Hello,

All this problem started like this: some time ago in order to start engine i needed to turn key two times. First time engine makes some revolutions and starts for a second and shuts down. After this i turn key second time and it starts perfectly. Situation changed: now when engine is cold i turn ignition key, engine makes like 15 revolutions without start and starts( so really long start which is draining battery and shortening life of starter) . Not all cylinders start at once, they come in one by one in few seconds. No check engine lights , nothing unnusual , fuel consumption is normal, engine works without any issues when started at any RPM .

Fuel pump slowly degrading ? Temperature or other sensors? Any ideas guys?

 

Noticed any decrease in performance? Check the ECU wiring. Listen if the fuel pump starts working immediately when you turn the ignition on. It's better to listen when rear seat is removed.

 

No decrease in performance . Spark Plugs are iridium and drove only 50 000 km. , spark plug wires are original, but car has only 231 000 km, so should be still good. And i hear buzzling under seat right afteri turn the ignition.
I think it will be mysteriuos case for some time till car won't start at all.