Golf 5 1.4 BUD Misfire 2. Cylinder (Solution)

Hello everyone,
Limited experience in interpreting combustion interruption events. Cylinders in the 1.4 engines of Volkswagen vehicles, featuring individual spark ignition coils.

My Golf started running a bit rough at idle about two weeks ago when starting, but only for the first 20 seconds; afterwards, the engine ran smoothly, and no warning light came on, so I continued driving. I still quickly checked the error memory with VCDS at home, just to be sure - no errors found.

However, the occasional brief hesitation during startup persisted, so I immediately ordered 2 ignition coils (they're bound to fail eventually anyway) and 4 new spark plugs, just to be on the safe side.
However, the error memory remained empty, and this persisted for several days.

When the engine started misfiring even while driving, I thought to myself that I would install the new ignition coil that evening, and it would run smoothly again.

Meanwhile, the MKL (likely a diagnostic system) was also activated, and there were 2 error memory entries indicating combustion interruptions. Cylinder and lambda control system: mixture is too rich.

"I then removed the spark plugs and immediately noticed that the second one..." The spark plug was "wet" and black, indicating an incomplete combustion or excessive fuel injection.

So, I removed the fuel distribution rail and quickly found the mechanical fault on the injector - the front part, which is responsible for atomization, was completely missing.

"I took the opportunity to replace the seals on the other three fuel injectors as well, and I also changed the spark plugs again (they had been installed for about 11,000 km)."


The pictures should explain the rest relatively well .

Thank you for the feedback .