I have a valve train noise in my 1990 535 that is making me nuts! When I "blip" the throttle I hear a clatter just before the engine settles back to idle - there is no unusual valve train noise when the revs are up. I am not taking the revs to the redline - only to about 2000 to 2500 rpm. To my ears it sounded like loose valve clatter so I adjusted the valves - no change. Could this be a timing chain tensioner problem?

Any leads/ideas will be greatly appreciated!

Thanks!
Don