2006 MCS rattle/knock at startup etc. (prob not chain tensioner)
 

Hey Crew,

Looking to buy my second R53 - check out an otherwise immaculate 2006 R53 with only 50,000 on the odo, 1 owner!

The bad news, it has a funky knock and rattle that I haven't personally heard before...

You hear it right as the car turns over "wap wap wap" and then it pretty much goes away at idle... if you rev up to 1500 or so u can hear it audible again, and then also audible when he engine is under load... I drove the car around he block... does not have loss of oil pressure and does not seem to suffer much if at all on power delivery...

I have attached a couple videos, would love to at least get a few ideas in he hopper on his one.

Thanks so much!