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2010 2011 BMW 5 Series Forum F10 Loud/Nasty rattle when going over bumps |
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08-30-2010, 10:17 PM | #1 |
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Loud/Nasty rattle when going over bumps
Was wondering if anyone else is getting the same sound/problem as me.
When I go over bumps, when the front wheel hits it, it's perfectly fine but when the back wheels hit it I get a loud nasty rattle. The bumps honestly aren't big bumps and any other car I've had/driven, was never a big deal (just a thud sound/or a little rattle). And to test it out I drove my bro's car which is a lot stiffer then mine (M45 with 19inch wheels + stiffer tires + springs + sport suspension) on the same roads/bumps. It does not even get close to the sound I get when my rear wheels hit the bump and on his car I just get a regular thud sound, no crazy rattle. Tried to put it in comfort mode as well and it doesn't really seem to help. I've got the dynamic handling + sport package. Can't pinpoint exactly where it is coming from. I'm wondering if it has to do with either the sunshades on the doors/rear or because the rear is a multilink suspension |
08-30-2010, 10:33 PM | #2 |
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Drives: '23 i4 M50, '15 M3, '18 911
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I haven't noticed any rattle. Is this at a higher speed, like hitting a bump in the road? Or is it when going over a curb at low speed? Maybe there's something bad going on in the rear of your car. Like a wheel, suspension, or bearing problem.
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08-30-2010, 10:35 PM | #3 |
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No rattle with mine when going over bumps as you've described.
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08-30-2010, 10:39 PM | #4 |
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Ive had this happen a couple of times in my car, 550i with sport package the dynamic ride control. On sudden depressions where the car just "drops" the front seems to step down normally but the rear seems to slam down as if the rear suspension firms up super hard. Ive noticed this does not happen with I switched to comfort on the same road, same road irregularity but I plan to get this checked out anyway. Ill post back if something comes up.
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08-30-2010, 11:31 PM | #5 |
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Had a 3 series with the sport package and it did the same thing that you are describing, it was mostly due to the lower position in the suspension. since you live in NJ I suspect that it is like here in NY, many bumps and pot holes. I dont have that problem now with the new F10. I wanted the comfy ride after a couple of mishaps with the afforementioned 3. Might be something else but I think its just the sport suspension....
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08-31-2010, 06:39 AM | #7 | ||
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Looks like I may have to get it checked out. |
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09-02-2010, 06:42 PM | #8 |
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I do get that thud on sudden depressions of the road. It feels like the springs fully compressing due to lack of dampening. I do not have any rattles though
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09-03-2010, 04:48 AM | #10 |
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I've read this type of rear suspension thump/crash exists in the 5GT and testers have shown it up as the 'weakness' in the suspension/ride comfort balance.
My own take, the rear spring rate (possibly too stiff) for some imperfections and run-flats get out of phase, or hit the wrong frequency in some situations, another negative for run-flats, IMO. Result... it amplifies rather than surpress some road imperfections. BTW, it happened on my 330 before I removed the run-flats, doesn't do it on normal tires. HighlandPete |
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09-03-2010, 06:11 AM | #11 |
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Must say that, this noise occurs especially when the suspension is set to comfort mode.
Is like car senses that the front wheel has hit a pothole and then hardens shock rear suspension for not to be as violent whet hit it but is noisy like something is breaking over there. |
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09-03-2010, 06:49 AM | #12 |
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Over the weekend I just switched over to non run-flat Michelin Pilot A/S Sport Plus and I haven't heard that nasty noise yet.
Gonna have to drive a bit more to really see the results. But overall first impression is that it is much better than the Good Years. I wonder if BMW engineers intended for the cars to be running on RFT because the ride got much better. |
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09-04-2010, 04:56 AM | #13 |
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I had a similar sound. I found it was the smaller sun shades on the rear doors. The retract unit was loose. I extended the smaller sun shades to put tension on the spring rewind component. The sound went away.
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09-04-2010, 08:59 AM | #14 | |
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I prefer to keep it down because I have my windows tinted. |
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09-08-2010, 03:19 PM | #16 | |
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Seems like it is the sunshade, or that or the tires that I switched to are soaking up the bumps better. |
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09-08-2010, 05:41 PM | #17 |
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I do not have folding rear seats either. The vertical sunshades retract unit (for the smaller sunshades) seem to move up and down a few millimeters. That was enough travel to make them rattle when going over a bump without any tension.
Last edited by 5ster; 09-08-2010 at 05:58 PM.. |
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12-01-2010, 12:30 AM | #18 |
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I get the same noise from my 2011 528i, it is a massively loud thump that only comes from the rear when i ride over the slightest bumps or into the slightest of troughs. It sounds as if the rear wheels are going to break off the car.
After some testing I figured out why it happens much more often in comfort mode. The thump is not caused when the suspension contracts, it happens when the rear suspension expands to its maximum; which explains why in sport mode, which doesn't allow for much expansion and contraction, the sound is not as common. The whole of the 5 series owner community in Egypt has this problem. I figured that it was an Egyptian assembly flaw (which it still could be) but now I see this post and I'm rethinking it. Then again, this is the only post I've seen on the matter from abroad and it doesn't seem nearly as extreme as it is with our locally assemble vehicles. |
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