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      04-20-2013, 10:51 AM   #1
Majin Buu

Drives: M3
Join Date: Apr 2013
Location: Canada

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M3 weird groaning sound

Hi. I have a 2008 E90 M3 sedan, manual, edc with nav/idrive. Had it for a bit over a year now. A few months ago in winter I began to notice a weird groaning sound. It only occurs when the engine rpm is about 1700 to 2000 rpm. Doesn't matter if the car is moving or not, or if the tranny is in gear or neutral. It happens whether the engine is revving up or revving down. It happens on a regular basis when I start the car up when it's cold. But after about 5-10 min of driving the sound goes away. You can see it at the 10, 23, 28, 39, 53, and 64 second mark here and at the 9, 12, 20, 30, 35, and 38 second mark here. Any thoughs on the cause of this? I'm thinking exhaust leak, but I checked under the car with the engine off and there doesn't appear to be any visible damage or rust to it. It's the stock exhaust.
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      04-20-2013, 11:23 AM   #2
2018 track days - 0 ridge 1:52:24 pacific 1:33:30
1MOREMOD's Avatar

Drives: Race car->
Join Date: Mar 2009
Location: check your mirrors

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try getting under it with it running. i had to do this to track down an annoying vibration that ended up being the midpipe touching the crossmember. aftermarket though.

02 Tiag e46 M3|6MT|GC plates|MCS c.o.|GC bars|GC race control arms|GC bushings|BW eng. & tran. mounts|subframe kit|BW race shifter|BW Jaffster|Euro header|BW exhaust|K&N c.a.i.|Epic race tune|Rouge pulleys|Seibon CF hood|CSL bumper|apr gt 250 & splitter|ST-40|XR-2|SS lines|half cage|Recaro profi|Profi 2 harness|BMWpedals|BW studs|
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