E90Post
 


ECS BMW
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Wierd "vacuum" sound after BOV DIY



Reply
 
Thread Tools Search this Thread
      07-13-2012, 11:36 AM   #1
E90Company
Major General
E90Company's Avatar
No_Country
72
Rep
6,137
Posts

 
Drives: Car
Join Date: Mar 2012
Location: FL

iTrader: (2)

Wierd "vacuum" sound after BOV DIY

Hey guys,

I did the DIY "BOV" by unplugging the DV hose just to see what it would sound like. I only did the front one, and drove around a bit to hear it, then came home to plug it all back up. Now the issues begin. First, I noticed ALOT of oil had been spit out of the DV hose, probably just normal blow-by. The real issue is I now hear this wierd sound when I let off the throttle after boosting: it isn't a blow off sound, more like a sucking sound that is hard to describe. I honestly think it might be compressor surge

Then, I go to read codes, and I find 2 codes popped up: 2ABC and 3100. At this point I am extremely pissed off. My mods are JB4 and DCI, never been off map 1. I cleared the codes and drove hard for a little, they didn't come back, but the sound is still there. Here is a low quality phone video of the sound, that you can hear towards the end when letting off throttle. Please help!

http://s1241.photobucket.com/albums/...=VIDEO0007.mp4
Appreciate 0
      07-13-2012, 11:37 AM   #2
onebadmofo
Banned
Russian Federation
54
Rep
2,394
Posts

 
Drives: 2007 E92 335i
Join Date: Aug 2010
Location: Central NJ

iTrader: (14)

Sounds like a boost leak, check all the connections.
Appreciate 0
      07-13-2012, 11:40 AM   #3
E90Company
Major General
E90Company's Avatar
No_Country
72
Rep
6,137
Posts

 
Drives: Car
Join Date: Mar 2012
Location: FL

iTrader: (2)

I forgot to note the codes popped up after I switched into JB4 map 8, thinking with the turbos "off" I couldn't hear it. The noise didn't occur in this map. Also, the car seems to be holding boost fine, I think..
Appreciate 0
      07-13-2012, 11:44 AM   #4
onebadmofo
Banned
Russian Federation
54
Rep
2,394
Posts

 
Drives: 2007 E92 335i
Join Date: Aug 2010
Location: Central NJ

iTrader: (14)

If you have a small leak the the turbos will be able to hold the boost, you're just overworking them.
Appreciate 0
      07-13-2012, 11:44 AM   #5
benzy89
Banned
United_States
28
Rep
2,396
Posts

 
Drives: '08 E90 335i
Join Date: Jan 2012
Location: Northern NJ

iTrader: (3)

Garage List
2008 BMW 335i  [3.75]
I'm gonna pretend to be surprised that something went wrong with your "budget" DIY BOV
Appreciate 0
      07-13-2012, 11:44 AM   #6
E90Company
Major General
E90Company's Avatar
No_Country
72
Rep
6,137
Posts

 
Drives: Car
Join Date: Mar 2012
Location: FL

iTrader: (2)

Quote:
Originally Posted by Andrey@AutoCouture View Post
If you have a small leak the the turbos will be able to hold the boost, you're just overworking them.
What do you think I should be checking first?
Appreciate 0
      07-13-2012, 11:45 AM   #7
onebadmofo
Banned
Russian Federation
54
Rep
2,394
Posts

 
Drives: 2007 E92 335i
Join Date: Aug 2010
Location: Central NJ

iTrader: (14)

Quote:
Originally Posted by E90Company View Post
What do you think I should be checking first?
Whatever you were plugging-unplugging. DV connections especially.
Appreciate 0
      07-13-2012, 11:49 AM   #8
E90Company
Major General
E90Company's Avatar
No_Country
72
Rep
6,137
Posts

 
Drives: Car
Join Date: Mar 2012
Location: FL

iTrader: (2)

Quote:
Originally Posted by Andrey@AutoCouture View Post
Whatever you were plugging-unplugging. DV connections especially.
What should I be looking for specifically? I disconnected where the dv connects to the intake piping. Shouldn't that not affect it?
Appreciate 0
      07-13-2012, 12:17 PM   #9
benzy89
Banned
United_States
28
Rep
2,396
Posts

 
Drives: '08 E90 335i
Join Date: Jan 2012
Location: Northern NJ

iTrader: (3)

Garage List
2008 BMW 335i  [3.75]
I'm sorry, but how do you have almost 2,700 posts & not know more?
Appreciate 0
      07-13-2012, 12:20 PM   #10
E90Company
Major General
E90Company's Avatar
No_Country
72
Rep
6,137
Posts

 
Drives: Car
Join Date: Mar 2012
Location: FL

iTrader: (2)

Quote:
Originally Posted by benzy89 View Post
I'm sorry, but how do you have almost 2,700 posts & not know more?
What am I not knowing here? Boost leak codes never showed up, and the car seems to be holding boost. I just hear a different sound heard in the vid.
Appreciate 0
      07-13-2012, 12:22 PM   #11
benzy89
Banned
United_States
28
Rep
2,396
Posts

 
Drives: '08 E90 335i
Join Date: Jan 2012
Location: Northern NJ

iTrader: (3)

Garage List
2008 BMW 335i  [3.75]
That it was pretty stupid to unplug the OEM DVs..... Should've just bought a used CP + BOV if you wanted to change it that badly
Appreciate 0
      07-13-2012, 12:24 PM   #12
rader1
Banned
34
Rep
2,197
Posts

 
Drives: Cobb Stage 2+ 135i
Join Date: Apr 2011
Location: Roanoke, VA

iTrader: (0)

Quote:
Originally Posted by E90Company View Post
What am I not knowing here? Boost leak codes never showed up, and the car seems to be holding boost. I just hear a different sound heard in the vid.
What tune are you running? Do a datalog and pay close attention to your WGDC. If you have a boost leak the WGDCs willl be very "spikey" and constantly trending upward
Appreciate 0
      07-13-2012, 12:27 PM   #13
E90Company
Major General
E90Company's Avatar
No_Country
72
Rep
6,137
Posts

 
Drives: Car
Join Date: Mar 2012
Location: FL

iTrader: (2)

Quote:
Originally Posted by rader1 View Post
What tune are you running? Do a datalog and pay close attention to your WGDC. If you have a boost leak the WGDCs willl be very "spikey" and constantly trending upward
The JB4. I guess I am going to have to log it
Appreciate 0
      07-13-2012, 12:51 PM   #14
E90Company
Major General
E90Company's Avatar
No_Country
72
Rep
6,137
Posts

 
Drives: Car
Join Date: Mar 2012
Location: FL

iTrader: (2)

Does the video sound like I am leaking?
Appreciate 0
      07-13-2012, 01:07 PM   #15
Beemw335
Colonel
29
Rep
2,016
Posts

 
Drives: 335i
Join Date: Mar 2011
Location: My car is my home

iTrader: (2)

Just go pull on the dv and make sure its well put in. It needs to br locked into place.
If it is, then just drive around and look for codes.
Appreciate 0
      07-13-2012, 01:49 PM   #16
rader1
Banned
34
Rep
2,197
Posts

 
Drives: Cobb Stage 2+ 135i
Join Date: Apr 2011
Location: Roanoke, VA

iTrader: (0)

Quote:
Originally Posted by E90Company View Post
Does the video sound like I am leaking?
To be honest, I can't really hear anything. It's supposed to make a "whoosh" sound. As long as the DV is secure in the CP and the intake is capped and nothing else is disturbed then you should be good. Make sure canclear on the JB4 is off so that if there is a boost leak then it will show up as a 30FF code.
Appreciate 0
      07-13-2012, 02:04 PM   #17
#Tee
Chronic trollololer level 60
#Tee's Avatar
77
Rep
4,876
Posts

 
Drives: yes
Join Date: Oct 2011
Location: Socal

iTrader: (1)

goin by the sounds of that vid, everything sounds normal. Do a vid of the hood opened and rev it up
__________________

#TeamStretchNpoke IG:Tee212

custom cf rear side diffuser add ons for sale (e9x,M3s,f3x) pm me for details. thread http://www.e90post.com/forums/showthread.php?t=962442
Appreciate 0
      07-13-2012, 04:00 PM   #18
E90Company
Major General
E90Company's Avatar
No_Country
72
Rep
6,137
Posts

 
Drives: Car
Join Date: Mar 2012
Location: FL

iTrader: (2)

Verdict of the story:

Codes were thrown due to switching into map 8, which is known to throw these codes on a JB4.

All lines were tight etc, noise is still there but it's normal.

/thread
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
Forum Jump


All times are GMT -5. The time now is 07:58 AM.




e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
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