I'm getting a very strange, and I mean strange, never heard before noise coming from the top end by the cams. It's a cross between a rattling, clicking, fluttering, and a early 90's diesel noise. It Doesn't do it all the time, it doesn't most after a good 15 mins or so, but when you drive it hard it's fine. I'm thinking it's the cam phaser, but I have never heard one going bad.
What do you guys think?
Thanks.