New rsm's didn't do the job

[TJsBimm]

Thanks I'll try that out. But it even made the sound without any throttle, just rolling slightly. It drives me nuts I tell ya NUTS.

[Dudesky]

You check your heat shield by the cats? That is notorious for disintegrating, and when it's loose it causes that metallic rattling, or what I think Catalyst was referring to as "rocks in a can". Even at idle.

[TJsBimm]

Originally Posted by Dudesky_E36

You check your heat shield by the cats? That is notorious for disintegrating, and when it's loose it causes that metallic rattling, or what I think Catalyst was referring to as "rocks in a can". Even at idle.

Ya I've had to tie it up a few times already. Thanks I'll take a look

[catalyst]

Originally Posted by Dudesky_E36

Here's what was causing my problem back then . . . The catback pipes was missing a hanger, and was off to the side slightly, causing the pipe to scrape against the hanger tab in the middle of the car. But because the pipes resonated the sound throughout the whole exhaust system, it was difficult to pinpoint where the sound was originating from. I could swear it was coming from the rear, but it was actually coming from under the tranny hump. And the noise would only occur over bumps and when making right turns. The exhaust didn't look loose at all, and it was hard to wiggle it around, but I guess the forces are greater when hitting bumps and turning. It sounded like torn metal or the sound when you scrape the threads of a bolt on a metal edge. So I thought it might be a subframe mount, or a rear bushing. Then one day I banged my knee against the tailpipe really hard (ouch), and there was the sound! That's why I say move your pipes around somewhat forcefully, even if you think they're pretty solid.

Dude that is totally what my problem is i bet, i ripped off the midsection hanger because it was rusted to shit and didnt even look like it was doing anything, but i guess it was.. ima have to secure the midsection somehow i guess.

[SHAHAB323IS]

you guys are going to laugh, but i noticed something on the way home from school today, NO NOISES, lol yup, i didn't notice any noise when going over bumps, also i was all happy and when i walked in to my house and looked at the clock it said 3:23 so i'm thinking the bmw gods were on my side , but yeah i don't know what happened, i doubt whatever was wrong miraculously fixed itself, but who knows i'll see if it stays noise free, thanks all of those who tried to help

[nick_318is]

I think there is a good posibility that you will hear from the noise again.

[94bmw325i]

Have you tried just revving it up while idling?

[B3M2W5i]

check it just to be sure

[Storamin]

Originally Posted by nick_318is

I think there is a good posibility that you will hear from the noise again.

x2

[SHAHAB323IS]

Originally Posted by 94bmw325i

Have you tried just revving it up while idling?

wtf?


and yeah i think it will return too

[Numark318i]

hm my e30 has the same symtoms...im still trying to figure it out. I have been told many things..and so far none have been the problem. Im changin my rear shock mounts..cause i think they might be the problem.
tell me when u firgure it out.
im checking my exhaust also.

[94bmw325i]

Originally Posted by SHAHAB323IS

wtf?


and yeah i think it will return too

When I revved up my car to around 3500 I found out that the exhaust hanger was loose, and I thought that could be a symptom for your noise.

[RealBmw 02]

Originally Posted by Storamin

x2

x3



I too had the problem with my exhaust hitting my car and making a horrid rattling noise. It would happen whenever one wheel would loose and then regain grip (no LSD on my car). I had no idea what it was until one day when my car was on the lift in shop class and some kid was f-ing around with my exhaust. I was pissed that it took so long to figure out, but glad that I had found the little gremlin.

[Chris]

take it to a dealer and let them deal with it?

[catalyst]

Originally Posted by chrisdoesntknow

take it to a dealer and let them deal with it?