Please help! Will my engine blow up??

[pureflames]

Hi everyone

I have a 2007 E70 3.0si which was delivered to me in Oct 2006. I haven't had many major problems with it until yesterday, when my wife reported that after stopping the car and removing the key and exiting the vehicle, there was a very loud sound (she said it was like a jackhammer going off) coming from the engine area for about 30 seconds.

Given that my warranty was about to expire last fall 2010, I had the lifters replaced in Nov 2010 to address the intermittent "metalic" ticking noise that was occuring on start up. (This procedure is more fully described by Tae in http://www.xoutpost.com/bmw-sav-foru...ld-starts.html). This is the only major work that has happened to the engine of the vehicle. I own the X5 and this obviously has both my wife and I concerned. I did open the hood and noticed that a piece of insulation/weatherstripping had fallen off from somewhere.

Does anyone 1) have any idea what the 'jackhammer' sound could be and 2) has anyone had the lifter replacement service and experienced a louder engine rumble sound at idle [at stoplights or even on startup] -- this is the other change I noticied since it came back from service is more engine noise in the cabin.

I would just like to be armed with some info from the community prior to visiting the dealer. Thanks for any relevant feedback.