Weird ooh or wooooh sound from car.

toksis · 09-15-2018, 06:52 AM

Hello Guys, My E90 N46 engine has a strange sound. What could this oooh sound be? Thanks.

https://www.youtube.com/watch?v=zcAnALdOm5s

nsjames · 09-15-2018, 10:41 AM

does it change with RPM?

I had an oil filter cause a screeching noise on my n52.
and any sort of slight intake/pcv leak will cause noises like that.

you need to pnpoint where the noise comes from.

toksis · 09-16-2018, 05:59 AM

During high revs, the woooh sound also increase frequency pitch becomes high.

high rev

I also noticed when I start the car by pressing the start button without pressing the brake. I hear a high frequency sound and it will only stop after a loud plastic clang. I also recorded it here.

whistle sound

What could this sounds be?

nsjames · 09-16-2018, 09:53 AM

again, you need to pinpoint the component making the sound, or at least narrow it down to a general area in the engine bay using mechanics stethoscope or a screwdriver.

there are multiple possibilities.

toksis · 09-17-2018, 04:15 AM

I will check how to do that sthetoscope thingy. thanks

toksis · 11-17-2018, 12:44 AM

Hello, I bought a stethoscope and discovered where the sound is.

It is very high on the inlet manifold and not so high in the engine itself where the manifold is attached. I also put the stethoscope in the DISA valve or parts near it I can hear the high frequency sound.

I also attached some pictures for further clarification.

https://ibb.co/mCVJn0

https://ibb.co/dbSL0L

09-15-2018, 06:52 AM	#1
toksis New Member 1 Rep 6 Posts Drives: e90 2006 Join Date: Sep 2018 Location: auckland iTrader: (0) Garage List 2006 320i e90 [0.00]	Weird ooh or wooooh sound from car. Hello Guys, My E90 N46 engine has a strange sound. What could this oooh sound be? Thanks. https://www.youtube.com/watch?v=zcAnALdOm5s
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09-15-2018, 10:41 AM	#2
nsjames Brigadier General 2463 Rep 4,328 Posts Drives: 08 328xi Touring Join Date: May 2017 Location: ohio iTrader: (0)	does it change with RPM? I had an oil filter cause a screeching noise on my n52. and any sort of slight intake/pcv leak will cause noises like that. you need to pnpoint where the noise comes from.
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09-16-2018, 05:59 AM	#3
toksis New Member 1 Rep 6 Posts Drives: e90 2006 Join Date: Sep 2018 Location: auckland iTrader: (0) Garage List 2006 320i e90 [0.00]	During high revs, the woooh sound also increase frequency pitch becomes high. high rev I also noticed when I start the car by pressing the start button without pressing the brake. I hear a high frequency sound and it will only stop after a loud plastic clang. I also recorded it here. whistle sound What could this sounds be? Last edited by toksis; 09-16-2018 at 06:42 AM..
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09-16-2018, 09:53 AM	#4
nsjames Brigadier General 2463 Rep 4,328 Posts Drives: 08 328xi Touring Join Date: May 2017 Location: ohio iTrader: (0)	again, you need to pinpoint the component making the sound, or at least narrow it down to a general area in the engine bay using mechanics stethoscope or a screwdriver. there are multiple possibilities.
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09-17-2018, 04:15 AM	#5
toksis New Member 1 Rep 6 Posts Drives: e90 2006 Join Date: Sep 2018 Location: auckland iTrader: (0) Garage List 2006 320i e90 [0.00]	I will check how to do that sthetoscope thingy. thanks
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11-17-2018, 12:44 AM	#6
toksis New Member 1 Rep 6 Posts Drives: e90 2006 Join Date: Sep 2018 Location: auckland iTrader: (0) Garage List 2006 320i e90 [0.00]	Hello, I bought a stethoscope and discovered where the sound is. It is very high on the inlet manifold and not so high in the engine itself where the manifold is attached. I also put the stethoscope in the DISA valve or parts near it I can hear the high frequency sound. I also attached some pictures for further clarification. https://ibb.co/mCVJn0 https://ibb.co/dbSL0L
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