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BMW 3-Series (E90 E92) Forum
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Hunting a Rattlesnake (NOW WITH VIDEO!!)
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04-08-2024, 03:05 PM | #1 |
Second Lieutenant
53
Rep 218
Posts |
Hunting a Rattlesnake (NOW WITH VIDEO!!)
Join me in my journey to find a rouge rattler coming from the rear half of the car.
Car set-up: 2011 E90 335i Fortune-Auto 500 series coilovers (recently refreshed) Spherical bearings replaced for the trailing arms M3 rear control arms Bimmerworld adjustable toearms solid aluminum subframe bushings Condor Speed shop UHMW diff bushings powerflex poly inner spring arm bushings Napa special solid rubber upper shock mount Turner MS lower spherical shock mount The rear end is solid and there is some additional NVH but there is a rattle back there that sounds like a warped 1x6 board bouncing around an empty truck bed, when going over rough roads at slower speeds. I have torqued and marked just about every control arm bolt, drive shaft bolt, exhaust mount, heat shield nut, etc. I checked the rear coilovers as I originally suspected a blown shock (hit a huge pothole a year ago and notice it start to sweat fluid) so I preventatively replaced both rear shocks. I am putting this out there in case anyone has experienced anything else coming loose. I recently saw that FCP-Euro is selling an aluminum bracket for the rear parking brake as the plastic mount can fail and cause some noise, which is what got me thinking about posting this. Last edited by andreu12qw; 05-03-2024 at 08:24 PM.. |
05-03-2024, 07:18 PM | #2 |
Second Lieutenant
53
Rep 218
Posts |
Update
Update:
Took the car to a local show for a friend to check it out and to confirm what I was hearing. He was confident it was the rear driver side shock. I re-checked the pre-load on the rear coilovers, Swapped out the top mounts for stock lemforder shock mounts and re-torqued everything. Even with all of this the noise is still there. Below is a link to the sound. |
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05-03-2024, 11:25 PM | #3 |
Captain
350
Rep 603
Posts |
beside tugging/prying to verify tightness underneath (exhaust, suspension, shields), i would put someone in the trunk and maybe u can feel where the rattle coming from
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05-05-2024, 02:27 PM | #4 | |
Second Lieutenant
53
Rep 218
Posts |
Quote:
Thanks for the input! that will be my next step. I tried banging a rubber mallet, prying on arms, etc etc.. |
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05-06-2024, 01:06 PM | #5 |
Colonel
1030
Rep 2,719
Posts
Drives: e92 + f15
Join Date: Jan 2012
Location: Cambridge, MA
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Nice susp setup.
Nothing moving around in the battery or amp areas? Or any sockets/tools or something near the top mounts? No play in the adj toe arms, right? |
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05-09-2024, 09:48 AM | #6 |
Second Lieutenant
53
Rep 218
Posts |
Checked the battery clamp, no loose tools, and just had an alignment so the toe arms are tight as they were checked while I was there.
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