weird sound in the undercarriage of the car

novalauren · 04-07-2006, 08:39 PM

about 4 or 5 times I have had my car in park at a traffic light...and all of a sudden I hear this loud humming sound that vibrates my car...it seems to be coming from the back 1/3 of the vehicle and it lasts about 5 seconds...any ideas before I call the dealer and sound like a complete wacko?

it kinda sounds like I am moving my power seats...but louder and vibrates the entire car....

thanks

bos · 04-07-2006, 09:28 PM

That's the nuclear reactor.

Seriously, though, my e90 does not make weird humming sounds unless my passenger does questionable things with the stereo.

04-07-2006, 09:56 PM

Quote:

Originally Posted by bos

That's the nuclear reactor.

No,it's not .Sounds more like the afterburner to me,before releasing brakes at full power for racing.

Dizzy330i · 04-08-2006, 02:45 AM

You think it could be a problem with the comfort braking feature? Does your car have to be in park for it to happen? Or does it happen after braking a large distance or what? I can't imagine what it might be.

Sometimes when my car is cold I hear a faint rattle coming from what seems to be the catalytic. I wonder if that's normal too...

JO3 · 04-09-2006, 12:57 AM

Are you sure it came from the back of the car?

It seems like the radiator fan to me, but that would be at the front of your car.

When you're stopped for a period of time with your engine running, most cars have a radiator fan that turns on to pull air through your radiator to keep the heat down.

04-07-2006, 08:39 PM	#1
novalauren New Member 8 Rep 24 Posts Drives: 325xi Join Date: Nov 2005 Location: new jersey iTrader: (0)	weird sound in the undercarriage of the car about 4 or 5 times I have had my car in park at a traffic light...and all of a sudden I hear this loud humming sound that vibrates my car...it seems to be coming from the back 1/3 of the vehicle and it lasts about 5 seconds...any ideas before I call the dealer and sound like a complete wacko? it kinda sounds like I am moving my power seats...but louder and vibrates the entire car.... thanks __________________ alpine white-beige leather-premium package-cold weather package-steptronic
	Appreciate 0 Tweet Quote

04-07-2006, 09:28 PM	#2
bos Private 0 Rep 86 Posts Drives: 2006 330i Join Date: Mar 2006 Location: San Jose iTrader: (0) Garage List 2006 330i [0.00]	That's the nuclear reactor. Seriously, though, my e90 does not make weird humming sounds unless my passenger does questionable things with the stereo.
	Appreciate 0 Quote

04-08-2006, 02:45 AM	#4
Dizzy330i Private 6 Rep 95 Posts Drives: BMW 330i Join Date: Dec 2005 Location: Miami, FL USA iTrader: (0) Garage List 2006 330i [0.00]	You think it could be a problem with the comfort braking feature? Does your car have to be in park for it to happen? Or does it happen after braking a large distance or what? I can't imagine what it might be. Sometimes when my car is cold I hear a faint rattle coming from what seems to be the catalytic. I wonder if that's normal too... __________________ 2006 330i SG/Terra ZPP Step OEM Spoiler...and Blacklines!!
	Appreciate 0 Quote

04-09-2006, 12:57 AM	#5
JO3 Lieutenant 12 Rep 566 Posts Drives: a lot Join Date: Mar 2006 Location: CA iTrader: (8)	Are you sure it came from the back of the car? It seems like the radiator fan to me, but that would be at the front of your car. When you're stopped for a period of time with your engine running, most cars have a radiator fan that turns on to pull air through your radiator to keep the heat down.
	Appreciate 0 Quote