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Thread: 2007 x3 e83 loud knocking sound at hard acceleration.

  1. #1
    Join Date
    Feb 2018
    Location
    Canada
    Posts
    3
    My Cars
    2007 x3

    2007 x3 e83 loud knocking sound at hard acceleration.

    Hi, my x3 makes this sound when I accelerate, I made a video please watch it and let me know what you think it might be;
    I already changed flex disk, drive shaft center support mount, new oil in differentials, new oil in transfer case.
    Car still vibrates at over 60km/h and still has rear knocking sound.



    Thanks!
    Last edited by kosmos3d; 02-26-2018 at 02:43 AM. Reason: added slow motion to video

  2. #2
    Join Date
    Dec 2013
    Location
    Chicagoland area
    Posts
    4,372
    My Cars
    EXOTICS
    That sure sounds like a backfire/misfire problem,
    caused by the sudden & hard acceleration,
    with the popping/knocking sound being emitted by the rear muffler.

    This may be just me, but l would definitely check sparkplug conditions and gaps,
    if showing wear or age-Replace, along with a diagnostic scan for good measure.

  3. #3
    Join Date
    Feb 2018
    Location
    Canada
    Posts
    3
    My Cars
    2007 x3
    Quote Originally Posted by MIKYZZ4 View Post
    That sure sounds like a backfire/misfire problem,
    caused by the sudden & hard acceleration,
    with the popping/knocking sound being emitted by the rear muffler.

    This may be just me, but l would definitely check sparkplug conditions and gaps,
    if showing wear or age-Replace, along with a diagnostic scan for good measure.
    Thanks for the reply! I am not sure it sounds like backfire, to me the sound is more mechanical sound, like gear hitting other gear or metal, maybe wheel bearing/hub, or cv joint is my guess.. or differential needs to be rebuild or transfer case belt is loose..
    in snow and ice when the wheel is slipping and i apply enough gas it makes even more knocking

  4. #4
    Loose or broken suspension piece or exhaust bracket. Get it up on a lift and look at it.

    Sent from my SAMSUNG-SM-G930A using Tapatalk
    Using Tapatalk

  5. #5
    Join Date
    Feb 2018
    Location
    Canada
    Posts
    3
    My Cars
    2007 x3
    Quote Originally Posted by dano1200r View Post
    Loose or broken suspension piece or exhaust bracket. Get it up on a lift and look at it.

    Sent from my SAMSUNG-SM-G930A using Tapatalk

    Thanks for the reply. I will definitely inspect the suspension.
    *I added slow motion to video to make the sound more audible*

    Last edited by kosmos3d; 02-26-2018 at 02:45 AM.

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