hey guys, last few days my fg turbo developed this knock/tick on idle, iv searched multiple forums and threads and haven't come across something similar to this, its been to the mechanic twice and they cannot fault it and/or haven't heard the noise, it sounds like its coming from cylinder 1 or the timing cover, its got me stumped because its intermittent, doesn't increase with revs, just sounds like something is knocking around inside and I got no idea. if anyone had this before or has a rough idea of what it could be that would be awesome because its got me stuffed. for some reason I cant upload a video so here is a link to youtube videos, cheers.