Weird noise from engine bay

Gator Freighter2 · 02-17-2009, 08:02 PM

Ok, I searched and did see one post on this noise from 11/08, but no vid and no resolution. Anyway, after the car is off for about 45-60 minutes this weird screeching noise happens intermittently from the left front of the engine. I'll send these vids along to the dealer in hopes of them knowing what it is without me leaving my car there for days, or weeks. Here's some links to the videos, any thought are definitely welcome:

Vid #1

Vid #2

sd390r · 02-18-2009, 01:44 AM

What the fuck is that??? lol

You didn't wanna just get a tripod instead of standing there for 45 minutes?

That shit sounds funny, not trying to be disrespectful

please tell us what it is, my car never made that noise

louie_perm · 02-18-2009, 11:20 AM

I don't know what that is--let me say it up front. But, if I had to guess, I'd say it is some type of valve letting off pressure as the engine cools--perhaps a thermostat or radiator cap. Don't know much about the various valves associated with the turbos.

hun77777 · 02-18-2009, 11:32 AM

i actually heard that during my jb3 install and battery was disconnected so i don't know how that happened...

cn555ic · 02-18-2009, 12:28 PM

i hear it all the time after i the engine is on and I do some work under the motor...definitely some kind of pressure release , don't know where its coming from but it there! normal if you ask me

stressdoc · 02-18-2009, 01:45 PM

It's possessed. Get it exorcised.

louie_perm · 02-18-2009, 03:04 PM

You could try dropping a little Beano in the tank.

Nexus-6 · 02-19-2009, 04:14 AM

Ha! I've heard the same thing...scared the bejesus out of me the first time it happened as I was leaning down swapping my DVs back in (spring change).

It only happens after the car has been sitting for about 30+ minutes...it sounds almost electrical in nature...or somewhat like a high pressure release/leak (think : letting the air out of a highly inflated balloon a tiny bit at at time).

I never managed to trace it. It sounds like it's coming from the alternator to me, though that makes zero sense. I can safely rule out the charge pipe as I had my diverter valves out when it happens (zero pressure there). Radiator cooling off/fluid return from the overflow tank? Close proximity there to the top hose. Fuel return? Fuel pump depressurizing? Dunno at this point but glad to hear that someone else has heard this bizarre sound too.

Gator Freighter2 · 02-19-2009, 08:33 PM

Well, I suppose it's good not to be the only person in the boat. I'll hit up my service manager again and see if he'll send it to the engineers for a view. I find it highly unlikely they've not heard it and don't know what it is since there is more than one person out there...Problem being they like to keep this intermittent crap secret for some reason.

cn555ic · 02-19-2009, 08:48 PM

I hear it everytime I have the car on, then turn off the car to mess with the engine....Happens everytime...to me it sounds like everyone has experienced this....answering where its coming from, CLUELESS!

Sniz · 02-19-2009, 09:52 PM

never heard that one before and my head has been buried in the engine bay for countless hours. Maybe I just ignored it, this car makes all types of weird noises.

cn555ic · 02-19-2009, 09:56 PM

Quote:

Originally Posted by Sniz

never heard that one before and my head has been buried in the engine bay for countless hours. Maybe I just ignored it, this car makes all types of weird noises.

well the noise recorded by the OP is amplified because of the microphone, its really not that loud, almost sounds like someone passing gas/ fart!!!

Gator Freighter2 · 02-20-2009, 06:46 PM

You're correct about the level of the audio, if the hood is closed, you have to have your head right next to the grill to hear it. I don't think it much of an issue because if it was I'm sure my car would have blown up by now....

cn555ic · 02-20-2009, 09:08 PM

Quote:

Originally Posted by Gator Freighter2

You're correct about the level of the audio, if the hood is closed, you have to have your head right next to the grill to hear it. I don't think it much of an issue because if it was I'm sure my car would have blown up by now....

IF you and I are the only one hearing this, then it would be a problem, but I heard it from the first day I brought the car home admiring the engine bay and I heard this gas screeching noise and heard it ever since...You have to realize alot of people shut their cars off and leave it alone, I usually shut the car off and mess with the engine, check it all mods are okay, clean the engine etc!!!

Nexus-6 · 02-20-2009, 09:13 PM

Quote:

Originally Posted by cn555ic

IF you and I are the only one hearing this, then it would be a problem, but I heard it from the first day I brought the car home admiring the engine bay and I heard this gas screeching noise and heard it ever since...You have to realize alot of people shut their cars off and leave it alone, I usually shut the car off and mess with the engine, check it all mods are okay, clean the engine etc!!!

+1

After any new tweak, I'm always under the hood checking things out and this usually happens 10 to 30 minutes after a drive. It won't happen if the car has been sitting an hour. Sounds pretty normal based on the feedback received here.

sd390r · 02-21-2009, 01:41 AM

shit, ive never heard my car make any noise like that

JVFan · 09-21-2009, 10:35 AM

Did you get any resolution? That sound is exactly what I heard this weekend...a lot!

02-17-2009, 08:02 PM	#1
Gator Freighter2 New Member 0 Rep 14 Posts Drives: 2008 335i Join Date: Jan 2008 Location: Las Cruces, NM iTrader: (0) Garage List 2008 335i [0.00]	Weird noise from engine bay Ok, I searched and did see one post on this noise from 11/08, but no vid and no resolution. Anyway, after the car is off for about 45-60 minutes this weird screeching noise happens intermittently from the left front of the engine. I'll send these vids along to the dealer in hopes of them knowing what it is without me leaving my car there for days, or weeks. Here's some links to the videos, any thought are definitely welcome: Vid #1 Vid #2
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02-18-2009, 01:44 AM	#2
sd390r Lieutenant Colonel 62 Rep 1,654 Posts Drives: AW M3 Join Date: Aug 2008 Location: North Jersey iTrader: (9) Garage List 2008 E90 335i [0.00]	What the fuck is that??? lol You didn't wanna just get a tripod instead of standing there for 45 minutes? That shit sounds funny, not trying to be disrespectful please tell us what it is, my car never made that noise __________________ 2008 E90 M3 - Sold 2006 Evo IX SE - Sold 2008 E90 335i - Sold
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02-18-2009, 11:20 AM	#3
louie_perm Private First Class 17 Rep 142 Posts Drives: * Join Date: Feb 2009 Location: * iTrader: (0)	I don't know what that is--let me say it up front. But, if I had to guess, I'd say it is some type of valve letting off pressure as the engine cools--perhaps a thermostat or radiator cap. Don't know much about the various valves associated with the turbos.
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02-18-2009, 11:32 AM	#4
hun77777 Brigadier General 199 Rep 4,646 Posts Drives: SG E92 Join Date: Nov 2007 Location: Seattle WA iTrader: (58)	i actually heard that during my jb3 install and battery was disconnected so i don't know how that happened...
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02-18-2009, 12:28 PM	#5
cn555ic 460 Rep 18,331 Posts Drives: 335i Join Date: Jun 2007 Location: US iTrader: (6)	i hear it all the time after i the engine is on and I do some work under the motor...definitely some kind of pressure release , don't know where its coming from but it there! normal if you ask me
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02-18-2009, 01:45 PM	#6
stressdoc Moderator 656 Rep 10,863 Posts Drives: BMW i8; Toy 4runner TRD pro Join Date: Jun 2005 Location: Waco TX iTrader: (0)	It's possessed. Get it exorcised. __________________ My recent ED photos: http://f80.bimmerpost.com/forums/sho....php?t=1026808 my not-so-recent ED: http://www.e90post.com/forums/showthread.php?t=31829 Please join BMWCCA http://bmwcca.org/index.php?pageid=c...&ref_by=300279
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02-18-2009, 03:04 PM	#7
louie_perm Private First Class 17 Rep 142 Posts Drives: * Join Date: Feb 2009 Location: * iTrader: (0)	You could try dropping a little Beano in the tank.
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02-19-2009, 04:14 AM	#8
Nexus-6 Private First Class 11 Rep 170 Posts Drives: '07 BMW 335i Join Date: Dec 2006 Location: Wherever there is hockey iTrader: (1) Garage List 2007 335i [0.00]	Ha! I've heard the same thing...scared the bejesus out of me the first time it happened as I was leaning down swapping my DVs back in (spring change). It only happens after the car has been sitting for about 30+ minutes...it sounds almost electrical in nature...or somewhat like a high pressure release/leak (think : letting the air out of a highly inflated balloon a tiny bit at at time). I never managed to trace it. It sounds like it's coming from the alternator to me, though that makes zero sense. I can safely rule out the charge pipe as I had my diverter valves out when it happens (zero pressure there). Radiator cooling off/fluid return from the overflow tank? Close proximity there to the top hose. Fuel return? Fuel pump depressurizing? Dunno at this point but glad to hear that someone else has heard this bizarre sound too.
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02-19-2009, 08:33 PM	#9
Gator Freighter2 New Member 0 Rep 14 Posts Drives: 2008 335i Join Date: Jan 2008 Location: Las Cruces, NM iTrader: (0) Garage List 2008 335i [0.00]	Well, I suppose it's good not to be the only person in the boat. I'll hit up my service manager again and see if he'll send it to the engineers for a view. I find it highly unlikely they've not heard it and don't know what it is since there is more than one person out there...Problem being they like to keep this intermittent crap secret for some reason.
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02-19-2009, 08:48 PM	#10
cn555ic 460 Rep 18,331 Posts Drives: 335i Join Date: Jun 2007 Location: US iTrader: (6)	I hear it everytime I have the car on, then turn off the car to mess with the engine....Happens everytime...to me it sounds like everyone has experienced this....answering where its coming from, CLUELESS!
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02-19-2009, 09:52 PM	#11
Sniz Lieutenant General 679 Rep 10,584 Posts Drives: e92 335 - gone // e36 M3 turbo Join Date: Mar 2007 Location: Ellicott City, MD iTrader: (1)	never heard that one before and my head has been buried in the engine bay for countless hours. Maybe I just ignored it, this car makes all types of weird noises. __________________
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02-20-2009, 06:46 PM	#13
Gator Freighter2 New Member 0 Rep 14 Posts Drives: 2008 335i Join Date: Jan 2008 Location: Las Cruces, NM iTrader: (0) Garage List 2008 335i [0.00]	You're correct about the level of the audio, if the hood is closed, you have to have your head right next to the grill to hear it. I don't think it much of an issue because if it was I'm sure my car would have blown up by now....
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02-21-2009, 01:41 AM	#16
sd390r Lieutenant Colonel 62 Rep 1,654 Posts Drives: AW M3 Join Date: Aug 2008 Location: North Jersey iTrader: (9) Garage List 2008 E90 335i [0.00]	shit, ive never heard my car make any noise like that __________________ 2008 E90 M3 - Sold 2006 Evo IX SE - Sold 2008 E90 335i - Sold
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09-21-2009, 10:35 AM	#17
JVFan Lieutenant 36 Rep 515 Posts Drives: Very Well Join Date: Jun 2005 Location: Lloydminster, AB CANADA iTrader: (1)	Did you get any resolution? That sound is exactly what I heard this weekend...a lot! __________________ 2012 328i White Luxury/ Saddle Brown
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