheel issue, if it lost balance, or have an uneven surface. 2- vibration pulley, but that would lead to a vibration on higher RPMs as well. I have been facing vibrations on my DCT and I think im taking the plunge to change the flywheel soon.
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07-18-2019, 04:33 PM | #3 | |
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10-07-2019, 08:44 AM | #4 |
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Update here:
I think Makaveli7 is onto something with the flywheel issue. At least on a visual inspection and getting under the car and shaking everything, the driveshaft and all rear suspension components are free from any play or visible deterioration. I'm at 109k on the original clutch, so I'm likely due for that soon and will do the flywheel at the same time. Wish it was something easier to get to, but with no other obvious causes and no presentation of the issue at speed, that seems the most likely now. |
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10-07-2019, 11:45 AM | #6 | |
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I don't feel any vibration at idle, but like yours mine is completely gone once I'm in gear and moving. |
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10-08-2019, 08:09 AM | #7 | |
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10-09-2019, 11:52 AM | #8 | |
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10-16-2019, 10:54 AM | #9 |
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So I had to jack the front of my car up and remove both front wheels to troubleshoot something...after a quick drive this morning, the vibration is noticeably gone. I'm starting to think its my motor mounts.
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10-16-2019, 12:25 PM | #10 |
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Interesting. My motor mounts have ~500 miles on them so I imagine I can eliminate those as a source.
I did recently have my wheels / tires balanced, which helped a bit, but it certainly didn't eliminate the issue. I'm still leaning towards flywheel, but as the clutch feels solid and I don't put a ton of miles on the car, who knows how long it will be before I crack that open and tackle that job, haha |
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10-19-2019, 08:17 PM | #11 |
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The shudder from take-off is typically indication of center-bearing wear/degradation in the drive-shaft. Of course while replacing that it would be good use of time to replace the guibo and reset service timers for the both 🙂
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10-25-2019, 09:52 AM | #12 |
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I experienced the same issue and just got started on the clutch and flywheel replacement. (Not finished yet)
I did the same thing inspected everything. The s65 depends a lot on the dual mass for balancing and if the dual mass spring are shoot it loose its balancing capabilities. Good luck
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10-25-2019, 03:19 PM | #13 | |
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Do keep us posted with how your issues are sorted out! |
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10-27-2019, 07:00 PM | #14 | ||
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I could be wrong but all research shows that the dual mass is to improve engine harmonics. It also acting as a balancer. Read up a bit on it.
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11-18-2019, 07:50 AM | #15 | |
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11-18-2019, 08:20 AM | #16 |
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Does it only happen while you are releasing the clutch? Then once fully engaged it goes away? If so, it's the clutch/flywheel. It's call clutch judder.
SAE description: "Judder is a phenomenon wherein friction induced torsional vibrations are generated in the driveline because of sliding contact between clutch and flywheel, during engagement. These resulting oscillations inherit the first resonance frequency of the driveline." Basically the flywheel/clutch engagement is no longer smooth, causing it to judder. Sometimes caused my oil or some type of fluid on the surface or it could just be wear on the flywheel causing it. Replacing the clutch/flywheel will fix that issue.
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12-04-2019, 10:29 AM | #17 | |
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03-27-2022, 11:50 AM | #19 |
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08-27-2022, 08:04 PM | #20 |
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I'd love any info regarding a fix. I have this vibration in 1st gear with a heavy throttle application. Normal pull off and there is no vibration but if I give it some juice it vibrates the center of the car. I've replaced the following with no effect on the vibration…..
1-Guibo and all hardware. 2-new center bearing. 3-New driveshaft pilot bearing. *marked splines prior to avoid unbalancing the driveshaft. 4-Engine mounts. 5-Trans mounts. 6-had rims checked for bends, cracks and balance. *No issues. 7-Harmonic balancer. 8-Dual mass flywheel (DCT) 9-Diff fluid. 10-Trans re seal w/new fluid. 9k deep and still not fixed. I really suspect the driveshaft still but the dealer says it's good. Any experience would be greatly appreciated.
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09-02-2022, 12:43 AM | #21 | |
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09-02-2022, 02:46 AM | #22 |
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