Hi all lovers of A2 1.6Fsi. I bought my A2 2 years ago. After first basic maintenance I found engine start to hesitate when warm, very low load (90°C, 1800-2000rpm) and mainly at 4th gear, called stratified charge mode. When engine is cold or under the load everything is OK. VCDS say no error code. SO I started to find what is wrong and replace all possible faulty parts. I changed - fuel filter and fuel pump, spark plugs, all ignition coils, coolant temperature sender G62, intake manifold flap air flow control valve N316 and all connections, air-mass flow meter G70/G42. I perform smoke test for faulty hoses, check EGR valve and EGR tubes, perform throttle valve cleaning and adaptation, EGR valve adaptation, intake manifold flap adaptation, fuel trims adaptation/check, perform fuel injection cleaning using petrol additives, perform cleaning of inlet camshaft timing adjustment valve N205. Finally I was completely frustrated. Last thing I did, disconnect hose from solenoid valve N180 (activated charcoal filter) and close particular inlet for test drive. For my surprise hesitation decrease to be hardly readable (hard to feel). Of course behavior of the engine was little bit strange - increased idle rpm for second from time to time, but it was due to the expected opening of the solenoid valve and flow of air-fuel from charcoal filter to the intake manifold. After replacement of this solenoid valve N80 hesitation under the low load at low RPM disappeared and engine run very smooth. I hope this can help somebody with similar symptoms.
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