To complete first video, a new one with white smoke and water.
Engine just arrived at 80°c / 176°F. We can see smoke during idle and nothing during acceleration.
The fuel tank has been same during long years. I am trying to add some of Bardhal to dispear water inside the tank.
I believe that's fuel problem. And You ? Do you hear something wrong ?
https://www.youtube.com/watch?v=piLlArJ9_Nc