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BMW 3-Series (E90 E92) Forum
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Suspension noise over rolling bumps
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02-25-2013, 12:57 PM | #1 |
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Suspension noise over rolling bumps
Over the last few weeks I've noticed a metallic "kachunk" noise when driving over low-frequency bumps. These bumps have been a combination of rolls in poorly maintained roads, entries into driveways and ice ruts. It's happened at speeds between 10 and 40 mph, and as I'm rolling over a bump, the suspension makes a creaky, metalic thump sort of noise - almost like it's fully unloading the springs on the backside of the bump. It's not a knocking noise as far as I can tell.
In the last several months, prior to hearing this, I had hit several ice-ridges on local freeways at 65-70 mph that were severe enough to bottom out the suspension and induce profuse swearing. Not sure if there's a direct connection, although those impacts probably can't be good for the car. Anyone else have this? Should I be concerned? Car has 51k on it. Thanks. |
02-25-2013, 02:54 PM | #2 |
just another bmw douche bag
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check the strut top nuts.. might not be the problem, but it's a really easy fix if it is. Make sure they are tightned down all the way.
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02-26-2013, 07:36 AM | #3 |
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I had a similar problem. Turned out to be a sway-bar end link.
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02-26-2013, 09:53 AM | #4 |
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Thanks for the input guys. I'll take a look at the strut tops, and check the sway-bar, as well.
B.Corso - was it an issue of the link being loose and needing to be tightened, or actually failing? |
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02-26-2013, 10:09 AM | #5 |
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The link is a 6 inch long rod between the sway bar (mounted above the rear axle) and the suspension. It is unlikely to come loose and it is very common that it wears out.
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