Engine vibrates/shudders when hitting boost

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  • ovo_e30
    Noobie
    • Aug 2020
    • 30
    #1

    Engine vibrates/shudders when hitting boost

    I recently had an issue with my turbo m20. Whenever the boost gauge crosses from vacuum into boost (under load) it shakes the engine/car pretty harshly. If I accelerate smoothly at 30-40% throttle through the entire RPM gauge (in vacuum) no issues, however, the second it crosses atmospheric and goes into boost even slightly, the engine vibrates.

    This happened after I replaced my C191 connector (fuel injector connector). I checked my TB, BOV, and all vacuum lines that I removed to get to the harness. Nothing looked ‘off’. I replaced my spark plugs with a fresh pair thinking it was an ignition issue, but nothing changed the symptoms. My car does idle smoother though :)

    Any ideas guys. I’m kinda lost with what else it could be. Clutch maybe?
    Tags: None
    • atmh
      Advanced Member
      • Sep 2004
      • 165
      #2
      Driveshaft center bearing maybe? That tends to vibrate/shudder/knock, usually only when the engine is under load (accelerating from a stop, etc.) Doesn't have to necessarily only be under boost, but I bet it would show up first under boost.

      Is it worse in first gear? or does it not really matter?

        Comment

        • ovo_e30
          Noobie
          • Aug 2020
          • 30
          #3
          The gear doesn’t matter. It’ll happen in all of them if the engine goes into boost.

            Comment

            • ADEN
              Mod Crazy
              • Feb 2008
              • 620
              #4
              Log your ecu you may need tuning or your map sensor is acting.

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