Results 1 to 6 of 6

Thread: Weird noise in engine

  1. #1
    Join Date
    Feb 2011
    Location
    Wisconsin
    Posts
    1,750
    My Cars
    1995 BMW M3

    Weird noise in engine

    We have a 2000 325i that I picked up for my son. There is a noise coming from the engine. Anyone know where to start?

    https://www.youtube.com/watch?v=kO3rZWf5mSM
    Last edited by crc13; 10-18-2018 at 09:12 AM.

  2. #2
    Join Date
    Jan 2016
    Location
    Ca
    Posts
    6,981
    My Cars
    2001 525it
    That square box thing on the intake manifold is the disa valve they do come apart pull that and check it. Also after removing it you could block off the hole and run the engine to see if it went away. Otherwise I would remove the engine belt and run it to see if the noise goes away

  3. #3
    Join Date
    Feb 2011
    Location
    Wisconsin
    Posts
    1,750
    My Cars
    1995 BMW M3
    I unplugged the disa valve and it is still making the noise. Is there another disa valve under the manifold?

  4. #4
    Join Date
    Jul 2011
    Location
    Arlington, VA
    Posts
    9,934
    My Cars
    2018 BMW M240i
    No, that’s the only DISA valve. Use a cardboard tube from a roll of paper towels to focus your hearing. Also, Witt the engine cold, remove the main serpentine belt and start the engine to see if the noise stops. Don’t run the engine for more than 30 seconds.
    Last edited by MarcoZandrini; 10-19-2018 at 08:53 AM.

  5. #5
    Join Date
    Feb 2011
    Location
    Wisconsin
    Posts
    1,750
    My Cars
    1995 BMW M3
    I narrowed it down to the alternator. After removing the airbox I was able to put a screwdriver on the alternator and listen to it. I took the belt off and the noise went away. After looking further and spinning the alternator wheel it didn’t make any noise. But the tensioner pulley seemed loose and was making noise. Could I possibly have been hearing the tensioner pulley while listening to the alternator?

    Also, throughout this process I also took out the DIsa valve. It does not function properly. The flapper is good but it just does not stay closed if I hold the vacuum all. Would a rebuild help this?
    Last edited by crc13; 10-19-2018 at 09:04 AM.

  6. #6
    Join Date
    Dec 2013
    Location
    Chicagoland area
    Posts
    4,372
    My Cars
    EXOTICS
    It would seem the problem is the tensioner pulley.

    Disa would have to be replaced, as it seems the diaphragm has failed.

Similar Threads

  1. Replies: 4
    Last Post: 02-02-2010, 05:06 PM
  2. Weird noise from engine bay
    By rich30769 in forum 1996 - 2003 (E39)
    Replies: 4
    Last Post: 05-12-2009, 08:50 PM
  3. Weird noise when engine is turned off.... Help?
    By r2tincan in forum 1999 - 2006 (E46)
    Replies: 12
    Last Post: 04-14-2007, 03:08 PM
  4. weird noise from engine bay
    By rt turbo in forum 1992 - 1999 M3 (E36)
    Replies: 9
    Last Post: 01-31-2007, 11:04 AM
  5. Weird noise from engine bay
    By arctic_97 in forum 1992 - 1999 M3 (E36)
    Replies: 1
    Last Post: 10-28-2004, 12:57 PM

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
  •