X5 diesel engine noise - With VID.

[boredincl]

Originally Posted by Dr. Anthony

Good luck! let me know how it goes.

OK, So its resolved! well more or less.. With the small turbo off I was able to see the top stud on #1 cylinder was broken off! i spent the day yesterday drilling and tapping it (after buying a 90deg air drill small enough to get in there, nice drill bits and a set of easy-outs of course) once that was done i decided to check the bottom stud on #1 and when i tried to see if it was tight by applying maybe 5lbs of pressure it fell right out, broken off in the head. The top bolt pulled the manifold tight the head nicely and hopefully will do its job and keep it there so i don't have to replace the lower stud,
the noise is gone and it seams to have more boost since its not blowing out the manifold.
I bought this 09 X5 used and per the service records BMW was the only one working on it before i bought it with 74k miles. No mention of them working on or near the exhaust manifold other then replacing the DPF, EGR cooler and SCR which they don't need to remove the manifold for that so not sure if the studs just fatigued over time and snapped maybe due to the manifold twisting or such or that a mechanic took it off for some other reason and over torqued them.

Thanks again for the help!