Recently purchased Audi A4 2010 with 147000km, has a juddering when accelerating, smooth in all other respects, I cleaned the mass air flow sensor, checked the spark and coil packs, one coil pack is a different design from the others and I am having trouble removing the third spark plug.

Any assistance would be appreciated

  • poet3991@alien.topOPBEnglish
    1·
    10 months ago

    Checked the obd2 codes came with a misfire in the third cylinder, I checked the coil and spark plug, they where very old and the rubber bottom was stuck to the top of the plug, got it removed eventually and ordered a new coil and plug set, hoping that would fix it. Could a bad coil and/or spark plug cause juddering when accelerating?

    • Gunk_Olgidar@alien.topBEnglish
      1·
      10 months ago

      Overgapped or worn plugs can misfire at high rpm.

      Pro tip: if you have CEL codes, always put them in your OP so folks like us have a better clue what’s going on with your ride.

      • poet3991@alien.topOPBEnglish
        1·
        10 months ago

        sorry its p0303, could it also be the coil, that was the oldest and broken