Motor, Transmission and Diff rubber mounts to solve rocking?

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  • bryant.cw
    Wrencher
    • Jul 2007
    • 209
    #1

    Motor, Transmission and Diff rubber mounts to solve rocking?

    Has anybody replaced these to eliminate any bucking/rocking in the drivetrain?

    Lets say I'm in 1st gear at 5mph walk, and press on the gas, the car kinda lurches back and forth a couple times before it smooths out. I have to either slip the clutch or tip into the gas very smoothly. Has anybody had this problem? Can refreshing this old rubber help resolve that? Urethane? Things that make the car seem poorly maintained or crappy really piss me off, but so does replacing something to no avail.

    Thoughts?
    Tags: None
    • StereoInstaller1
      GAS
      • Jul 2004
      • 22679
      #2
      If yours are shot, replace them.

      If not, time to troubleshoot the problems!

      Closing SOON!
      "LAST CHANCE FOR G.A.S." DEAL IS ON NOW

      Luke AT germanaudiospecialties DOT com or text 425-761-6450, or for quickest answers, call me at the shop 360-669-0398

      Thanks for 10 years of fun!

        Comment

        • jlevie
          R3V OG
          • Nov 2006
          • 13530
          #3
          That sounds more like uneven power delivery than a bushing or drive shaft problem. Small intake leaks would be my first suspicion.
          Last edited by jlevie; 03-24-2010, 04:34 PM.
          The car makes it possible, but the driver makes it happen.
          Jim Levie, Huntsville, AL

            Comment

            • qbuilt
              Member
              • Jun 2007
              • 94
              #4
              Sounds normal for Motronic! If you have slop in the drivetrain, you will notice it alot more if your lugging the car. But replacing bushings wont fix the problem. You might have a bad coolant temp sensor or something if it only does it when cold, otherwise maybe you just need to learn to drive around it! Pretty much every e30 Ive driven will do this, its just one of those e30 things.

                Comment

                • bryant.cw
                  Wrencher
                  • Jul 2007
                  • 209
                  #5
                  Yeah, it does feel kinda like the motor surging to be honest. Rubber should be pretty tight tho. I'll look into it. Maybe shoot some starter fluid around.

                    Comment

                    • jlevie
                      R3V OG
                      • Nov 2006
                      • 13530
                      #6
                      The only reliable method of locating intake leaks is to have a smoke test run on the intake and crank case and to test the brake booster with a gage and vacuum pump. The complete list of possible causes of an intake leak is:

                      Intake boot
                      Throttle body gasket
                      ICV hoses & connections
                      Brake booster, hoses, and connections
                      Crank case breather hose
                      Evaporative control hose and valve
                      Fuel pressure regulator & hose
                      Injector seals
                      Valve cover gaskets & bungs
                      Oil filler cap
                      Dip stick o-rings
                      Oil return tube o-rings

                      While leaks in some of those can be found by inspection or by spraying carb
                      cleaner on suspect areas, not finding leaks that way doesn't eliminate the
                      possibility. Only a smoke test will really work.
                      The car makes it possible, but the driver makes it happen.
                      Jim Levie, Huntsville, AL

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