E90Post
 


TNT Racewerks
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Mystery Vac Leak



Reply
 
Thread Tools Search this Thread
      10-07-2018, 10:55 PM   #1
Savage520
Enlisted Member
Savage520's Avatar
United_States
3
Rep
31
Posts

Drives: 2007 BMW 328i Sedan
Join Date: May 2018
Location: Tucson, AZ

iTrader: (0)

Mystery Vac Leak

Hey was wondering if any of you guys could tell me what this leak is and which parts I'm going to need to replace? Any help is appreciated
Attached Images
   
Appreciate 0
      10-08-2018, 01:31 PM   #2
triax37
Private First Class
23
Rep
122
Posts

Drives: 2007 BMW 328i, E91
Join Date: Oct 2016
Location: Denver, CO

iTrader: (1)

Pretty sure that's the PCV valve which is built into the $400 valve cover of 2007-2012 E90 N52 engines. Bumping to the top so that someone else can confirm...
Appreciate 1
      10-08-2018, 06:47 PM   #3
Savage520
Enlisted Member
Savage520's Avatar
United_States
3
Rep
31
Posts

Drives: 2007 BMW 328i Sedan
Join Date: May 2018
Location: Tucson, AZ

iTrader: (0)

Quote:
Originally Posted by triax37 View Post
Pretty sure that's the PCV valve which is built into the $400 valve cover of 2007-2012 E90 N52 engines. Bumping to the top so that someone else can confirm...
Thank you, I was planning on changing the valve cover gasket and eccentric shaft sensor with the set from ECS..... should I just order a whole new cover with the gaskets???
Appreciate 0
      10-14-2018, 05:57 AM   #4
juld0zer
Major
312
Rep
1,069
Posts

Drives: E82 135i 7DCT
Join Date: Jul 2016
Location: 2153

iTrader: (0)

Correct, someone has elbowed the nipple and broken it off. Normally there is a cap on it, but not an airtight cap.
Are you having any issues that prompted the in depth look or did it just make a lot of noise?
Appreciate 1
      10-14-2018, 06:12 AM   #5
Savage520
Enlisted Member
Savage520's Avatar
United_States
3
Rep
31
Posts

Drives: 2007 BMW 328i Sedan
Join Date: May 2018
Location: Tucson, AZ

iTrader: (0)

Quote:
Originally Posted by juld0zer View Post
Correct, someone has elbowed the nipple and broken it off. Normally there is a cap on it, but not an airtight cap.
Are you having any issues that prompted the in depth look or did it just make a lot of noise?
I actually did a smoke test on the engine because I was getting lean codes on both banks. That led me to this. But I could hear a high pitched whistle when raising rpms too. So replacing the valve cover should remedy it? I'm planning on changing the eccentric shaft sensor too as I found some oil there.
Appreciate 0
      10-16-2018, 05:36 AM   #6
juld0zer
Major
312
Rep
1,069
Posts

Drives: E82 135i 7DCT
Join Date: Jul 2016
Location: 2153

iTrader: (0)

Another member went into quite a bit of detail about the PCV system, albeit on an N55 turbo engine but there is some relevant info or concepts there.

If you had a constant stream of smoke escaping this barb then I'd say you've found the cause. The diaphragm is leaking and making the noise. You could of course plug it with your fingertip and see if that affects idling behaviour to confirm your finding.
Appreciate 1
      10-16-2018, 07:25 AM   #7
Savage520
Enlisted Member
Savage520's Avatar
United_States
3
Rep
31
Posts

Drives: 2007 BMW 328i Sedan
Join Date: May 2018
Location: Tucson, AZ

iTrader: (0)

Quote:
Originally Posted by juld0zer View Post
Another member went into quite a bit of detail about the PCV system, albeit on an N55 turbo engine but there is some relevant info or concepts there.

If you had a constant stream of smoke escaping this barb then I'd say you've found the cause. The diaphragm is leaking and making the noise. You could of course plug it with your fingertip and see if that affects idling behaviour to confirm your finding.
My question is will the leak be remedied by a new valve cover and gaskets? Is the diaphragm built into the new valve cover?
Trying to gather a list of all the parts I'll need to repair everything.
So far it's a new valve cover and gaskets,
ofh gasket (saw a little oil there)
eccentric shaft sensor and gasket (saw a little oil there and it leaked a little in the smoke test)

Am I missing anything?? Are there any gaskets that are likely to break in the VC job? One time use screw, things of that nature?
Also thanks so much for your help man. Do you think we could arrange a phone call and I'll buy you a beer/blunt over Apple Pay or somethin? I'm trying to get my baby back in shape as soon as possible and haven't found too much help so I'd be willing to compensate someone who knows more than I about these engines for their time.
Appreciate 0
      10-18-2018, 06:40 AM   #8
PichaDis11
Lieutenant Colonel
PichaDis11's Avatar
United_States
182
Rep
1,933
Posts

Drives: E90 N52
Join Date: Mar 2013
Location: NY

iTrader: (3)

Seems you are getting all gaskets with a new valve cover. Order this vent tube 11157559528 for the intake connection. Those plastics do get a little brittle overtime with heat cycles etc. The one I had cracked when I attempted to disconnect.

Good wrenching.
__________________
...
Appreciate 1
      10-18-2018, 02:45 PM   #9
desertman123
E82 Mudflap Ambassador
desertman123's Avatar
United_States
1316
Rep
1,558
Posts

Drives: '08 128i
Join Date: May 2016
Location: Orlando, FL

iTrader: (0)

Garage List
2008 BMW 128i  [5.00]
2014 BMW 528i  [5.00]
https://vanos-bmw.com/product/111275...-n51-n52n-n52k
__________________

My 2008 128i - Sparkling Graphite/Beige - Sport pkg - 6MT - Click me!
Parents' 2014 528i - Mineral White/Ivory White - fully loaded
Instagram @Andreys_128i
Appreciate 1
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 04:53 AM.




e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2018, 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