E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   E46Fanatics > E46 BMW > General E46 Forum

General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 04-24-2011, 07:07 PM   #1
zxm4ever
Registered User
 
Join Date: Apr 2011
Location: UK
Posts: 22
My Ride: E46 325i sport
Vacuum leak causing EML - F connector

Hi everyone, I am still looking for the vacuum leak somewhere from my intake. Still no luck, tested everthing, smoke tested, took everthing apart twice, easy start spray tested, no luck at all. (if you have no idea what am I talking about, please google "BMW E46 sucking noise/whoose noise", and you'll see around 20 threads with no answers. I am one of the poor owners who replaced every possible hose/valve/sensor/gasket with no luck what so ever)

The car runs superb, apart from the EML light comes on around 50 miles of normal driving after I switch it off. I have already done this nearly 20 times, so you can guess how pissed I am, I am ready to set it on fire at any time.

However, I have found this thread recently, regarding the F connector on the intake boot (see pic)Click image for larger version

Name:	bmw001-1.jpg
Views:	862
Size:	165.8 KB
ID:	401528

I took it off from the Intake Boot, and blow it with the other two hoses attached, and its free, no vacuum, no pressure, its seems like nothing is attached to the other ends. is this normal? and where are they connected at the other ends? Also the most important find is that when I blow it, the "air coming out sound" is exactly where the leaking/sucking/whoose/ noise comes from ~~!!!!!, some where around the throttle body and seems inside the intake itself, or somewhere near, cannot identify.

Please help me~~~ I think this might just be it, I might get it fixed this time~
Thank you so much
zxm4ever is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 04-24-2011, 09:08 PM   #2
Cheezemurda
Registered User
 
Join Date: Nov 2006
Location: Texas
Posts: 451
My Ride: 2002 330ci
Did you check the lower intake boot? That elbow piece is the part that always cracks.


__________________
Cheezemurda is offline   Reply With Quote
Old 04-25-2011, 06:36 AM   #3
zxm4ever
Registered User
 
Join Date: Apr 2011
Location: UK
Posts: 22
My Ride: E46 325i sport
Quote:
Originally Posted by Cheezemurda View Post
Did you check the lower intake boot? That elbow piece is the part that always crack.
A thousand times already, mate~

So far I have replaced (all OEM parts)

Upper intake boot
Lower intake boot
Throttle body gasket
ICV tube/gasket
DISA Valve
PCV/CCV valve with All four hoses
Dip stick O-ring
MAF sensor
Pre car oxgen sensor
Air filter


Did a smoke test, and found nothing.
Spray "easy start" around the entire intake manifold, nothing

And since I have already taken everything apart twice, so I am pretty sure that I have done a good job. I even replaced all the metal clips.

So if anyone else is unlucky enough to have the same engine noise as this
do no bother change anthing listed above, its a total waste of money, because all the above work have made no difference at ALL.
zxm4ever is offline   Reply With Quote
Old 04-25-2011, 03:40 PM   #4
Cheezemurda
Registered User
 
Join Date: Nov 2006
Location: Texas
Posts: 451
My Ride: 2002 330ci
Wow, I have no idea. It seems as if you have replaced anything and everything that would cause that noise. I'm just as stumped as you are. Hopefully someone else will chime in on this...
__________________
Cheezemurda is offline   Reply With Quote
Old 04-25-2011, 03:42 PM   #5
CylonRed
Registered User
 
Join Date: Jun 2010
Location: SW Ohio
Posts: 784
My Ride: '01 E46 330i sport
Have you checked RealOEM to see where the F-Tuber should go to and traced yours back to the same spot?
CylonRed is offline   Reply With Quote
Old 04-25-2011, 03:45 PM   #6
xavi330i
Registered User
 
Join Date: Oct 2006
Location: Tampa, Florida
Posts: 2,958
My Ride: 2004 330i smg
You forgot to check the fuel pressure regulator vacuum hose, it is attached to the fuel filter on a 330. Not sure about a 325 though. The little vacuum hose dry rots badly. It is the small hose on your F connector. It should lead you to the fuel pressure regulator. Code reader would help too.
__________________

Last edited by xavi330i; 04-25-2011 at 03:49 PM.
xavi330i is offline   Reply With Quote
Old 04-25-2011, 03:48 PM   #7
blarf
Registered User
 
Join Date: Oct 2009
Location: Bay Area
Posts: 992
My Ride: '00 323i
PCV/CCV system.
__________________
Quote:
Originally Posted by howie View Post
do you park near poodles?
blarf is offline   Reply With Quote
Old 04-26-2011, 02:47 PM   #8
zxm4ever
Registered User
 
Join Date: Apr 2011
Location: UK
Posts: 22
My Ride: E46 325i sport
Quote:
Originally Posted by xavi330i View Post
You forgot to check the fuel pressure regulator vacuum hose, it is attached to the fuel filter on a 330. Not sure about a 325 though. The little vacuum hose dry rots badly. It is the small hose on your F connector. It should lead you to the fuel pressure regulator. Code reader would help too.
Thank you guys so much for your replies~~

and, let me tell you more about my story.

The fuel filter is changed one month ago while an Inspection II, so that's no problem.

There are two fault code
1. pre cat oxgen sensor fault
2. engine running lean

The pre cat oxgen sensor is 4 hours old, so...

I don't know what those tubes are, but a mechnic friend overseas told me to test them with a "surgical clamp", I clamped each hose at a time and reved the engine, no difference at all, only a slight unstable idle for a second and everthing seems just fine again. and clamping any of them does NOT make a difference to the sucking noise.

please see photos, the red line are where I clamped, also including both hose from the "F connector", don't know what is it in the blue circle, but it seems like it does not do much.
Click image for larger version

Name:	imagesCAG7YELO.jpg
Views:	890
Size:	52.3 KB
ID:	401683

I have only found there is another hose under the manifold, does anyone know what this is? and can I access it without taking the manifold off?
Click image for larger version

Name:	P4010012a.jpg
Views:	889
Size:	275.6 KB
ID:	401684

Also this photo, what is the thing at the bottom left corner, throttle body? where is no.3 connected at the other end?
Click image for larger version

Name:	220.png
Views:	729
Size:	20.6 KB
ID:	401682

Thank you so much, everyone. please don't let this thread drown, I am not trying to be fuss, but I think this is the "problem of the decade".
zxm4ever is offline   Reply With Quote
Old 04-26-2011, 02:55 PM   #9
xavi330i
Registered User
 
Join Date: Oct 2006
Location: Tampa, Florida
Posts: 2,958
My Ride: 2004 330i smg
Again...the fuel filter isn't the issue here, it is the hose for the fuel pressure regulator. If that small vacuum hose is not intact, you will run lean.
__________________
xavi330i is offline   Reply With Quote
Old 04-26-2011, 03:10 PM   #10
zxm4ever
Registered User
 
Join Date: Apr 2011
Location: UK
Posts: 22
My Ride: E46 325i sport
Quote:
Originally Posted by xavi330i View Post
Again...the fuel filter isn't the issue here, it is the hose for the fuel pressure regulator. If that small vacuum hose is not intact, you will run lean.
I don't know where is it located, could you show me?

also, where is this connected at the other end?

Click image for larger version

Name:	219.png
Views:	499
Size:	30.2 KB
ID:	401685
zxm4ever is offline   Reply With Quote
Old 04-26-2011, 03:24 PM   #11
SweTurbo
Banned User
 
Join Date: Nov 2008
Location: Europe
Posts: 2,899
My Ride: 323i -98
The F tube attaches to :

Upper part - Something with the brake booster/intake manifold
Lower part - Fuel Pressure Regulator
Bottom - Intake tubing

EML lights are problems with the engines electronical control system and it's parts.
You should try lubricating/cleaning your throttle body , a throttle body stuck will trigger the EML light.

Last edited by SweTurbo; 04-26-2011 at 03:25 PM.
SweTurbo is offline   Reply With Quote
Old 04-26-2011, 03:32 PM   #12
zxm4ever
Registered User
 
Join Date: Apr 2011
Location: UK
Posts: 22
My Ride: E46 325i sport
Quote:
Originally Posted by Pir4t View Post
The F tube attaches to :

Upper part - Something with the brake booster/intake manifold
Lower part - Fuel Pressure Regulator
Bottom - Intake tubing

EML lights are problems with the engines electronical control system and it's parts.
You should try lubricating/cleaning your throttle body , a throttle body stuck will trigger the EML light.

Thanks~

When I took everything off, I cleaned both throttle body and idle control valve, they all seems fine. also, if these things are faulty/stuck, will there be a code shown?
zxm4ever is offline   Reply With Quote
Old 04-27-2011, 09:24 AM   #13
WindsorBMW325
Registered User
 
Join Date: Dec 2009
Location: windsor
Posts: 5
My Ride: 325i
Hey
Just a thought but you might want to check your fuel pump to make sure that it is running at 50 psi.
WindsorBMW325 is offline   Reply With Quote
Old 04-27-2011, 09:33 AM   #14
throttlehead
Registered User
 
Join Date: Oct 2008
Location: columbus, Ohio
Posts: 320
My Ride: 330i Imola ZHP 6MT
how is the fuel pump tested for psi ?

A few thousand miles after insalling my AFE intake the car has thrown an SES. while i am past a service period (technically) codes red are the typical) O2 sensors, MAF or significant Vac leak. both banks running lean.
__________________
2003 BMW 330i ZHP
Imola Red Saloon
6MT
throttlehead is offline   Reply With Quote
Old 04-27-2011, 10:16 AM   #15
SweTurbo
Banned User
 
Join Date: Nov 2008
Location: Europe
Posts: 2,899
My Ride: 323i -98
Quote:
Originally Posted by throttlehead View Post
how is the fuel pump tested for psi ?

A few thousand miles after insalling my AFE intake the car has thrown an SES. while i am past a service period (technically) codes red are the typical) O2 sensors, MAF or significant Vac leak. both banks running lean.
You hook up a pressure gauge on the pressure gauge slot on the fuel rail

OP : Do you get any codes exept from the EML light ?
SweTurbo is offline   Reply With Quote
Old 04-28-2011, 09:46 AM   #16
zxm4ever
Registered User
 
Join Date: Apr 2011
Location: UK
Posts: 22
My Ride: E46 325i sport
Quote:
Originally Posted by Pir4t View Post
You hook up a pressure gauge on the pressure gauge slot on the fuel rail

OP : Do you get any codes exept from the EML light ?
Hi guys, thanks for the brainstroming~

I don't have a pressure gauge, and with all due respect for you.

I don't think there are any problems with the fuel pressure, because the car runs fine, spot on, except that sucking noise.

there are two codes, one is the "pre cat oxygen sensor" and another "engine running lean/air leak"

can someone please tell me what are those tubes and especially the one under the intake manifold (my previous reply) ?
that is where the sucking noise coming from and I am suspecting that is the problem, the car is still with the repair shop, but I am going to there now and show him the pic, I will keep everyone posted.

thanks
zxm4ever is offline   Reply With Quote
Old 04-28-2011, 03:17 PM   #17
flashmeow
Banned User
 
Join Date: Apr 2008
Location: Dallas, TX
Posts: 2,220
My Ride: E30-E46-E90-E90M-F30
Quote:
Originally Posted by zxm4ever View Post
Thank you guys so much for your replies~~

and, let me tell you more about my story.

The fuel filter is changed one month ago while an Inspection II, so that's no problem.

There are two fault code
1. pre cat oxgen sensor fault
2. engine running lean

The pre cat oxgen sensor is 4 hours old, so...

I don't know what those tubes are, but a mechnic friend overseas told me to test them with a "surgical clamp", I clamped each hose at a time and reved the engine, no difference at all, only a slight unstable idle for a second and everthing seems just fine again. and clamping any of them does NOT make a difference to the sucking noise.

please see photos, the red line are where I clamped, also including both hose from the "F connector", don't know what is it in the blue circle, but it seems like it does not do much.
Attachment 401683

I have only found there is another hose under the manifold, does anyone know what this is? and can I access it without taking the manifold off?
Attachment 401684

Also this photo, what is the thing at the bottom left corner, throttle body? where is no.3 connected at the other end?
Attachment 401682

Thank you so much, everyone. please don't let this thread drown, I am not trying to be fuss, but I think this is the "problem of the decade".
the last two picture is the same thing thing. that hose (picture 2) goes to your fuel purge valve (picture #3).
flashmeow is offline   Reply With Quote
Old 04-28-2011, 03:33 PM   #18
flashmeow
Banned User
 
Join Date: Apr 2008
Location: Dallas, TX
Posts: 2,220
My Ride: E30-E46-E90-E90M-F30
also...don't mean to be an ******* but smoke test is your ultimate bet. I know you got a smoke test done twice but did your tech do it properly? Sometimes tech failed to open the throttle butterfly flap to let the smoke travel to the entire intake system.
flashmeow is offline   Reply With Quote
Old 04-28-2011, 04:58 PM   #19
zxm4ever
Registered User
 
Join Date: Apr 2011
Location: UK
Posts: 22
My Ride: E46 325i sport
Quote:
Originally Posted by flashtwosix View Post
also...don't mean to be an ******* but smoke test is your ultimate bet. I know you got a smoke test done twice but did your tech do it properly? Sometimes tech failed to open the throttle butterfly flap to let the smoke travel to the entire intake system.
You are an absolut genius, I will try another garauge after the Royal Wedding~~

Thanks a lot

PS. got the car back, same **** as usual, the annoying sucking noise is still there. Already booked another specialist next Tue
zxm4ever is offline   Reply With Quote
Old 04-28-2011, 06:33 PM   #20
flashmeow
Banned User
 
Join Date: Apr 2008
Location: Dallas, TX
Posts: 2,220
My Ride: E30-E46-E90-E90M-F30
Quote:
Originally Posted by zxm4ever View Post
You are an absolut genius, I will try another garauge after the Royal Wedding~~

Thanks a lot

PS. got the car back, same **** as usual, the annoying sucking noise is still there. Already booked another specialist next Tue
the reason why I know is because I just built my own smoke tester ($55 total USD) and realized what my previous tech did (or failed to do).

btw...that whooping noise you posted on youtube sounds EXACTLY like a bad CCV but this doesn't make sense because you just replaced your oil seperator recently...so confusing
flashmeow is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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 On
Censor is ON





All times are GMT -5. The time now is 07:57 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
(c) 1999 - 2011 performanceIX Inc - privacy policy - terms of use