Engine noise. What could it be?
 

I've been hearing this noise since last year. I thought it was a loose panel but it seems its coming from within the engine. click image for video.

http://i541.photobucket.com/albums/g...20VIDEO%20.mp4


Here is a youtube video. It seems the the chain guide.
<iframe width="420" height="315" src="https://www.youtube.com/embed/uXRucQKh8ew" frameborder="0" allowfullscreen></iframe>

Loose panel???? Sounds pretty normal for a diesel, but I'm guessing yours isn't a diesel?
Noisy/sticky valve perhaps. Definitely sounds like it's coming from the top end of the motor. Does the ticking noise increase in frequency when the engine revs are increased, or does it stay constant? If this is engine related (increases with revs) then I would start with an oil change, perhaps introducing an additive for sticking valves, running the car for a say 100 miles, then flush out and do again. Pretty hard to diagnose from a short video, but sure sounds like a valve to me.

The noise stays constant. Car is a 4.8is.

The YouTube video suggest a rail guide . I don't know.

Most likely a rail guide if it sounds like a light rattle. Get it fixed right away because I just had one go on my X5 and the result is engine damage and lot higher repair bill.

That sounds nasty.