Results 1 to 4 of 4

Thread: 840ci Engine has loud whistling sound -Watch video!

  1. #1
    Join Date
    Sep 2010
    Location
    Phoenix
    Posts
    180
    My Cars
    840ci/540i/540i Touring

    840ci Engine has loud whistling sound -Watch video!

    My 1997 840ci has a rather annoying and loud whistling sound upon start up. It mostly goes away after driving or 30 minutes or so. Any idea the issue?

    The link below is my youtube page with a 20 second clip of the engine.

    Thanks for any assistance!

    https://youtu.be/fAoiRraizR0

  2. #2
    Join Date
    Aug 2007
    Location
    San Ramon, CA
    Posts
    1,421
    My Cars
    850Ci, M5, Model-S P85D
    I anticipate it is a vacuum Leak.
    The many profile gaskets around the M62 engine get brittle with age and can leak very badly.
    I would suggest you first test the crankcase pressure regulator by lifting the oil filler cap ever so slightly to let air into the crankcase while the engine is idling. If the cap is hard to lift and you get a big whoosh of air being sucked in, CCPR has failed.
    Next, take a can if Dust Off and place a small diameter hose, 2-3 ft long, over the pin nozzle. Then use the free end of the hose to direct the inert gas around the intake gaskets while the engine is idling. At an intake leak the engine RPM and idle smoothness will change. You can repeat the introduction of the gas at a leak to confirm the change in idle smoothness and RPMs.

  3. #3
    Join Date
    Sep 2010
    Location
    Phoenix
    Posts
    180
    My Cars
    840ci/540i/540i Touring
    Wow. THANKS for the info! I'll try that, today.

  4. #4
    Join Date
    Feb 2010
    Location
    Hampshire UK
    Posts
    8,872
    My Cars
    99 840ci Sport Indv
    It's easy to tell if that is the PCV whistling away - the noise will immediately go away if you partially lift the oil-filler cap. If the noise doesn't go away then it isn't a vacuum problem.

    If the noise does change then the PCV is the problem - and you might as well sort out all the other vacuum leaks at the same time:

    https://www.meeknet.co.uk/e31/BMW_M6...cuum_Leaks.htm
    Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i


    My BMW Repair YouTube Channel
    My Current 840ci Sport Individual
    My Current 650ci Sport Individual
    My E31 Repair and Information Website
    My E38 Repair and Information Website
    My E63/E64 Repair and Information Website

    Chase - Heroes to a generation

Similar Threads

  1. Replies: 4
    Last Post: 02-19-2017, 05:00 PM
  2. Loud poping sounds from my engine
    By teufel530 in forum 1988 - 1996 (E34)
    Replies: 26
    Last Post: 10-09-2010, 08:34 PM
  3. Very Loud Whirring Sound from Engine
    By chewietobbacca in forum 2001 - 2006 M3 (E46)
    Replies: 1
    Last Post: 07-15-2006, 11:49 PM
  4. Whistling Sound from engine.
    By crackerkorean in forum 1988 - 1996 (E34)
    Replies: 0
    Last Post: 08-18-2004, 10:50 AM
  5. Incredibly loud whistling, whining sound over 65 MPH
    By gr8full in forum 1991 - 1999 (E36)
    Replies: 1
    Last Post: 07-15-2004, 07:56 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
  •