Squeaking noise from engine

[xrgeorg]

So i just figured out that it´s also there while driving, but only when releasing the throttle and just letting it roll.

But sometimes it squeaks and sometimes it don´t

I´ll check the alternator belt tomorow. Can it also squeak when it´s too tight

Should i also check the timing belt - i actually thought that it can´t squeak because it can´t slip...

On the other hand i don´t think it´s the alternator belt, this would be louder.

Damn...