Rattle From Back Left Of Car. - BMW Forum

benji84 · 03-09-2005, 12:58 AM

This might be a hard question to answer because it could be a couple of dif problems im sure, and i cant fully discribe the sound. But there is a light clicking... rattle sound that comes from underneith and back left. It happens everytime with bumps it stops emidiatley after bump. Its not a grown or anything like that almost sounds like somethings loose idk. I remember hearing this same sound from my moms 86 sable awhile ago. I dont know when the shocks were replaced last on this car i just got it recently from a deal and they had minimal service records. car is a 94 325is 5speed.

Furious · 03-09-2005, 03:36 AM

hmm could be a few things, first one is you might need new shock mounts, or you could have broken the tip off one of your springs, its can get caught and rattle, another thing to look at is maybe the exhaust bracket being loose? i dunno, just throwing the common things out there for you to look over.

93 325i · 03-09-2005, 08:20 AM

rear shock mount. They are prone to fail after a while. Same thing happened on mine- every bump there would be a "chinging" around sound. You'll have to remove your rear speakers and peel back the trunk lining to access the shock mounts.

CiscoKid · 03-09-2005, 09:29 AM

mine were like $20, and then you might want to replace the shocks while you are at it. You could also look into getting the urathane ones too

Cruzin 323is · 03-09-2005, 10:04 AM

did u ever think you have a baby's rattle in the back of the car??..

hahha.. just playin!

benji84 · 03-09-2005, 06:41 PM

is this a DIY job with a hayens or bently manual? Im pretty good with working on cars, i have taken my head off of my saab 2 times

. How much would shocks run me for the direct replacements. I dont think im going to be upgrading it at all, but i would be nice if it was a little stiffer.

kyle_baker · 03-10-2005, 12:15 AM

Quote:

Originally posted by 93 325i@Mar 9 2005, 08:20 AM
rear shock mount. They are prone to fail after a while. Same thing happened on mine- every bump there would be a "chinging" around sound. You'll have to remove your rear speakers and peel back the trunk lining to access the shock mounts.

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so all you have to do to correct this is to replace the rear shock mounts? mine is doing this aswell. I hope this fixes that danged aweful annoying noise. is that all you have to do tho?

Furious · 03-10-2005, 03:45 AM

try an upgrade, i go the GC (ground control) shock mounts and i love them, also they last a lot longer than conventional shock mounts, i have a FAQ on them somewhere.

93 325i · 03-10-2005, 07:55 AM

I got heavy duty mounts that claim they are lifetime-Bimmerworld.com, they were like $35.00. Check out the FAQ section on this site under maintience and there is a good write-up with pics.. I got heavy duty bilstein shocks from bavauto for $85.00 a piece. So in all to do mounts and shocks in the rear it will cost from $150-$200 depending on what shocks you get..

robbins6103 · 03-10-2005, 01:11 PM

Check your bumper mounts as well, thats where I was having a slight rattling over bumps. Sometimes the bolts come loose under there. You can see them if you look under the bumper, there's 2 of them the screw up into the 2 bumper mounts.

Gomerino · 03-10-2005, 01:46 PM

I have a light rattle in my rear-drivers side, not sure what it is....think it might be that vacuum plate behind the rotor....it's really annoying, especially since I've replaced/upgraded all my shocks, springs, shock mounts, subframe bushings, bumper mounts........the sound is kind of tinny; like a bolt vibrating in a soup can...

benji84 · 03-10-2005, 04:13 PM

Quote:

Originally posted by Gomerino@Mar 10 2005, 11:46 AM
I have a light rattle in my rear-drivers side, not sure what it is....think it might be that vacuum plate behind the rotor....it's really annoying, especially since I've replaced/upgraded all my shocks, springs, shock mounts, subframe bushings, bumper mounts........the sound is kind of tinny; like a bolt vibrating in a soup can...

[snapback]308083[/snapback]

perfect discription, that is exactly one of the sounds im hereing on my rear-drivers side also. I cant replicate the sound by pusing on rear of car, only happens when driving, the smallest little bump will make it rattle.

///M3 · 03-10-2005, 04:52 PM

I've just fixed the same thing on mine...

I was about to get the trailing arm bushes and rear top mounts changed when....

I checked around the wheel and brake caliper... I fumbled around and found some foam (sponge) sticking out from the back of the caliper.

I checked further and pulled it out. Mmmm I thought, why was that there? I drove the car again and sure enough the rattle had got worse.

When I pulled up to a traffic light on my way home I realised that under breaking (lightly) the sound disappeared.... try this on yours; drive down a bumpy street and just press the brake lightly... if it stops you know it's brake related.

Took apart the caliper and found that the pads were rattling; that explained why they stopped when they were squeezed against the disc!

Got some bonding agent (high-heat glue) and stuck them in place (on advice from mechanic).

Rattle gone!

benji84 · 03-10-2005, 05:02 PM

Quote:

Originally posted by ///M3@Mar 10 2005, 02:52 PM
I've just fixed the same thing on mine...

I was about to get the trailing arm bushes and rear top mounts changed when....

I checked around the wheel and brake caliper... I fumbled around and found some foam (sponge) sticking out from the back of the caliper.

I checked further and pulled it out. Mmmm I thought, why was that there? I drove the car again and sure enough the rattle had got worse.

When I pulled up to a traffic light on my way home I realised that under breaking (lightly) the sound disappeared.... try this on yours; drive down a bumpy street and just press the brake lightly... if it stops you know it's brake related.

Took apart the caliper and found that the pads were rattling; that explained why they stopped when they were squeezed against the disc!

Got some bonding agent (high-heat glue) and stuck them in place (on advice from mechanic).

Rattle gone!

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Thanks / / /M3 ill check that out today on my way home from work. What type of glue did you end up using? Was the foam used for keeping presure on the brake pad and caliper, sort of a cousin?

TMac325is · 03-10-2005, 05:15 PM

exhaust mounts would be my guess