I found out at a cold start that I had a strange ugly engine sound instead of the sweet purr it used to be. I made a video after a cold start, at idle : Bruit étrange moteur - YouTube
I’m a bit worried something bad happened to the engine. FYI, I changed the calorstat and the alternator + belt recently. But I don’t know if there’s a link.
Do you have any idea what’s going on ? Thanks a lot.