E90Post
 


 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Weird noise from engine bay



Reply
 
Thread Tools Search this Thread
      02-17-2009, 07:02 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
Appreciate 0
      02-18-2009, 12:44 AM   #2
sd390r
Lieutenant Colonel
sd390r's Avatar
United_States
61
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
Appreciate 0
      02-18-2009, 10:20 AM   #3
louie_perm
Private First Class
United_States
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.
Appreciate 0
      02-18-2009, 10:32 AM   #4
hun77777
Brigadier General
hun77777's Avatar
United_States
197
Rep
4,647
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...
Appreciate 0
      02-18-2009, 11:28 AM   #5
cn555ic
cn555ic's Avatar
United_States
441
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
Appreciate 0
      02-18-2009, 12:45 PM   #6
stressdoc
Moderator
stressdoc's Avatar
Dominica
616
Rep
10,854
Posts

Drives: BMW i8; Toy 4runner TRD pro
Join Date: Jun 2005
Location: Waco TX

iTrader: (0)

It's possessed. Get it exorcised.
Appreciate 0
      02-18-2009, 02:04 PM   #7
louie_perm
Private First Class
United_States
17
Rep
142
Posts

Drives: *
Join Date: Feb 2009
Location: *

iTrader: (0)

You could try dropping a little Beano in the tank.
Appreciate 0
      02-19-2009, 03:14 AM   #8
Nexus-6
Private First Class
10
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.
Appreciate 0
      02-19-2009, 07:33 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.
Appreciate 0
      02-19-2009, 07:48 PM   #10
cn555ic
cn555ic's Avatar
United_States
441
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!
Appreciate 0
      02-19-2009, 08:52 PM   #11
Sniz
Lieutenant General
Sniz's Avatar
648
Rep
10,587
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.
__________________
Appreciate 0
      02-19-2009, 08:56 PM   #12
cn555ic
cn555ic's Avatar
United_States
441
Rep
18,331
Posts

Drives: 335i
Join Date: Jun 2007
Location: US

iTrader: (6)

Quote:
Originally Posted by Sniz View Post
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!!!
Appreciate 0
      02-20-2009, 05:46 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....
Appreciate 0
      02-20-2009, 08:08 PM   #14
cn555ic
cn555ic's Avatar
United_States
441
Rep
18,331
Posts

Drives: 335i
Join Date: Jun 2007
Location: US

iTrader: (6)

Quote:
Originally Posted by Gator Freighter2 View Post
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!!!
Appreciate 0
      02-20-2009, 08:13 PM   #15
Nexus-6
Private First Class
10
Rep
170
Posts

Drives: '07 BMW 335i
Join Date: Dec 2006
Location: Wherever there is hockey

iTrader: (1)

Garage List
2007 335i  [0.00]
Quote:
Originally Posted by cn555ic View Post
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.
Appreciate 0
      02-21-2009, 12:41 AM   #16
sd390r
Lieutenant Colonel
sd390r's Avatar
United_States
61
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
Appreciate 0
      09-21-2009, 09:35 AM   #17
JVFan
Lieutenant
JVFan's Avatar
35
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
Appreciate 0
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 06:50 PM.




e90post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST