Page 1 of 5 12345 LastLast
Results 1 to 25 of 124

Thread: Battling Vacuum Leaks

  1. #1
    Join Date
    Sep 2006
    Location
    Martinsville VA
    Posts
    2,460
    My Cars
    2003-525i BMW

    Wink Battling Vacuum Leaks

    Not sure who's interested or not but here goes. This is for i6 cars 01 and newer.

    One of the biggest problems plaguing gas mileage with our auto's is of course vacuum leaks. Aside from normal checking of your vac lines for tears and small holes you might want to try the following.
    I have been noticing that there were many talking about how the DISA valves on the 01 and newer engines were not sealing as well as the earlier models. I bought a sheet of rubberized gasket paper from Auto Zone a few weeks ago. I then took my disa valve off and measured the area and cut with a Xacto knife two gaskets to fit neatly between the valve and the intake when tightened back down.
    After doing that gasket I also removed the throttle body and cut another gasket for that part as well. While having all that down I cleaned the idle control valve and where it goes back into the intake, I wrapped a couple of layers of electrical tape on the part of the idle valve that goes back into the intake for a better seal.
    When buttoning everything back up I gave the gaskets and the taped area's a light coating of white lithium grease for a good seal.
    I used to hear a slight whooosh when giving the car the gas to pull up in my driveway, that noise is now gone and the car feels to pull much better in the complete rpm range.
    I have also noticed better mileage around town driving.
    Not sure which part was helped most by the above-but I feel that it did make a difference. The following link will give a complete list of where to find vac leaks on the I6 cars
    http://www.bimmerfest.com/forums/sho...t=vacuum+leaks

    Last edited by Poolman; 05-06-2014 at 08:32 AM.

  2. #2
    Join Date
    Sep 2007
    Location
    San Jose, CA
    Posts
    264
    My Cars
    02 530ia
    Can you provide pictures of the DISA valves please. This may be the solution I'm looking for. Thank You
    Last edited by 530 Sport; 09-14-2008 at 03:18 PM.

    I know, I know, but they make me smile!

  3. #3
    Join Date
    May 2007
    Location
    Cowtown -The Great NW
    Posts
    3,355
    My Cars
    2003 530iA
    Same here. Not sure what DISA valves are?

  4. #4
    Join Date
    Mar 2008
    Location
    Belleville, NJ, USA
    Posts
    252
    My Cars
    2003 M5 LeMans Blue
    this is very interesting, do you have any pics?

  5. #5
    Join Date
    Sep 2006
    Location
    Martinsville VA
    Posts
    2,460
    My Cars
    2003-525i BMW
    I'm sorry I don't have any pic's but I'll try to discribe the part

    The Disa valve is also called the adjuster unit--it looks like a rectangle box located on the top right side of the intake manifold. It's held on by two torx screws--it's function is to redirect air through the intake manifold when rpm's hit 3k--helps in power.

  6. #6
    Join Date
    Sep 2007
    Location
    San Jose, CA
    Posts
    264
    My Cars
    02 530ia
    I pulled my DISA valve yesterday, put a small bead of red gasket maker on top of the exisiting "O-ring" type of gasket that was already there, put it all back together and my high pitched whistling sound went away. Not to mention, my car seems to have found some missing low end power. Best 20 minute fix I have done to date.

    I know, I know, but they make me smile!

  7. #7
    Join Date
    Nov 2006
    Location
    Sacramento, CA
    Posts
    1,746
    My Cars
    2005 525i/6
    I think my car suffers from this "whoosh" you're talking about... Is it possible my 99 has this same valve and possibly this same problem? It would be great if it was something this simple, the noise is quite annoying. Great info!

  8. #8
    Join Date
    Sep 2007
    Location
    San Jose, CA
    Posts
    264
    My Cars
    02 530ia
    Here is a picture courtesy of Gumbi.


    I know, I know, but they make me smile!

  9. #9
    Join Date
    Feb 2006
    Location
    In the wood
    Posts
    3,760
    My Cars
    02-530 stick Blown
    Great find, got to love it those easy fixes.

  10. #10
    Join Date
    Sep 2006
    Location
    Martinsville VA
    Posts
    2,460
    My Cars
    2003-525i BMW
    I would advise all with this DISA valve to try either of the two tricks listed above and along with that the electrical tape on the part of the idle control valve that goes back into the intake--that rubber nipple that the icv goes back into can suck air--the tape helps seal that much better---worked for me
    If you go the route of putting the small bead of sealent around the base of the DISA Valve--let it set up about 20 min before doing the reinstall and also spray a little WD40 on the mating surface also--makes sure they don't bond together and you can take it all back apart some day.
    Defaz--your model DISA valve I belive it has a gasket or 0 ring to prevent any vacuum from escaping--I may be wrong tough--sometimes I am

  11. #11
    Join Date
    May 2007
    Location
    Cowtown -The Great NW
    Posts
    3,355
    My Cars
    2003 530iA
    Thanks Poolman. Great info. I have inserted your find in this post under Vacuum Leak fixes for i6 engines (DIY section). Hope you don't mind

  12. #12
    Join Date
    Mar 2008
    Location
    Belleville, NJ, USA
    Posts
    252
    My Cars
    2003 M5 LeMans Blue
    wow i hear the same thing... im def doing this !!

  13. #13
    Join Date
    Sep 2006
    Location
    Martinsville VA
    Posts
    2,460
    My Cars
    2003-525i BMW
    Thanks Doro for the interest--while your bringing more to the DIY section might I suggest the post a few days back where one of our members took pics of how to remove the i6 oil filter and repair the gaskets underneath--was quite a good DIY
    write up in my opinioun---wanted to insert it myself but don't know how--it was written by a BMW tech thats a member here.
    When removing the DISA valve--remove the upper and lower torx bolts and then pull the unit back away from the engine--it sorta slides out away from the intake when removing it.
    Last edited by Poolman; 09-15-2008 at 05:43 PM.

  14. #14
    Join Date
    Sep 2006
    Location
    Martinsville VA
    Posts
    2,460
    My Cars
    2003-525i BMW
    Doru--Check out this DIY --I certainly think it needs to be added to your list--
    bet a number of us do---by the way--whats the quick way to get to that link
    when first coming on?
    http://forums.bimmerforums.com/forum....php?t=1070662

  15. #15
    Join Date
    May 2007
    Location
    Cowtown -The Great NW
    Posts
    3,355
    My Cars
    2003 530iA
    Quote Originally Posted by Poolman View Post
    Doru--Check out this DIY --I certainly think it needs to be added to your list--
    bet a number of us do---by the way--whats the quick way to get to that link
    when first coming on?
    http://forums.bimmerforums.com/forum....php?t=1070662
    Sorry for being late with my answer (I am a coach too, and was quite busy yesterday after work - tryouts)
    So, this one was added when it was posted a few weeks back. Here is the path:
    the VERY best of E39 Links / Page2 /Post #31.
    Look in the DIY section, look up Oil: Oil filter housing Seal replacement DIY.

    I tried to make it as easy to find as possible. Also, the 10th link in DIY section named: Automotive Repair Library, has an unbelievable amount of excellent info, which can be used on any vehicle.

  16. #16
    Join Date
    Sep 2006
    Location
    Martinsville VA
    Posts
    2,460
    My Cars
    2003-525i BMW
    Thanks for the good work--lots of good info

  17. #17
    Join Date
    Mar 2007
    Location
    Middle of a corn field
    Posts
    13,215
    My Cars
    E39 hamster/ruberbandPWR
    Quote Originally Posted by Poolman View Post
    Thanks for the good work--lots of good info
    Totally agree!
    Excellent info!

    Poolman, do you have your new MAF installed yet?
    Notice any difference???

    Thanks!
    Jason

  18. #18
    Join Date
    Sep 2006
    Location
    Martinsville VA
    Posts
    2,460
    My Cars
    2003-525i BMW
    Hey Jason--yes I have my new OEM Maf on--I'm not sure if it's helped or not as of yet--You won't believe it but I just found a new spot for a vac leak just now and I'm excited about this find--more than whats posted above.

    Under the cover on top of the engine hiding the injectors and all--there is a latice
    looking part that runs to the top of the intake and goes to each runner--thats the
    runners that bring what ever blow by thats coming thru the engine back into the manifold to be consumed by the engine. There are plastic tubes coming from the oil seperator to this part.
    Now with the cover off I noticed that there are little tubes coming off of this part going down into the top of the intake manifold--one at each runner. I presume there
    is a rubber 0 ring on each part to seal it all from vac leaks. I got the idea to take a straw and fill it with water and let the water drain into each area around where the tubes fit into the intake. With water filling the crevise around each of these little tubes
    I cranked the car--on each and every tube the water sat there just as I had filled
    the area. On the very back though I noticed that there wasn't any water sitting
    on top. I cut off the engine got my straw out again and tried to fill the back part again with water--it wouldn't fill --water just drained down into the intake there.
    Thats a vac leak for sure--now I gotta figure out how to seal it.---This also means that that back cylinder is most likely running a little lean at times.

    I'm thinking of just using some sensor safe blue Perma tex gasket silicone around that one post thats leaking---hhhhmmmmm

    Just figured out why it's leaking there and no where else--the wires and all going to the injectors are anchored there on that last post by a plastic stay clip--it's being pulled on and that tension or torque has put stress there on that lone section and caused the leak.
    Last edited by Poolman; 09-18-2008 at 06:36 PM.

  19. #19
    Join Date
    Mar 2007
    Location
    Middle of a corn field
    Posts
    13,215
    My Cars
    E39 hamster/ruberbandPWR
    Quote Originally Posted by Poolman View Post
    Hey Jason--yes I have my new OEM Maf on--I'm not sure if it's helped or not as of yet--You won't believe it but I just found a new spot for a vac leak just now and I'm excited about this find--more than whats posted above.

    Under the cover on top of the engine hiding the injectors and all--there is a latice
    looking part that runs to the top of the intake and goes to each runner--thats the
    runners that bring what ever blow by thats coming thru the engine back into the manifold to be consumed by the engine. There are plastic tubes coming from the oil seperator to this part.
    Now with the cover off I noticed that there are little tubes coming off of this part going down into the top of the intake manifold--one at each runner. I presume there
    is a rubber 0 ring on each part to seal it all from vac leaks. I got the idea to take a straw and fill it with water and let the water drain into each area around where the tubes fit into the intake. With water filling the crevise around each of these little tubes
    I cranked the car--on each and every tube the water sat there just as I had filled
    the area. On the very back though I noticed that there wasn't any water sitting
    on top. I cut off the engine got my straw out again and tried to fill the back part again with water--it wouldn't fill --water just drained down into the intake there.
    Thats a vac leak for sure--now I gotta figure out how to seal it.---This also means that that back cylinder is most likely running a little lean at times.

    I'm thinking of just using some sensor safe blue Perma tex gasket silicone around that one post thats leaking---hhhhmmmmm

    Just figured out why it's leaking there and no where else--the wires and all going to the injectors are anchored there on that last post by a plastic stay clip--it's being pulled on and that tension or torque has put stress there on that lone section and caused the leak.
    WOW!
    I am definitely going to need some pictures on this one!!!

    Thanks!
    Jason

  20. #20
    Join Date
    Nov 2006
    Location
    Western MA
    Posts
    1,255
    My Cars
    535xiT, 325iT, '07 L322
    I'm going to make a GUESS at this. See the yellow part, circled? The leak would be on the similar item, at the back of the engine. Red arrow points to it.

    Photo courtesy Beisan Systems, and borrowed without permission... by a happy customer



    Poolman -- was I close?
    Last edited by cpatstone; 09-18-2008 at 08:04 PM.

  21. #21
    Join Date
    Sep 2006
    Location
    Martinsville VA
    Posts
    2,460
    My Cars
    2003-525i BMW
    Cpatstone---you have beat me to the pic--if I even knew how---thats the very place that I'm talking about---I have filled that spot with silicone(sensor safe) and now when the car is cold and I crank her--she idles really smooth--will wait till AM
    to really see how this helps--have spent the last few hours with the most beautiful
    woman(who I'm married to) drinking quite heavely--even she agrees--I'm a gifted guy.
    Poolman

    It's no brag--just fact

  22. #22
    Join Date
    Mar 2008
    Location
    Orlando, FL
    Posts
    617
    My Cars
    99 BMW 528iT
    so vacuum leaks give the car that whoosh sound on acceleration? my car sounds like a friggin air plane in low 1st gear!

  23. #23
    Join Date
    Sep 2006
    Location
    Martinsville VA
    Posts
    2,460
    My Cars
    2003-525i BMW
    Vac leaks rob you of gas mileage and power---vac leaks are bad OK

  24. #24
    Join Date
    Mar 2007
    Location
    Middle of a corn field
    Posts
    13,215
    My Cars
    E39 hamster/ruberbandPWR
    Quote Originally Posted by Poolman View Post
    Cpatstone---you have beat me to the pic--if I even knew how---thats the very place that I'm talking about---I have filled that spot with silicone(sensor safe) and now when the car is cold and I crank her--she idles really smooth--will wait till AM
    to really see how this helps--have spent the last few hours with the most beautiful
    woman(who I'm married to) drinking quite heavely--even she agrees--I'm a gifted guy.
    Poolman

    It's no brag--just fact
    Wow!
    I hope all went well!!!
    You are going to have to give me a call and let me know how it went!

  25. #25
    Join Date
    May 2007
    Location
    Cowtown -The Great NW
    Posts
    3,355
    My Cars
    2003 530iA
    Oh my Poolman! Jest liv'er alone will ya!
    Now I have some wrenchin' to do.

Page 1 of 5 12345 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •