Results 1 to 12 of 12

Thread: Whining noice when lifting throttle

  1. #1
    Join Date
    Apr 2018
    Location
    Nakskov, Denmark
    Posts
    5
    My Cars
    1999 BMW E46 318i Sedan

    Whining noice when lifting throttle

    Hello ladies and gentlemen

    My e46 318i is doing some truly annoying whining noices when lifting the throttle and/or keeping it at a steady rpm. It only happens after longer trips(driving 1.5 hours to work). If I turn off the car for 10 minutes the noice dissappears for a short while(3-5 minutes) and it comes back. On short trips it never appears.

    I'd truly appreciate if some knows what is or at least have some ideas of what it could be.

    If I have posted this in the wrong forum, please move it and notify me where it had been moved to, thank you.

    I've added a video below, not great quality as I was focusing on not running anyone over. You can clearly hear the whining noice if you're listening for it.



    Sendt fra min ONEPLUS A5010 med Tapatalk

  2. #2
    dworthy's Avatar
    dworthy is offline Wagon meister :) BMW Tech Expert
    Join Date
    Nov 2010
    Location
    Baumholder, Germany
    Posts
    10,818
    My Cars
    05 325it 05 M3 95 318is
    Welcome to the Forum!

    I can think of a couple of things that will cause a noise like that:

    1) Bad idle/tensor pulleys.
    2) Bad alternator.
    3) Possible vacuum leak

    Things to check:

    1 and 2) Remove the main and A/C belt and spin the pulleys and accessories.
    3) Have a look under the bonnet at all the rubber hoses going from the airbox to the intake. If you see any cracks, splits then replace the boot. Be sure to squeeze the rubber boot, as at times, it will hide in the accordion. Also be sure to check the small rubber vacuum lines as well.
    Last edited by dworthy; 04-14-2018 at 06:30 AM.
    Darin
    Current:
    05 325it Electric Red(438)/Gray(N6TT) ZCW, ZSP 5sp Manual Back set cover, trunk mat, Euro Infra-Rot front windshield, and mud flaps! Mr. Wagon (Original Owner)
    05 M3 Imolarot II(405)/Gray(N5TT) ZCW, ZPP 6sp Manual C.F. Lip, CSL diffuser, Euro Infra-Rot front windshield and a trunkliner! Mr. Go_Fast (Stored for the Winter, 2nd Owner)
    Past:
    95 318is Montreal Blue Met (297)/Beige(K1SN) A Hooptie! (10th Owner; That is what happens when it gets passed around by Soldiers!)
    84 M535i gray market Burgandy Rot Met/Black Leather Lowered by Intrax on bilies, poly everywhere, B&B cat back system, K&N, and a hitch! Da Beast - Still running w/375k+! (2nd Owner)
    91 316i euro Tizianrot/Gray cloth - E-36 w/M-40 motor, such a beater, but great on gas! Best was 38 MPG (2nd Owner)
    82 528i euro Saphire Blue Met/Blue Leather RIP
    79 525 euro Green/Green RIP
    79 318 Silver/Black - The first one that got it all started
    M-Flight Member

  3. #3
    Join Date
    Apr 2018
    Location
    Nakskov, Denmark
    Posts
    5
    My Cars
    1999 BMW E46 318i Sedan
    Quote Originally Posted by dworthy View Post
    Welcome to the Forum!

    I can think of a couple of things that will cause a noise like that:

    1) Bad idle/tensor pulleys.
    2) Bad alternator.
    3) Possible vacuum leak

    Things to check:

    1 and 2) Remove the main and A/C belt and spin the pulleys and accessories.
    3) Have a look under the bonnet at all the rubber hoses going from the airbox to the intake. If you see any cracks, splits then replace the boot. Be sure to squeeze the rubber boot, as at times, it will hide in the accordion. Also be sure to check the small rubber vacuum lines as well.
    Thank you, dworthy!

    I'll try to see if any of those and return with an answer.

    Sendt fra min ONEPLUS A5010 med Tapatalk

  4. #4
    dworthy's Avatar
    dworthy is offline Wagon meister :) BMW Tech Expert
    Join Date
    Nov 2010
    Location
    Baumholder, Germany
    Posts
    10,818
    My Cars
    05 325it 05 M3 95 318is
    Also another thought comes to mind: Rear Diff. If none of the above makes a difference, I would jack up the rear end and see if it is low on fluid.
    Darin
    Current:
    05 325it Electric Red(438)/Gray(N6TT) ZCW, ZSP 5sp Manual Back set cover, trunk mat, Euro Infra-Rot front windshield, and mud flaps! Mr. Wagon (Original Owner)
    05 M3 Imolarot II(405)/Gray(N5TT) ZCW, ZPP 6sp Manual C.F. Lip, CSL diffuser, Euro Infra-Rot front windshield and a trunkliner! Mr. Go_Fast (Stored for the Winter, 2nd Owner)
    Past:
    95 318is Montreal Blue Met (297)/Beige(K1SN) A Hooptie! (10th Owner; That is what happens when it gets passed around by Soldiers!)
    84 M535i gray market Burgandy Rot Met/Black Leather Lowered by Intrax on bilies, poly everywhere, B&B cat back system, K&N, and a hitch! Da Beast - Still running w/375k+! (2nd Owner)
    91 316i euro Tizianrot/Gray cloth - E-36 w/M-40 motor, such a beater, but great on gas! Best was 38 MPG (2nd Owner)
    82 528i euro Saphire Blue Met/Blue Leather RIP
    79 525 euro Green/Green RIP
    79 318 Silver/Black - The first one that got it all started
    M-Flight Member

  5. #5
    Join Date
    Mar 2017
    Location
    Norwich, Connecticut.
    Posts
    335
    My Cars
    E46,MB,Volvo,Audi,MG..
    Bad alternator Hmm...A good symptom to investigate although I'm trying to imagine this possibility here too. Vacuum could take several minutes to drop negative sound producing pressures although possible. I just had tensioner issues with mine and they, 2 of them (alt. wtr pump) not ac) didn't resemble his claim, if he is describing issues well enough for others to chime in. I've never experienced what alternators sound when failing...Brushes can wear out, bearings can fail....Never happened me even with my 420+K original alternator in the 84 300D...but did replace twice the voltage-brush replacements.
    Last edited by Eaglesail; 04-18-2018 at 02:17 PM.

  6. #6
    Join Date
    Apr 2018
    Location
    Nakskov, Denmark
    Posts
    5
    My Cars
    1999 BMW E46 318i Sedan
    A little update:

    I haven't been able to look into any of the things you gentlemen suggested yet, but one thing I have noticed is that it have started whining when idling as well. Not sure if it changes what could be wrong.

    Will take it to the mechanic next week.

    Sendt fra min ONEPLUS A5010 med Tapatalk

  7. #7
    dworthy's Avatar
    dworthy is offline Wagon meister :) BMW Tech Expert
    Join Date
    Nov 2010
    Location
    Baumholder, Germany
    Posts
    10,818
    My Cars
    05 325it 05 M3 95 318is
    Is it louder first thing in the morning, or after the car warms up? If it is doing it at idle, does it matter if you have the clutch engaged or not? For example you are in neutral with the car running and the clutch out, or sitting in the car with the clutch pushed in.
    Darin
    Current:
    05 325it Electric Red(438)/Gray(N6TT) ZCW, ZSP 5sp Manual Back set cover, trunk mat, Euro Infra-Rot front windshield, and mud flaps! Mr. Wagon (Original Owner)
    05 M3 Imolarot II(405)/Gray(N5TT) ZCW, ZPP 6sp Manual C.F. Lip, CSL diffuser, Euro Infra-Rot front windshield and a trunkliner! Mr. Go_Fast (Stored for the Winter, 2nd Owner)
    Past:
    95 318is Montreal Blue Met (297)/Beige(K1SN) A Hooptie! (10th Owner; That is what happens when it gets passed around by Soldiers!)
    84 M535i gray market Burgandy Rot Met/Black Leather Lowered by Intrax on bilies, poly everywhere, B&B cat back system, K&N, and a hitch! Da Beast - Still running w/375k+! (2nd Owner)
    91 316i euro Tizianrot/Gray cloth - E-36 w/M-40 motor, such a beater, but great on gas! Best was 38 MPG (2nd Owner)
    82 528i euro Saphire Blue Met/Blue Leather RIP
    79 525 euro Green/Green RIP
    79 318 Silver/Black - The first one that got it all started
    M-Flight Member

  8. #8
    Join Date
    Apr 2018
    Location
    Nakskov, Denmark
    Posts
    5
    My Cars
    1999 BMW E46 318i Sedan
    If I start it up in the morning there is no sound. It comes after about 1h of driving. The sound is there both if the clutch is in and out. However I think it might be slightly louder when the rpm is falling faster, but not certainly.

    Sendt fra min ONEPLUS A5010 med Tapatalk

  9. #9
    Join Date
    Aug 2014
    Location
    Lawrence Kansas
    Posts
    1,073
    My Cars
    2004 325XI/2008 GL320
    I've had two noises that were similar to that. Both would occur after driving a long while, but not really provoked by engine RPM. One was the HVAC fan, and the other was the DME fan.

  10. #10
    Join Date
    Mar 2017
    Location
    Norwich, Connecticut.
    Posts
    335
    My Cars
    E46,MB,Volvo,Audi,MG..
    Alternator brushes when upon their last contact to the armature make a similar sound a carbon-to-spring collapse. It can take an hour for the failure to conclude... I have witnessed such...( a whining sound he describes happens)...He did not denote other observations that could indicate other mechanicals for possibility. The rear-end dry is a possibility but in all likelihood, and there aren't common or frequent reports for such....hmmm
    Last edited by Eaglesail; 04-20-2018 at 02:55 PM.

  11. #11
    dworthy's Avatar
    dworthy is offline Wagon meister :) BMW Tech Expert
    Join Date
    Nov 2010
    Location
    Baumholder, Germany
    Posts
    10,818
    My Cars
    05 325it 05 M3 95 318is
    Quote Originally Posted by Eaglesail View Post
    Alternator brushes when upon their last contact to the armature make a similar sound a carbon-to-spring collapse. It can take an hour for the failure to conclude... I have witnessed such...( a whining sound he describes happens)...He did not denote other observations that could indicate other mechanicals for possibility. The rear-end dry is a possibility but in all likelihood, and there aren't common or frequent reports for such....hmmm
    Quite true, and the problem is none of us is sitting right at the car to hear the actual sound. We have to throw out possibilities of failure to have the OP check to mark it off the list.
    Darin
    Current:
    05 325it Electric Red(438)/Gray(N6TT) ZCW, ZSP 5sp Manual Back set cover, trunk mat, Euro Infra-Rot front windshield, and mud flaps! Mr. Wagon (Original Owner)
    05 M3 Imolarot II(405)/Gray(N5TT) ZCW, ZPP 6sp Manual C.F. Lip, CSL diffuser, Euro Infra-Rot front windshield and a trunkliner! Mr. Go_Fast (Stored for the Winter, 2nd Owner)
    Past:
    95 318is Montreal Blue Met (297)/Beige(K1SN) A Hooptie! (10th Owner; That is what happens when it gets passed around by Soldiers!)
    84 M535i gray market Burgandy Rot Met/Black Leather Lowered by Intrax on bilies, poly everywhere, B&B cat back system, K&N, and a hitch! Da Beast - Still running w/375k+! (2nd Owner)
    91 316i euro Tizianrot/Gray cloth - E-36 w/M-40 motor, such a beater, but great on gas! Best was 38 MPG (2nd Owner)
    82 528i euro Saphire Blue Met/Blue Leather RIP
    79 525 euro Green/Green RIP
    79 318 Silver/Black - The first one that got it all started
    M-Flight Member

  12. #12
    Join Date
    Apr 2018
    Location
    Nakskov, Denmark
    Posts
    5
    My Cars
    1999 BMW E46 318i Sedan
    I'll hit the mechanic with this list you gentlemen made me so he has a place to start. Truly appreciate the replies here.

    Sendt fra min ONEPLUS A5010 med Tapatalk

Similar Threads

  1. Replies: 10
    Last Post: 05-25-2012, 09:47 AM
  2. My car is makes a whistle noice when I press throttle
    By m5touringfan in forum 1996 - 2003 (E39)
    Replies: 34
    Last Post: 05-23-2010, 04:50 PM
  3. Whining noise when playing music
    By KJJ in forum 1992 - 1999 M3 (E36)
    Replies: 3
    Last Post: 09-04-2004, 04:57 PM
  4. stalling when lifting off throttle on custom SC
    By frankie1000 in forum Forced Induction
    Replies: 2
    Last Post: 07-27-2004, 10:06 PM
  5. how do i know when my throttle position sensor is bad ?
    By Dj Waffelz in forum 1991 - 1999 (E36)
    Replies: 0
    Last Post: 12-25-2002, 12:12 AM

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
  •