Hy Coure Sportivo 155, hy losa,
this is what I was looking for ! Thanks a lot !!
The mechanism on my car moves freely about 10mm. It springs back, but not the whole way up (I remember that I was able to press it further upwards some weeks ago and it moved unwillingly another 10mm, making squeaking noise. Now that's no longer possible, mechanism seems to be blocked after the first 10mm of movement).
I think the diagnosis "jammed VTG vanes" is clear now (I already changed VTG selenoid).
I'm going to clean the mechanism or replace turbo, depending on condition.
I'll post an update when done...