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  • Wierd vibration

    At about 2800-3200 RPM I am getting this odd vibration coming from the rear end. I think it may be a wheel bearing back there, but it's getting louder and louder. Driveshaft perhaps? The level of noise corresponds to RPM. Any help? Cheers.
    1988 M3
    2012 335is
    1993 Civic Si

  • #2
    It could be the center support bearing may be the the problem? Does it always vibrate the same at these RPMS? You could try driving up a steep hill (and down). If it is affected then you may have the driveshaft/ support bearing problem. You may need to replace it. There is a difference between year models, so make sure you get the correct one if this is the case.
    What about Rear tranmission mounts?

    I say put it on the a lift and inspect it by eye. See if the drive shaft moves more than it should.

    Good luck


    Disclaimer: Remember, I know absolutely nothing, but it doesn't prevent me from having an opinion or suggestion. :

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    • #3
      I'm currently having this exact same problem with my car. It vibrates at those exact same rpms, though only when I decelerate. It started after I replaced my flexdisc, which was a couple weeks after I had put in my new tranny and clutch, but I thought it was my rearend making noise since I had been beating the hell outta the car with the new kevlar/organic clutch.

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      • #4
        Thanks Magnus--I'll throw her up on a lift in the morning.
        1988 M3
        2012 335is
        1993 Civic Si

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        • #5
          A few things to check...flex disc, center support bearing and the often overlooked U joints.

          88 M3 - LACHSSILBER/M TECH
          89 M3 - ALPINEWEISS II/SCHWARZ
          85 323I S52 - ALPINEWEISS/SCHWARZ
          91 M TECHNIC TURBO - MACAOBLAU/M TECH


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          • #6
            I have the nasty vibration truck decel sound at 3000-2200 RPMs upon lifting my foot from the accel. Did an inspection of the drive shaft and play and it was fine. New Guibo, all new shifter components, good motor mounts and tranny mounts. Cannot figure out what it is. Best guess is that its a rear diff thing. When letting up, it torques it somewhat and causes the problem. So, at least I can tackle that area next.

            CT

            Please let me know if any of you guys solve your problems. I'll let you know my outcome eventually!

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            • #7
              Barry are you going to the PCC meet tomorrow morning?
              1988 M3
              2012 335is
              1993 Civic Si

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              • #8
                If it is the center support it NEEDS to be preloaded! You DO NOT want it smacking off the gas tank!

                I'll look up the proceadure for it.

                Do not click
                At least it's German

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                • #9
                  Preloading center support bearing

                  "From its relaxed position, push it about 5mm towards the front of the car and tighten the bolts."

                  Information courtesy of Brett Anderson via the SIG.

                  90 Sterling 2.5L E30///M3 lifer
                  97 Porsche Carrera S
                  13 Audi S6
                  SOLD 03 Audi RS6 daily
                  GONE 88 E28///M5 project

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                  • #10
                    Re: Preloading center support bearing

                    Originally posted by SeattleE30///M3
                    "From its relaxed position, push it about 5mm towards the front of the car and tighten the bolts."

                    Information courtesy of Brett Anderson via the SIG.

                    Ahh, I will try that and see if it fixes the vibration. Thanks for the tip.

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                    • #11
                      Originally posted by einhander
                      Barry are you going to the PCC meet tomorrow morning?
                      Not if it's raining.

                      88 M3 - LACHSSILBER/M TECH
                      89 M3 - ALPINEWEISS II/SCHWARZ
                      85 323I S52 - ALPINEWEISS/SCHWARZ
                      91 M TECHNIC TURBO - MACAOBLAU/M TECH


                      Comment


                      • #12
                        I had a pretty bad vibration at around 2000-3500 RPMs when accelerating in first and second really bad. It turned out I needed my driveshaft rebuilt badly. I had it rebuilt and it works perfect now.

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