small High pitch sound...what is it?

ssabripo · 11-24-2008, 05:42 PM

last few days I noticed that my car starts to make this somewhat faint yet audible high pitch tone, specially after a few runs above 4k rpm. I muted the radio, and I can hear it but can't pin point where is coming from.

I opened the windows and doesn't seem like its coming from the outside/engine bay of the car. Looks more and more like within the AC/fan system.

anyone heard of this issue or has experienced this?:iono:

AlienDNA · 11-24-2008, 05:48 PM

You're sure you're not hearing the turbos?

ssabripo · 11-24-2008, 05:55 PM

Quote:

Originally Posted by AlienDNA

You're sure you're not hearing the turbos?

since when were the turbos audible? NEVER did I hear them before...:iono:

ExMX5 · 11-24-2008, 05:57 PM

Could be the fuel pump

lambammm · 11-24-2008, 06:02 PM

Quote:

Originally Posted by ssabripo

since when were the turbos audible? NEVER did I hear them before...:iono:

you haven't heard your turbos? wow.

ssabripo · 11-24-2008, 06:02 PM

Quote:

Originally Posted by ExMX5

Could be the fuel pump

that was my first thought, but when I opened the windows, I couldn't hear it. But I will double check again.

dammit, i hope is not the FP's

ssabripo · 11-24-2008, 06:04 PM

Quote:

Originally Posted by lambammm

you haven't heard your turbos? wow.

no. why is that strange? i would have heard them since day one.

AlienDNA · 11-24-2008, 06:06 PM

Quote:

Originally Posted by ssabripo

since when were the turbos audible? NEVER did I hear them before...:iono:

Seriously? I have no problem hearing them with the stereo off. They're not intrusive, quite subtle, but they're there. And, yes, it's the turbos - I can hear them dispose of boost off-throttle.

But, then, I can tell the difference in a half-pound of tire pressure on the track, so maybe I'm overly sensitive.:iono:

If the high-pitched sound goes up and down with speed, it's probably something electrical. But if you hear it and it quits when you suddenly cut the power, you're probably just hearing the turbo whine.

ssabripo · 11-24-2008, 06:12 PM

Quote:

Originally Posted by AlienDNA

If the high-pitched sound goes up and down with speed, it's probably something electrical. But if you hear it and it quits when you suddenly cut the power, you're probably just hearing the turbo whine.

it doesn't go up and down with speed per se, but if I'm at a stop I hear it, but when I engage 1st gear and start to go, it goes lower...once I pick speed, it goes back up.

AlienDNA · 11-24-2008, 06:21 PM

Quote:

Originally Posted by ssabripo

it doesn't go up and down with speed per se, but if I'm at a stop I hear it, but when I engage 1st gear and start to go, it goes lower...once I pick speed, it goes back up.

If you hear it idling at a stop, it probably isn't the turbos - they're pretty much doing nothing at that point. It sounds electrical - do you get it if you kill power to the radio? Do you have iDrive?

Midgad · 11-24-2008, 06:36 PM

Think that happens right b4 you break the sound barrier!

BMWDMD · 11-24-2008, 07:34 PM

I hear all sorts of high pitched sounds from my car. Especially when a CD is in the car, whether or not it is playing. It is NOT the turbos or fuel pump, because it also occurs when the car is off.

There are also bugs within the door gong/seatbelt chimes. Sometimes they just cut out before finishing the sound.

Annoying, but I don't really see how they would fix these things.

ssabripo · 11-24-2008, 08:42 PM

Quote:

Originally Posted by AlienDNA

If you hear it idling at a stop, it probably isn't the turbos - they're pretty much doing nothing at that point. It sounds electrical - do you get it if you kill power to the radio? Do you have iDrive?

no, when car is off, it's gone. Yes I do have iDrive.

Quote:

Originally Posted by BMWDMD

I hear all sorts of high pitched sounds from my car. Especially when a CD is in the car, whether or not it is playing.

one interesting point: i just started using the CD player yesterday (only iPod, etc, before), so it could be the CD...i will check in the morning

Mega Man · 11-24-2008, 10:10 PM

Does it happen around 88 MPH? Is your flux capacitor malfunctioning?

morgie2 · 11-25-2008, 09:00 AM

Quote:

Originally Posted by Mega Man

Does it happen around 88 MPH? Is your flux capacitor malfunctioning?

Could be a case of bad plutonium.

creepy coupe · 11-25-2008, 09:14 AM

I hear some kind of pump/motor running even when I only run the engine for a minuet

lannypoffo · 11-25-2008, 09:53 AM

Quote:

Originally Posted by Creepy Coupe

I hear some kind of pump/motor running even when I only run the engine for a minuet

i hear the circulation pump noise too. when idling. prob just oil or water circulation.

jeremyc74 · 11-25-2008, 10:03 AM

Quote:

Originally Posted by ssabripo

last few days I noticed that my car starts to make this somewhat faint yet audible high pitch tone, specially after a few runs above 4k rpm. I muted the radio, and I can hear it but can't pin point where is coming from.

I opened the windows and doesn't seem like its coming from the outside/engine bay of the car. Looks more and more like within the AC/fan system.

anyone heard of this issue or has experienced this?:iono:

Try pressing the re-circlulation button on the HVAC controls and see if it goes away. My car has an issue with the re-circ flap not opening properly sometimes, and it causes a whistling noise at speed when it's pulling in outside air. Turning it back to re-circulation mode gets rid of it instantly. The button also does nothing when the A/C compressor is turned on, so that may be an additional symptom to look for. I'm taking it in to have the dealer look at it in early December, I'll report back once I do.

creepy coupe · 11-25-2008, 10:13 AM

Quote:

Originally Posted by lannypoffo

i hear the circulation pump noise too. when idling. prob just oil or water circulation.

The noise I was refering to is when at rest.

tnawab · 11-25-2008, 10:16 AM

OK. I have this noise and there was a big discussion on this a while back.

If the noise sounds like its from the Dash (passenger side) then its the water pump. Its a known issue, and it makes noise, like a high pitch hum almost. It will come on when Idle and when driving. You just cant hear it when driving because the engine noise is louder.

The 3 series has the same issue. Its not a problem, just there by design. They didnt do a good job padding it out.

Let me know if thats the sound. It should sound like a high pitch motor sound. If so, its the water pump.

tnawab · 11-25-2008, 10:27 AM

Mayeb this will help: http://www.1addicts.com/forums/showt...ght=water+pump

ssabripo · 11-25-2008, 11:57 AM

Quote:

Originally Posted by tnawab

OK. I have this noise and there was a big discussion on this a while back.

If the noise sounds like its from the Dash (passenger side) then its the water pump. Its a known issue, and it makes noise, like a high pitch hum almost. It will come on when Idle and when driving. You just cant hear it when driving because the engine noise is louder.

The 3 series has the same issue. Its not a problem, just there by design. They didnt do a good job padding it out.

Let me know if thats the sound. It should sound like a high pitch motor sound. If so, its the water pump.

that;s it EXACTLY!

so, from your post and link, sounds like it is the Fuel pump design, and doesn't need replacing. Is this correct? :iono:

11-24-2008, 05:42 PM	#1
ssabripo HALA MADRID! 940 Rep 2,879 Posts Drives: camels & donkeys Join Date: Jul 2005 Location: Plantation, Fl iTrader: (7)	small High pitch sound...what is it? last few days I noticed that my car starts to make this somewhat faint yet audible high pitch tone, specially after a few runs above 4k rpm. I muted the radio, and I can hear it but can't pin point where is coming from. I opened the windows and doesn't seem like its coming from the outside/engine bay of the car. Looks more and more like within the AC/fan system. anyone heard of this issue or has experienced this?:iono: __________________ F87 M2 Competition, Sunset Orange, Exc, DCT. SOLD F80 M3 Mineral Grey/Sakir Orange, Exc, DCT... ED 6/2015 SOLDE90 M3, Interlagos Blue / M individual two-tone, ZCP, ZP2, ZCV, DCT, ED.
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11-24-2008, 05:48 PM	#2
AlienDNA Second Lieutenant 4 Rep 280 Posts Drives: 2008 135i LeMans Blue Join Date: Oct 2008 Location: Margaritaville iTrader: (0)	You're sure you're not hearing the turbos? __________________ ~~~~~~~~~~~~~~~~~~~~~~~~~~ 2008 135i Performance suspension, exhaust, grilles, front bumper, skirts, shift kit, spoiler. M3 front control arms, rear subframe bushings. Cobb'd.
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11-24-2008, 05:57 PM	#4
ExMX5 Engineering Tool 5 Rep 152 Posts Drives: Join Date: Aug 2008 iTrader: (0)	Could be the fuel pump __________________ 135i M-sport Convertible <> Monaco Blue, Lemon Interior, Brushed Al Trim, Black Rag, Hi-Fi, Pro Nav, Front/Rear PDC, BMW Performance SSK Due December 15th!
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11-24-2008, 06:36 PM	#11
Midgad Free Skier 28 Rep 439 Posts Drives: 128i Coupe, 6MT, M-Sports Join Date: Aug 2008 Location: LI,NY iTrader: (0)	Think that happens right b4 you break the sound barrier!
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11-24-2008, 07:34 PM	#12
BMWDMD New Member 0 Rep 7 Posts Drives: Join Date: Jun 2008 iTrader: (0)	I hear all sorts of high pitched sounds from my car. Especially when a CD is in the car, whether or not it is playing. It is NOT the turbos or fuel pump, because it also occurs when the car is off. There are also bugs within the door gong/seatbelt chimes. Sometimes they just cut out before finishing the sound. Annoying, but I don't really see how they would fix these things.
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11-24-2008, 10:10 PM	#14
Mega Man エアーマンが倒せない 278 Rep 2,041 Posts Drives: 2009 135i Join Date: Oct 2008 Location: SoCal iTrader: (7) Garage List 2009 135i [0.00]	Does it happen around 88 MPH? Is your flux capacitor malfunctioning?
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11-25-2008, 09:14 AM	#16
creepy coupe Lieutenant General 1868 Rep 13,043 Posts Drives: BMW M340I G20 Join Date: Aug 2007 Location: UK iTrader: (2) Garage List 2015 BMW 435d [0.00] 2009 335i [0.00]	I hear some kind of pump/motor running even when I only run the engine for a minuet
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11-25-2008, 10:16 AM	#20
tnawab Private First Class 11 Rep 187 Posts Drives: 135i Graphite, Coral Red Join Date: May 2008 Location: Ottawa, ON iTrader: (0)	OK. I have this noise and there was a big discussion on this a while back. If the noise sounds like its from the Dash (passenger side) then its the water pump. Its a known issue, and it makes noise, like a high pitch hum almost. It will come on when Idle and when driving. You just cant hear it when driving because the engine noise is louder. The 3 series has the same issue. Its not a problem, just there by design. They didnt do a good job padding it out. Let me know if thats the sound. It should sound like a high pitch motor sound. If so, its the water pump.
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11-25-2008, 10:27 AM	#21
tnawab Private First Class 11 Rep 187 Posts Drives: 135i Graphite, Coral Red Join Date: May 2008 Location: Ottawa, ON iTrader: (0)	Mayeb this will help: http://www.1addicts.com/forums/showt...ght=water+pump
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