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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 05-25-2005, 11:52 PM   #1 (permalink)
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It seems that my back end when im going kinda slow like creaks like when it's going up and down and stuff

It sounds like a rumbling/vibrating sound or something and it's really random, it wont do it sometimes
also it makes this one sound that sounds like a metal bed squeeking or something
and it also does this random, and sometimes when I push on the back end of the car like it'll go up and down and make this sound



I can hear it in the rear end, it'll never do it when Im driving fast though?

it's a 93 btw 325is automatic
stock everything

102k miles

anyone know what this is?


And I have another question?
could this have anything to do with sub frame failure?
Im not exactly sure how u check for sub frame failure

or if you have sub frame failure will it always make that sound?
or what?
I mean I figured if your frame was about to fail, it'd always make that sound?

how do i check it just in case?


it seems to only make the sound after long distances, and It's really random, some days it will some days it wont?
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Old 05-26-2005, 12:56 AM   #2 (permalink)
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check your rear shock mounts. it sounds more like your shocks are shot though. jack up ur car and look at the subframe . if u think its about 2 fall off.
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Old 05-26-2005, 12:56 AM   #3 (permalink)
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my car sounds like its doing something like yours... i think its the strut mount. they're not expensive, but u have to remove the rear struts to fix em.
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Old 05-26-2005, 01:00 AM   #4 (permalink)
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Does that sound like the subframe failure though, like what it would sound like if it was my sub frame failing?

it's like a Vibrtaing/rattling noise
when I go over small bump

BUT ANSWER ME THIS?
like If it was sub frame failure thing
wouldnt it make a big noise when a went over a huge bump? or like a hill or something

cause I do......and it doesnt make the vibrating noise or any noise at all
it only does it when i go slow, over gravel or a bumpish road


I can only descirbe the noise as a Annoying metal rattle/vibrating noise

and it's kinda random too
seems to only happen over little bumps/gravel
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Old 05-26-2005, 01:24 AM   #5 (permalink)
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get a mechanic to check your spring pads. its uncommon for them to shift but they do, my friends 328 had this happen and it made large noises over bumps, and if pushed hard into corners, driving straight it was not too noticeable though.
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Old 05-26-2005, 01:29 AM   #6 (permalink)
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What are u saying it is?
does it sound like sub frame failure?
or are u saying it's the springs?


with sub frame failure it wouldnt do that just on small bumps would it?
does subframe failure make a vibrating/rattling noise? or just a clunking noise?
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Old 05-26-2005, 02:53 AM   #7 (permalink)
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ati , first of all its so hard to diagnose a noise over the internet, we can only give you possible solutions , or possible problems, im not saying its anything because the noise(s) you have described may not sound like that to me in person, and it may sound much different outside the car, and also its too vast a problem.

your best bet is to go to a pro to get the proper solution, but with the knowledge you recieve on these forums you will be a bit more informed and can use this info for future referance and maintainace.
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Old 05-26-2005, 06:12 AM   #8 (permalink)
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"get a mechanic to check your spring pads. its uncommon for them to shift but they do, my friends 328 had this happen and it made large noises over bumps, and if pushed hard into corners, driving straight it was not too noticeable though. "
you were talking about the springs though, not the subframe thing right?


and I would rather just look for myself, BUT I have no idea how to look at the subframe, I dont know where it is
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Old 05-26-2005, 06:35 AM   #9 (permalink)
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OK let me ask you this, I just went under my car
(didnt jack it up, Im very skinny lol)

and I looked at what I thought this would be?
can you Look at it without removing anything?

I looked at where the rear struts(i think) went to the top of the car to a little circular thing with 2 bolts to the side?

is that where you would check it?
or is it even possible to check and see if you have any tears or anything without removing something first?

if anyone has pictures of the place where it tears with everything still on the car, that'd definetly tell me where to look?
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Old 05-26-2005, 06:43 AM   #10 (permalink)
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A subframe problem will not make sounds... it is the frame ripping it self from itself... nothing more. Its a rip.. and if it is let to go over time... it will put more unplanned stress on other components... which will make them creak and probably sound and uneven bushing wear and tear... no sound...

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Old 05-26-2005, 07:14 AM   #11 (permalink)
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Quote:
Originally posted by 97alpineM3@May 26 2005, 06:43 AM
A subframe problem will not make sounds...* it is the frame ripping it self from itself... nothing more.* Its a rip.. and if it is let to go over time... it will put more unplanned stress on other components... which will make them creak and probably sound and uneven bushing wear and tear... no sound...

Les
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Under hard acceleration, the initial flex would probably make a metal to metal slap sound of the subframe flexing and giving due to the tears, I read this some time ago in an E36 comon probs thread. I've never experinced it but this is what I have read.
I have a simlar problem to yours, my shock mounts are probably shot.

Since you have an automatic, it's less likely to occur due to driveline stress since the torque converter eases most all of the extremely hard torque transients. With a manual, the driveline is locked with the engine's crank, and if you lock it at different RPM speeds, it causes a jolt. This is more damaing to the subframe than the way an automatic transmission functions.
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Old 05-26-2005, 07:47 AM   #12 (permalink)
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Yeah Um def dont have any metal to metal Slapping sounds, jsut that annoying vibrating/rattling noise

i noticed also that when I HIT my back seats with my hands, it kinda made the noise LOL

So what yall are saying is I should be fine right

and in case in the future I want to check, where do I look, I looked under my car, can u even see where it's ripping without taking anything out?
I saw where the struts (i thinK) went to the top, and the little bolted on circular thing attached to the frame? is that where it happens? or is it impossible to see unless u take shit off?
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Old 05-26-2005, 07:47 AM   #13 (permalink)
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yea man, dont stress about the sub frame. Odds are it has nothing to do with your problem. I called around to several BMW dealers and asked how many times they had seen the rear-sub frame issue. 8 out of 10 said none and the other two said one or two maybe and the cars were heavily moddified. In 92 and 93 cars they are more prone to it, but it is not a common thing.. I would check the suspension componets- springs, shocks & mounts, and maybe bushings and also your brake pads can come loose and rattle around on bumps (like mine is doing now)..

But to check for sub frame problems look for tears in sheet metal. To fix the problem is a pretty big to do becasue you have to drop everything in the rear end to get to the sub frame.
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Old 05-26-2005, 09:02 AM   #14 (permalink)
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Ok kool
did u just make up the dealer thing? lol the 8 out of 10 stats I mean

I looked to where my struts connected to the top of the frame, no tears or anything, or is impossible to even see the tears just by looking under your car?

if not, then I didnt see any tears so I should be in good shape
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Old 05-26-2005, 09:09 AM   #15 (permalink)
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I really did call around a few months back. I was concered as you were. I was ready to sell my car! But after furhter research- it is a problem area per say, but it isnt as common as you'd be lead to believe.. Now I have 17's, lowered, bilstein shocks and am loving it.. no signs of failure yet. Just lean back and enjoy driving the BM..
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