M52 deep oscillating sound, concerning?

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  • fastestbox
    Advanced Member
    • Jul 2018
    • 124

    #1

    M52 deep oscillating sound, concerning?

    My post swap e30 is making a sound that can't be described as anything but a deep vibrating wub that oscillates while it idles.
    It sounds like it is coming from the front bottom, however the car I took this engine out of had the same sound and it seemed like it was coming from the cowl area of the z3, maybe even upper transmission.
    I can't really hear it inside the car and it's not an offensive sound, I just want to make sure it isn't something I need to worry about?
    91 318iS - aluminum M52B28 + ZF320 + 3.15 Torsen
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