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E36 M3 (1995-1999)

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  #1  
Old 07-03-2014, 03:27 PM
RainierM3 RainierM3 is offline
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Mein Auto: 1999 BMW E36 M3
Pushed my M3 too hard, hissing noise that increases with RPMs, help.

I pushed my 99 M3 pretty hard last weekend, and now I get a hissing noise like some sort of leak most of the time the car is running, and it increases with the rpms, both while in gear and while in neutral. Does anyone have any idea what it might be? HELP!
thanks
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  #2  
Old 07-07-2014, 08:56 AM
bmw-mania bmw-mania is offline
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Is hissing the only indicator?
No fluid leaks?

look for vac leaks..
inspect the intake.. rubber hoses, and boot for cracks, etc..
gently lift, and push down on the intake manifold to see if the noise increases..


ANy mods? ASC delete? etc?
Cheers!
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  #3  
Old 07-07-2014, 07:31 PM
RainierM3 RainierM3 is offline
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No leaks

I haven't found any leaks, and there is no performance loss, but my exhaust tone has changed to become more whiny and less of a throaty roar on acceleration. My thought was that perhaps something has loosened somewhere in the exhaust system, but I'm not much of a mechanic as of yet and I'm not really sure. My buddy thought I might have a cracked intake, but when I looked it up on youtube that tended to be more of a major noise change than exhaust tone and some sort of pressure leak.
Thanks
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  #4  
Old 07-07-2014, 07:32 PM
RainierM3 RainierM3 is offline
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Oh and mods.

It has a UUC Corsa exhaust system.

Last edited by RainierM3; 07-07-2014 at 07:35 PM.
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  #5  
Old 07-17-2014, 12:55 PM
bmw-mania bmw-mania is offline
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You have an exhaust leak.
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Old 07-17-2014, 01:05 PM
bimmerized bimmerized is offline
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Originally Posted by bmw-mania View Post
You have an exhaust leak.
Agreed. Go to a muffler shop to see if they can find it. It's likely one of the connectors to the CAT.
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Old 07-17-2014, 01:18 PM
bmw-mania bmw-mania is offline
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OP said he drove it hard..

Its from one of the high stress areas.. where the pipes are affixed.
Usually caused by tired motor/tranny mounts that are donut-ted, swollen, or cracked.. that have been flexing
while the powertrain is under load.
(from vibration & bending back & forth from the blown mounts.)
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  #8  
Old 07-18-2014, 10:10 AM
RainierM3 RainierM3 is offline
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Thanks

Thanks guys, that's sort of what I figured and hoped. I am gonna put it up on some ramps this evening to take a look, if I can't figure it out, looks like I'm headed to the mechanic next week haha.
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