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Thread: Metal plate vibrating noise coming from bottom side E90 - Please listen to audio

  1. #1
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    Exclamation Metal plate vibrating noise coming from bottom side E90 - Please listen to audio

    hello members,
    i am new here, I just joined to seek help before I proceed to spend money, I bought this car with 95,000MILES, drives fine so far but there some issues with car,

    Car info: Type PG77 | Model 323i U1 | Development Code E90 (MUE) | year 2011 SEDAN
    Metal plate sound coming from bottom side, it only comes intermittently, its not happening permanently. Please listen to audio file.

    https://vocaroo.com/i/s0PJKewGTPjA

    Thank you
    Last edited by adm1n1strator; 03-20-2019 at 09:04 PM. Reason: updated info

  2. #2
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    Get under there and poke around.
    Are you gonna eat that?

  3. #3
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    Your best option is to get it up on a lift and observe where exactly the sound is originating from.
    If I were to guess, I would say a loose catalytic converter heat shield.

  4. #4
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    Quote Originally Posted by MIKYZZ4 View Post
    Your best option is to get it up on a lift and observe where exactly the sound is originating from.
    If I were to guess, I would say a loose catalytic converter heat shield.
    Thanks for replying, i just noticed in rainy weather at 7C, its still coming. I will get it lifted and check it out thanks again/
    | Model 323i U1 | Year 2011 SEDAN | Development Code E90 (MUE) | Type PG77 | Miles 95000

  5. #5
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    Sounds like a butter knife tapping on a fence post. Seems too solid for a heat shield. Check the exhaust mount bracket arm that attaches to the transmission.
    Quote Originally Posted by B4SH View Post
    If anyone knows, it's this guy who knows literally nothing about everything.
    Quote Originally Posted by fcvapor05 View Post
    Do you even OT? The mean 401k around here is probably about $6, what with all the shiny cars and $1,000 watches and donations to get other members' Volvos running.


  6. #6
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    Quote Originally Posted by Critter7r View Post
    Sounds like a butter knife tapping on a fence post. Seems too solid for a heat shield. Check the exhaust mount bracket arm that attaches to the transmission.
    Thanks a lot for replying, i will get it checked there too.
    | Model 323i U1 | Year 2011 SEDAN | Development Code E90 (MUE) | Type PG77 | Miles 95000

  7. #7
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    Unhappy

    Quote Originally Posted by MIKYZZ4 View Post
    Your best option is to get it up on a lift and observe where exactly the sound is originating from.
    If I were to guess, I would say a loose catalytic converter heat shield.
    Quote Originally Posted by relative4 View Post
    Get under there and poke around.
    Quote Originally Posted by Critter7r View Post
    Sounds like a butter knife tapping on a fence post. Seems too solid for a heat shield. Check the exhaust mount bracket arm that attaches to the transmission.
    Properties of noise


    - its like spoon hitting another utensil , please listen to audio link
    - it only comes intermittently, its not happening permanently.
    - Does not come when driving fast/accelerating car like above 40-45mph.
    - Comes always when idling or on slower speeds.


    After diagnosing, looks like its coming from somewhere near Alternator, below alternator, or around alternator. Not sure about that, but the area for noise source is somewhere there.

    I have tried following with my mechanic:

    1. Remove belt and only run engine alone, nothing connected to engine with belt and NOISE is GONE.

    2. Connect belt and noise came back.

    3. Replaced Idle pulley today and noise is still there.

    4. Check thoroughly under the car and exhaust as well and all is good below and with exhaust too.

    5. Alternator has 14.5v output, I am not sure if its alternator making that noise, I cant take risk for changing alternator, its too costly to just try.

    Please help me.
    | Model 323i U1 | Year 2011 SEDAN | Development Code E90 (MUE) | Type PG77 | Miles 95000

  8. #8
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    That didn't sound like an internal engine noise, so if the noise really is something related to the belt, it seems like it would have to be the belt tensioner itself (not the pulley). And it appears that the tensioner is right next to the alternator. Maybe the belt has stretched to the point where a failing tensioner contacts something when it bounces during operation.
    Quote Originally Posted by B4SH View Post
    If anyone knows, it's this guy who knows literally nothing about everything.
    Quote Originally Posted by fcvapor05 View Post
    Do you even OT? The mean 401k around here is probably about $6, what with all the shiny cars and $1,000 watches and donations to get other members' Volvos running.


  9. #9
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    Quote Originally Posted by Critter7r View Post
    That didn't sound like an internal engine noise, so if the noise really is something related to the belt, it seems like it would have to be the belt tensioner itself (not the pulley). And it appears that the tensioner is right next to the alternator. Maybe the belt has stretched to the point where a failing tensioner contacts something when it bounces during operation.


    I found a video from youtube which I can say matches my car,
    Only difference between my car noise and this youtube video noise is very bad

    My noise is soft and this guy's car noise is way too bad.

    https://www.youtube.com/watch?v=R3pzV2Bb8Xo
    Last edited by adm1n1strator; 04-02-2019 at 12:40 PM.
    | Model 323i U1 | Year 2011 SEDAN | Development Code E90 (MUE) | Type PG77 | Miles 95000

  10. #10
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    Does your also only happen when you turn the wheel?
    Quote Originally Posted by B4SH View Post
    If anyone knows, it's this guy who knows literally nothing about everything.
    Quote Originally Posted by fcvapor05 View Post
    Do you even OT? The mean 401k around here is probably about $6, what with all the shiny cars and $1,000 watches and donations to get other members' Volvos running.


  11. #11
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    With the belt off,and engine off also,
    attempt to spin by hand, every pulley that belt normally contacts.
    Listen for noise and feel for bearing smoothness.

  12. #12
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    Quote Originally Posted by Critter7r View Post
    Does your also only happen when you turn the wheel?


    I did not check it but I will check and let you know. Thx
    | Model 323i U1 | Year 2011 SEDAN | Development Code E90 (MUE) | Type PG77 | Miles 95000

  13. #13
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    if it does, I would replace the belt and belt tensioner.
    Quote Originally Posted by B4SH View Post
    If anyone knows, it's this guy who knows literally nothing about everything.
    Quote Originally Posted by fcvapor05 View Post
    Do you even OT? The mean 401k around here is probably about $6, what with all the shiny cars and $1,000 watches and donations to get other members' Volvos running.


  14. #14
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    Quote Originally Posted by Critter7r View Post
    if it does, I would replace the belt and belt tensioner.
    Sorry I forgot to mention, but I have already got belt tensioner pulley replaced.

    So,
    1. Belt tensioner replaced.
    2. Tried new Idler pulley as well.
    | Model 323i U1 | Year 2011 SEDAN | Development Code E90 (MUE) | Type PG77 | Miles 95000

  15. #15
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    The "belt tensioner" and "belt tensioner pulley" are 2 different things. Did you replace the assembly? Or just the pulley?
    Quote Originally Posted by B4SH View Post
    If anyone knows, it's this guy who knows literally nothing about everything.
    Quote Originally Posted by fcvapor05 View Post
    Do you even OT? The mean 401k around here is probably about $6, what with all the shiny cars and $1,000 watches and donations to get other members' Volvos running.


  16. #16
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    Or just one of the two idler pulleys?
    Are you gonna eat that?

  17. #17
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    Quote Originally Posted by relative4 View Post
    Or just one of the two idler pulleys?
    The 323 only has one. (At least, looking at RealOEM, that's how it appears).
    Quote Originally Posted by B4SH View Post
    If anyone knows, it's this guy who knows literally nothing about everything.
    Quote Originally Posted by fcvapor05 View Post
    Do you even OT? The mean 401k around here is probably about $6, what with all the shiny cars and $1,000 watches and donations to get other members' Volvos running.


  18. #18
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    yes, I changed this part

    https://www.ebay.com/itm/For-BMW-OEM...-/361179958292


    thanks

    - - - Updated - - -

    Quote Originally Posted by Critter7r View Post
    The 323 only has one. (At least, looking at RealOEM, that's how it appears).
    I found that sounds goes away above 1700 RPM when idle or driving. It comes back below those RPMs
    | Model 323i U1 | Year 2011 SEDAN | Development Code E90 (MUE) | Type PG77 | Miles 95000

  19. #19
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    Did you check the crankshaft vibration dampener when you had the belt off?

    I still think the noise is coming from the tensioner, but it could be caused by backlash of the belt due to a bad dampener. The engine smoothes out naturally at higher RPM.
    Quote Originally Posted by B4SH View Post
    If anyone knows, it's this guy who knows literally nothing about everything.
    Quote Originally Posted by fcvapor05 View Post
    Do you even OT? The mean 401k around here is probably about $6, what with all the shiny cars and $1,000 watches and donations to get other members' Volvos running.


  20. #20
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    Quote Originally Posted by Critter7r View Post
    Did you check the crankshaft vibration dampener when you had the belt off?

    I still think the noise is coming from the tensioner, but it could be caused by backlash of the belt due to a bad dampener. The engine smoothes out naturally at higher RPM.
    I got the Steering fuel pump replaced and the noise is gone. Hopefully, it wont back.
    | Model 323i U1 | Year 2011 SEDAN | Development Code E90 (MUE) | Type PG77 | Miles 95000

  21. #21
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    thanks for the update!
    Quote Originally Posted by B4SH View Post
    If anyone knows, it's this guy who knows literally nothing about everything.
    Quote Originally Posted by fcvapor05 View Post
    Do you even OT? The mean 401k around here is probably about $6, what with all the shiny cars and $1,000 watches and donations to get other members' Volvos running.


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