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  1. #1
    Join Date
    Nov 2013
    Location
    Bay Area
    Posts
    2,973

    I solved my clunking noise

    Posting this incase anybody in the future has a weird clunk they can't figure out.

    I had an odd clunk for quite a while. At first I thought it was suspension related, since it wasn't related to engine speed or vehicle speed. After poking all over the car for months, I gave up and took it to a mechanic.

    Dunno why I didn't catch this before, but it turns out the engine mounts were shot and the trans mounts were completely separated. I knew the engine mounts were bad, but never thought to check the trans mounts.

    My guess is that the clunk is from the transmission itself. I could feel it clunking through the floor boards. The clunk would only ever happen when the engine was under neutral load (meaning it wasn't accelerating or decelerating), which means there wasn't any torque on the two trans bushings, allowing the whole driveline to bounce.

    No damage to anything else. Replaced with M3 engine & trans mounts. Good to go. Car feels great.


    https://www.youtube.com/watch?v=VJ8y6wdH9v4



    His: 05 330 ZHP Imola Red - 07 Z4 M Coupe Imola Red
    Hers: 04 330i ZSP
    2004 325 M56 Steel Blue Metallic - Sold
    Stephen's DD & AutoX/HPDE Build Thread
    Stewart WP - Z4M LCAB - M3 trans/motor mounts - DICE MediageBridge Duo - ARC-8 17x8.5"
    DrVANOS - Mason Engineering Race Strut Bar - E30 Exp. Cap - Custom Black+Beige Interior - M3 Seats
    Bilstein PSS10 - Turner Sway Bars 27/21 - ECST RTAB Limiters - R.E. RSM


  2. #2
    Join Date
    Nov 2014
    Location
    Portland, OR
    Posts
    10,244
    Nice, glad to hear you solved your problem. Couple of q's:

    1. Do you have part numbers that you used for engine and trans mounts?
    2. Did you replace them yourself?
    3. If so, how difficult were they?

    Thanks for the video, definitely a very clear example of your clunk.

  3. #3
    Join Date
    Jun 2011
    Location
    VA/DC
    Posts
    14,445

  4. #4
    Join Date
    Nov 2013
    Location
    Bay Area
    Posts
    2,973
    Quote Originally Posted by BMWCurves View Post
    Nice, glad to hear you solved your problem. Couple of q's:

    1. Do you have part numbers that you used for engine and trans mounts?
    2. Did you replace them yourself?
    3. If so, how difficult were they?

    Thanks for the video, definitely a very clear example of your clunk.
    I had a shop do it so I don't know part numbers. They're OEM M3 parts, so you can look it up on ECST or real OEM.

    In terms of difficulty, I hear it's relatively easy.


    His: 05 330 ZHP Imola Red - 07 Z4 M Coupe Imola Red
    Hers: 04 330i ZSP
    2004 325 M56 Steel Blue Metallic - Sold
    Stephen's DD & AutoX/HPDE Build Thread
    Stewart WP - Z4M LCAB - M3 trans/motor mounts - DICE MediageBridge Duo - ARC-8 17x8.5"
    DrVANOS - Mason Engineering Race Strut Bar - E30 Exp. Cap - Custom Black+Beige Interior - M3 Seats
    Bilstein PSS10 - Turner Sway Bars 27/21 - ECST RTAB Limiters - R.E. RSM


  5. #5
    Join Date
    Nov 2014
    Location
    Portland, OR
    Posts
    10,244
    Thanks for the info. My clunking is getting worse but I have to get under the car to see if my diff mounts are shot and so forth.

  6. #6
    Join Date
    Nov 2013
    Location
    Bay Area
    Posts
    2,973

    I solved my clunking noise

    Yea check all the drive line and suspension mounts.


    His: 05 330 ZHP Imola Red - 07 Z4 M Coupe Imola Red
    Hers: 04 330i ZSP
    2004 325 M56 Steel Blue Metallic - Sold
    Stephen's DD & AutoX/HPDE Build Thread
    Stewart WP - Z4M LCAB - M3 trans/motor mounts - DICE MediageBridge Duo - ARC-8 17x8.5"
    DrVANOS - Mason Engineering Race Strut Bar - E30 Exp. Cap - Custom Black+Beige Interior - M3 Seats
    Bilstein PSS10 - Turner Sway Bars 27/21 - ECST RTAB Limiters - R.E. RSM


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