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      07-18-2014, 09:15 AM   #1
Osiris
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Clunky noise from rear when car is cold

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Has any one heard this before? Clunky noises from rear axel area when car is cold. Could be exhaust or deferential? It takes less than a minute to go away if I step in the gas and go faster. Then when I go slow again it's gone. Happens only when moving forward that's why I am thinking it's deferential. Any thoughts?
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      07-18-2014, 10:03 AM   #2
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i hear it too...but it only happens ONCE. I just assumed it is normal. My car has a variety of little sounds i have noticed, but none of them seem too out of the ordinary based on my searches through this forum! ha
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      07-18-2014, 10:41 AM   #3
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Are you sure this isn't the actuator that is opening or closing the valve at the rear of the exhaust? Are you both running stock BMW exhausts?

Can't remember the name of it but essentially the golf tee mod is plugging or tying this vacuum line to keep the actuator open at all times so you don't get the clunk and your exhaust is always sounding a not more aggressive and throaty. Alas I am not a pro on this as I have a straight pipe and therefore no actuator....
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      07-18-2014, 03:30 PM   #4
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Quote:
Originally Posted by Rogo View Post
Are you sure this isn't the actuator that is opening or closing the valve at the rear of the exhaust? Are you both running stock BMW exhausts?

Can't remember the name of it but essentially the golf tee mod is plugging or tying this vacuum line to keep the actuator open at all times so you don't get the clunk and your exhaust is always sounding a not more aggressive and throaty. Alas I am not a pro on this as I have a straight pipe and therefore no actuator....
This is the 1M forum mate.
Totally different axle back than the 135i
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      07-18-2014, 03:35 PM   #5
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Quote:
Originally Posted by IEDEI
i hear it too...but it only happens ONCE. I just assumed it is normal. My car has a variety of little sounds i have noticed, but none of them seem too out of the ordinary based on my searches through this forum! ha
Ya mine is gone too. But it was interesting though.
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      07-18-2014, 03:59 PM   #6
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Ah sorry my mistake haha
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      07-22-2014, 10:00 AM   #7
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I've heard this a few times, either when cold or when hot... I think it's a heat sink (the one on the diff, perhaps?) making some noise as it expands or contracts as temps change. A little annoying, but I suspect it's completely harmless.
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      07-22-2014, 12:15 PM   #8
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OK, I stand corrected... after some research, my noise is definitely this "cowbell" sound... most likely a pebble caught in the brake shield. Seems to be a common issue in E9x M3s, which I believe shares parts with the 1M.

http://www.m3post.com/forums/showthread.php?t=490597

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      07-23-2014, 11:52 PM   #9
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Quote:
Originally Posted by Plaz
OK, I stand corrected... after some research, my noise is definitely this "cowbell" sound... most likely a pebble caught in the brake shield. Seems to be a common issue in E9x M3s, which I believe shares parts with the 1M.

http://www.m3post.com/forums/showthread.php?t=490597

Yes that's the noise I heard too on mine. Thanks.
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      07-24-2014, 11:32 AM   #10
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wow, that is unusual, I never experience that with my 1M so far and its been 3 years
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      07-25-2014, 10:39 AM   #11
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It's a very common problem. Most likely a stuck pebble. Mine happened right after I drove through a short gravel driveway (never again). I took the noisy wheel off and that fixed it. Others have had the noise go away on its own.
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