1500 to 2000 rpm sound

Hello friends, my car 307 sw 1.6 gasoline 1500 2000 rpm engine comes with a hum, generally I thought that the car is cold, but when it is idle, when the throttle is pressed, there is a sound in the same speed band.

What other information did you change last time? one has to look at the v-belt and its bearings.

the timing has changed 10 thousand km ago, it is a moving part.

I gotta look at moving parts. bearings and pulleys.

https://youtu.be/EwvbcS1nNS0 voice this teacher is very disturbing

teacher, it seemed like an exhaust leak Have a look at the manifold gasket or something and when it gets out of the connection with the exhaust, it can do so. Obviously, it sounded like that, but those who know will help.

manifold and gasket complete exhaust system has changed from front to back, I do not think it will be from it