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
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If it’s ONLY vibrating while accelerating, not when coasting, and vibration gets worse & faster with higher vehicle speed… then have the CV joints in the axles inspected.
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?
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.
Can You read OBD codes? Check the last spark plug. Sometimes They look not bad but make problems.
Checked the 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?
Yes it can