"Humming noise" from the rear of the car

natedog7700 · 11-01-2014, 12:51 PM

Not every time but almost always (and has been getting slightly worse the past 10k miles) Every time I floor it at 2,000rpms or less I can hear a deep "hum" like sound coming from the rear. It only happens WOT below 2K rpms. Its a very faint "hum" so im not sure where to even start on diagnosing since there really is no other symptoms other than the humming below 2k at WOT. it... Anybody ever have this problem?
112,000 miles and climbing!

allstar335is · 04-13-2015, 09:20 PM

iv been getting the same humming noises from my 2011 335is from the rear cabin and always happens around 2k rpm and climbing and will usually cut off at 2.5k rpm or 3k rpm depending on the gear im on. have you been able to diagnois your problem?

Efthreeoh · 04-14-2015, 05:26 AM

Fat chick stuck in the back seat? Haven't noticed her?

StealYourFace · 04-14-2015, 05:54 AM

Does it change with steering inputs? Rear wheel bearing?

natedog7700 · 04-14-2015, 09:40 PM

Quote:

Originally Posted by allstar335is

iv been getting the same humming noises from my 2011 335is from the rear cabin and always happens around 2k rpm and climbing and will usually cut off at 2.5k rpm or 3k rpm depending on the gear im on. have you been able to diagnois your problem?

Exactly! No I haven't BUT I must say, it is nowhere near as bad anymore since getting it out of storage. I did a few maintenance things over storage one of them being diff fluid. I could not drain it (save that for another day) but I put in 1/4 quart because it was low and now it doesn't do it nearly as easy. Maybe if I actually drain the diff fluid and fill with fresh fluid, (115,000 miles) it would stop completely. How many miles are on your car?

natedog7700 · 04-14-2015, 09:41 PM

Quote:

Originally Posted by Efthreeoh

Fat chick stuck in the back seat? Haven't noticed her?

Ha! No fat chicks here..

natedog7700 · 04-14-2015, 09:43 PM

Quote:

Originally Posted by StealYourFace

Does it change with steering inputs? Rear wheel bearing?

No because it only happens WOT in a straight line UNDER 2,500-3k RPMs.

11-01-2014, 12:51 PM	#1
natedog7700 Captain 658 Rep 780 Posts Drives: 07 335i RB's 625whp Join Date: Nov 2013 Location: milwaukee wi iTrader: (0)	"Humming noise" from the rear of the car Not every time but almost always (and has been getting slightly worse the past 10k miles) Every time I floor it at 2,000rpms or less I can hear a deep "hum" like sound coming from the rear. It only happens WOT below 2K rpms. Its a very faint "hum" so im not sure where to even start on diagnosing since there really is no other symptoms other than the humming below 2k at WOT. it... Anybody ever have this problem? 112,000 miles and climbing!
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04-13-2015, 09:20 PM	#2
allstar335is Private 6 Rep 57 Posts Drives: 335is Join Date: Feb 2015 Location: toronto iTrader: (0)	iv been getting the same humming noises from my 2011 335is from the rear cabin and always happens around 2k rpm and climbing and will usually cut off at 2.5k rpm or 3k rpm depending on the gear im on. have you been able to diagnois your problem?
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04-14-2015, 05:26 AM	#3
Efthreeoh General 17309 Rep 18,733 Posts Drives: The E90 + Z4 Coupe & Z3 R'ster Join Date: May 2012 Location: Virginia iTrader: (0)	Fat chick stuck in the back seat? Haven't noticed her? __________________ A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission. "Yeah, but NO ONE puts an automatic trans shift knob on a manual transmission."
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04-14-2015, 05:54 AM	#4
StealYourFace Lieutenant Colonel 261 Rep 1,794 Posts Drives: F30 328i M 6mt, E36 M3 Join Date: Jul 2009 Location: Shakedown Street, Buffalo NY iTrader: (1)	Does it change with steering inputs? Rear wheel bearing? __________________
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