E90Post
 


Bimmer Retrofit
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > vacuum line fix - low boost, underboost, 30ff, wastegate rattle



Reply
 
Thread Tools Search this Thread
      06-18-2011, 06:14 PM   #1
mattsfeir
Lieutenant
 
Drives: 335xi
Join Date: Oct 2009
Location: CO

Posts: 444
iTrader: (1)

vacuum line fix - low boost, underboost, 30ff, wastegate rattle

Here's a quick vacuum line fix that solved a lot of problems for me. My car's boost kept getting lower and lower, ultimately ended up around 3psi when it should have been 13.5psi. I made a boost leak tester which showed me one boost leak, but even when that was fixed, the boost level didn't change. I was getting the 30FF error code under full throttle and the wastegates really started rattling, sounded like diesel clatter.

Robert at Vishnu spent some time on the phone diagnosing the issue and said I should check all the vacuum lines, especially the ones right by the oil filter (red arrow in pic below). He also mentioned that right after shutting the car off, immediately disconnect the vacuum connector (blue arrow in pick below) and I should hear a whoosh of air being sucked in due to the vacuum. They had this same issue with a beta tester's car.

One of my vacuum lines had split right behind the oil filter, found the leak by disconnecting the vacuum connector and blowing air into it with my mouth. While that may sound weird, it was very easy to find the leak. Replaced both of the original vacuum lines with the 5/32 line from Pep Boys and all was fixed. There was vacuum when I shut the car off and boost is now back to normal.

My car is an 07 with 54k miles, as more of these cars get older and the heat from the oil filter takes it toll on the rubber lines, I'd guess more people will have this issue.

I had an appt scheduled with the dealer the next day to diagnose this, not sure what they would have charged, but I'd guess $100-$200 and the line cost $5 at Pep Boys. Great service from Vishnu giving me tips on fixing a hardware issue, Procede had nothing to do with this.

Edit: Probably best to cut the old vacuum lines off as they may be brittle and stuck to the plastic connectors. I used a utility knife to slice the ends of the old vacuum lines open (parallel to the line), then they're easy to peel off the plastic connectors. Also note that you could have a vacuum leak somewhere else besides this spot, this just appears to be a common spot.
Attached Images
  
__________________
2007 335xi 6AT / Vishnu Procede V5 / Vishnu DCI / Vishnu Meth kit (PWM) / AR Catless downpipes / Borla racing pipes with Magnaflow muffler / Borla exhaust system / AMS intercooler

Best 1/4 time = 12.975 @ 107.15, 1.763 60' at Bandimere Speedway (5800' above sea level)

Last edited by mattsfeir; 06-19-2011 at 08:13 PM.
mattsfeir is offline   United_States
0
Reply With Quote
      06-18-2011, 06:22 PM   #2
Sparky66
Major
 
Sparky66's Avatar
 
Drives: 335 E92 Coupe. Jet Black.
Join Date: Feb 2007
Location: Sydney, Australia

Posts: 1,232
iTrader: (0)

Great information...........should be a sticky
__________________
Sticky is an Idiot
Sparky66 is offline   Australia
0
Reply With Quote
      06-18-2011, 06:26 PM   #3
Ilma
Colonel
 
Drives: BMW
Join Date: Nov 2008
Location: hometown

Posts: 2,542
iTrader: (0)

Great tip....thanks for that

Who would have thought that part could impact your boost pressure. But given that the vacuum cannisters control the wastegates - it kind of makes sense.

What other systems does that line provide vacuum for?

Sometimes on a cold start, my brake pedal will feel stone hard until the car starts and then it softens back to normal within a second. I think that is because of a loss of vacuum in that particular line you pointed out.
__________________
Sticky is an idiot
Ilma is offline  
0
Reply With Quote
      06-18-2011, 06:51 PM   #4
EastBayE90
Formerly (-(ellblazer420
 
EastBayE90's Avatar
 
Drives: 2007 E90 335i M/T
Join Date: Sep 2010
Location: SF East Bay, CA

Posts: 703
iTrader: (0)

Garage List
Yup I'm the beta tester they discovered this issue on. My car would not make more than 4 psi when I dropped it off to them for the PWM meth kit install. A great easy fix. My car has only 49K on it. I strongly recommend replacing both lines to anyone who has around 50K miles or more. I bet so many have blamed their tune when it was just these lines that needed to be replaced.
__________________

(410whp 445ft/lbs | DCI + Meth Only)
OpenFlash OTS Stage 1 Flash | Vishnu PWM Meth Kit | Vishnu DCI| Forge DVs
EastBayE90 is offline   United_States
0
Reply With Quote
      06-18-2011, 11:12 PM   #5
s2k_335i
This is it!!
 
s2k_335i's Avatar
 
Drives: FBO 335i without meth
Join Date: Jul 2010
Location: Land of Freedom

Posts: 672
iTrader: (1)

Thanks for the info. I'll replace these when i have a chance even thought I don't have any boost leak.
__________________
DFW, TX. Current: 08' Cayenne GTS, 14' Boxster S, 12' CBR 1000', 04' Bayliner 2556
Sold: 2010 A4, 2008 335i, 2007 335i, 2006 M3, 2006 S2000, 1990 NSX, 1991 300zx, 1992 Supra, 1996 Prelude, 1981 CRX, 1980 Mustang.
s2k_335i is offline   No_Country
0
Reply With Quote
      06-18-2011, 11:28 PM   #6
WOPALX
Lieutenant Colonel
 
WOPALX's Avatar
 
Drives: 335i Sedan
Join Date: May 2007
Location: Sydney, Australia

Posts: 1,993
iTrader: (2)

Had the same issue at about 60,000klms, dealer replaced them under warranty.
__________________
Vishnu PROcede V5 | VK Motorworks FMIC | AR Design OCC | Forge DV's | Bilstein PSS9 | M3 Lower Control Arms & Caster Rods | Quaife LSD | HiTech Exhaust | BMW Performance Illuminated Door Sills | BMW Performance Gear Selector & Boot | BMW Performance E-Brake Cover
WOPALX is offline   Australia
0
Reply With Quote
      06-19-2011, 12:38 PM   #7
Palisades
Private
 
Drives:
Join Date: Mar 2008

Posts: 74
iTrader: (2)

Do you have to take the engine cover off to access this?
Palisades is offline  
0
Reply With Quote
      06-19-2011, 12:57 PM   #8
EastBayE90
Formerly (-(ellblazer420
 
EastBayE90's Avatar
 
Drives: 2007 E90 335i M/T
Join Date: Sep 2010
Location: SF East Bay, CA

Posts: 703
iTrader: (0)

Garage List
Quote:
Originally Posted by Palisades View Post
Do you have to take the engine cover off to access this?
Yes
__________________

(410whp 445ft/lbs | DCI + Meth Only)
OpenFlash OTS Stage 1 Flash | Vishnu PWM Meth Kit | Vishnu DCI| Forge DVs
EastBayE90 is offline   United_States
0
Reply With Quote
      06-19-2011, 01:09 PM   #9
trickcruiser
First Lieutenant
 
Drives: E82
Join Date: Jun 2010
Location: Cincinnati, OH

Posts: 388
iTrader: (1)

Great info!
Thank you for taking the time to share with pix.
__________________
G5 ISO | BMS Flash | Alpina Flash | RB Turbos | RPI Quad Exhaust | AR ******* DP's
Meth DO 14 | Walbro E85 | E60 | AA FMIC | ER CP W/Synapse BOV
503whp/517wtq - Best ET: 11.44 | Best MPH 126.3 | Street Tires
trickcruiser is offline   United_States
0
Reply With Quote
      06-19-2011, 03:02 PM   #10
Palisades
Private
 
Drives:
Join Date: Mar 2008

Posts: 74
iTrader: (2)

I'm having a hard time getting the vacuum connector off. Is there some trick to disconnecting it?
Palisades is offline  
0
Reply With Quote
      06-19-2011, 07:52 PM   #11
Palisades
Private
 
Drives:
Join Date: Mar 2008

Posts: 74
iTrader: (2)

Well I managed to screw this up. I broke the plastic tap at the red arrow when I was trying to get the hose off. My hoses were incredibly brittle and basically fused to the plastic. Now what? I guess I have to go to the dealer tomorrow morning.
Palisades is offline  
0
Reply With Quote
      06-19-2011, 07:59 PM   #12
aleckzandr
Major
 
aleckzandr's Avatar
 
Drives: 2009 n54 e92 xi, 6mt, kw v3
Join Date: Sep 2009
Location: Colorado, USA

Posts: 1,303
iTrader: (0)

Garage List
2009 335xi  [4.22]
Absolutely great info Matt. Thanks.
__________________
KWs - Vorshlags - APEX EC-7s - "My garage" has suspension install pictures.
_____________________
aleckzandr is offline   United_States
0
Reply With Quote
      06-19-2011, 08:09 PM   #13
mattsfeir
Lieutenant
 
Drives: 335xi
Join Date: Oct 2009
Location: CO

Posts: 444
iTrader: (1)

Quote:
Originally Posted by Palisades View Post
Well I managed to screw this up. I broke the plastic tap at the red arrow when I was trying to get the hose off. My hoses were incredibly brittle and basically fused to the plastic. Now what? I guess I have to go to the dealer tomorrow morning.
That sucks, mine were difficult to get off also, so I cut the old rubber hose with a utility knife being careful not to cut the plastic, cutting parallel to the vacuum line (slicing it open) worked for me. I'll update the first post with that info.
__________________
2007 335xi 6AT / Vishnu Procede V5 / Vishnu DCI / Vishnu Meth kit (PWM) / AR Catless downpipes / Borla racing pipes with Magnaflow muffler / Borla exhaust system / AMS intercooler

Best 1/4 time = 12.975 @ 107.15, 1.763 60' at Bandimere Speedway (5800' above sea level)
mattsfeir is offline   United_States
0
Reply With Quote
      06-19-2011, 08:15 PM   #14
Magic-Man
Banned
 
Drives: N54
Join Date: Jul 2008
Location: Northeast

Posts: 1,063
iTrader: (2)

Good to know, thanks.
Magic-Man is offline   United_States
0
Reply With Quote
      06-19-2011, 09:59 PM   #15
Joshboody
Lieutenant Colonel
 
Drives: pickemuptruck
Join Date: Jul 2009
Location: Phoenix, AZ

Posts: 1,708
iTrader: (7)

Quote:
Originally Posted by Ilma View Post
Great tip....thanks for that

Who would have thought that part could impact your boost pressure. But given that the vacuum cannisters control the wastegates - it kind of makes sense.

What other systems does that line provide vacuum for?

Sometimes on a cold start, my brake pedal will feel stone hard until the car starts and then it softens back to normal within a second. I think that is because of a loss of vacuum in that particular line you pointed out.
I take it the red arrow lines are boost control routed to the vacuum canisters on the passenger side. The blue arrow is the brake booster, which also has a tee to the exhaust flapper thingy. Anything else uses vacuum from the pump?
Joshboody is offline  
0
Reply With Quote
      06-19-2011, 11:07 PM   #16
Bimmer This
Major General
 
Drives: 2007 BMW 335i
Join Date: Nov 2008
Location: Westminster

Posts: 6,479
iTrader: (3)

So you IC was never leaking?
Bimmer This is offline  
0
Reply With Quote
      06-20-2011, 01:02 AM   #17
mattsfeir
Lieutenant
 
Drives: 335xi
Join Date: Oct 2009
Location: CO

Posts: 444
iTrader: (1)

Quote:
Originally Posted by Bimmer This View Post
So you IC was never leaking?
That was the boost leak that was fixed. Some pin holes in the end tank casting, they fixed it and it's back on the car now. Car feels great now that everything is working right.
__________________
2007 335xi 6AT / Vishnu Procede V5 / Vishnu DCI / Vishnu Meth kit (PWM) / AR Catless downpipes / Borla racing pipes with Magnaflow muffler / Borla exhaust system / AMS intercooler

Best 1/4 time = 12.975 @ 107.15, 1.763 60' at Bandimere Speedway (5800' above sea level)
mattsfeir is offline   United_States
0
Reply With Quote
      06-20-2011, 09:10 AM   #18
Ox11
Private
 
Drives: 335
Join Date: Jun 2011
Location: DMV

Posts: 56
iTrader: (1)

Great write up, I'm going to take a look at my lines as well!
Ox11 is offline  
0
Reply With Quote
      06-20-2011, 03:16 PM   #19
shiv@vishnu
Tuner
 
Drives: X1, 335i
Join Date: Sep 2006
Location: SF Bay, CA

Posts: 17,616
iTrader: (0)

Quote:
Originally Posted by (-(ellblazer420 View Post
Yup I'm the beta tester they discovered this issue on. My car would not make more than 4 psi when I dropped it off to them for the PWM meth kit install. A great easy fix. My car has only 49K on it. I strongly recommend replacing both lines to anyone who has around 50K miles or more. I bet so many have blamed their tune when it was just these lines that needed to be replaced.

Yes, I remember that day I spent the morning looking for leaks, faulty wastegates, etc,.

It wasn't until I popped off a vacuum line on the vacuum tank did I notice that something wasn't right. I didn't hear the "pfffftt" of vacuum discharging. Which meant that there was no vacuum in the tank. When I tracked the vacuum lines upstream, I noticed that they were brittle. I'm surprised we haven't heard more about this on the forum. Seems to happen to some cars at ~40k miles.

Replacing these lines has become somewhat of a regular service item for all cars that go through our shop.

Shiv
shiv@vishnu is offline   United_States
0
Reply With Quote
      06-20-2011, 05:10 PM   #20
Palisades
Private
 
Drives:
Join Date: Mar 2008

Posts: 74
iTrader: (2)

$700 at the dealership to fix the part I broke, and replace all the turbo related vacuum lines. So annoying.
Palisades is offline  
0
Reply With Quote
      06-20-2011, 08:55 PM   #21
BobS
Lieutenant Colonel
 
BobS's Avatar
 
Drives: M3
Join Date: Feb 2009
Location: Jersey City, NJ

Posts: 1,584
iTrader: (0)

Great info OP! Thanks for sharing.

Do you guys have a boost guage? I wouldn't replace the lines unless you had a issue holding boost. Why take the chance of screwing it up?
__________________

Evolve Supercharged E92 M3
BobS is offline  
0
Reply With Quote
      06-29-2011, 07:06 PM   #22
dlbrooks18
Brigadier General
 
dlbrooks18's Avatar
 
Drives: e90 335i
Join Date: Nov 2008
Location: Los Angeles

Posts: 3,565
iTrader: (2)

Quote:
Originally Posted by shiv@vishnu View Post
Yes, I remember that day I spent the morning looking for leaks, faulty wastegates, etc,.

It wasn't until I popped off a vacuum line on the vacuum tank did I notice that something wasn't right. I didn't hear the "pfffftt" of vacuum discharging. Which meant that there was no vacuum in the tank. When I tracked the vacuum lines upstream, I noticed that they were brittle. I'm surprised we haven't heard more about this on the forum. Seems to happen to some cars at ~40k miles.

Replacing these lines has become somewhat of a regular service item for all cars that go through our shop.

Shiv

Hmmm, good to know, I need to check my lines! Thanks.
__________________

2008 E90 335
dlbrooks18 is offline  
0
Reply With Quote
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 02:46 PM.




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