A2 Engine Misfire Fix: Service Shop & Cost Guide

Had nearly identical symptoms on my A3 2002 gasoline model. The rough idle and power loss turned out to be a fuel injector issue combined with combustion misfire. The throttle response problems were exactly as you describe, jerking during acceleration and unstable idle. The diagnosis showed a clogged fuel injector that was causing incomplete fuel delivery to one cylinder. This created an imbalanced combustion pattern, triggering the engine light. The repair involved: Testing all fuel injectors, Replacing one defective injector, Cleaning the remaining injectors, Replacing the ignition coil on the affected cylinder, Full system diagnostic to ensure no related issues It was a serious repair that required specialized equipment for proper fuel injector testing and calibration. The car ran perfectly after the fix, with smooth acceleration and stable idle restored. These symptoms typically worsen if left unaddressed and can damage other engine components. The repair should include a full diagnostic scan first, as cylinder misfire codes will point to the specific cylinder causing trouble. This helps narrow down whether its the injector, ignition coil, or both requiring attention.

Thanks for sharing your experience. I had a very similar issue with my A2 last winter. The check engine light came on and I noticed jerky acceleration plus rough idling. My fuel injector was indeed the culprit, but the mechanic also found a cracked ignition coil that needed replacement. The whole repair sorted out the combustion misfire problems completely. How much did your fix end up costing? Has everything stayed running smoothly since the repair? My total bill was quite steep but curious how it compares to what others paid for similar work.

Good to hear you got it sorted. Yes, the repair completely fixed the combustion misfire issues on my A3 and the car has been running flawlessly since seeing the mechanic. The rough idle disappeared instantly and the check engine light has stayed off. The total cost came to 515 Euro for replacing the defective injection valve, which seems in line with what others pay for this type of repair. The diagnostic scan was crucial in pinpointing the exact cylinder causing the engine misfiring troubles. While it was a significant expense, preventing further engine damage made it worthwhile. The mechanics did a thorough job testing all fuel delivery components to ensure no other issues were lurking. The smooth acceleration and stable idle confirm they found and fixed the root cause.

I took my car to a new mechanic after getting recommendations from this forum. The total repair came to 480 Euro, which included replacing the faulty fuel injector and spark plug, plus a full diagnostic scan. The fuel pump was tested but worked fine. The engine misfiring symptoms cleared up right away. No more rough idle or jerky acceleration, it runs like new again. The mechanic walked me through everything they found and even showed me the worn parts they replaced. Much better experience than my usual shop. Glad I switched mechanics and got this fixed before it could cause more engine damage. The car has been running perfectly for 3 months now with no check engine light or performance issues. Money well spent considering how smoothly everything runs now.