I notice on my 2001 F4i that between 5000-6000 revs i get an ugly rattling noise.
Its nothing major, just doesnt sound very good, its like theres a plastic piece loose down by the engine, but i cant see or feel anything obvious when i look myself.

Is this common? Am i being paranoid?

 

Cam chain tensioner ???? Look at the sticky above your thread.

 

sticky sticky sticky

 

cccccccam chain tensioner lifter, all the cool kids replace theirs.

 

PLEASE NOTE THE CCT STICKY AT THE TOP!

 

I haven't replaced mine and don't plan to. Lots of guys on here have some fairly high mileage on theirs without having replaced them. They are ANNOYING though!!

 

Wicked...it seems unanimous....cam chain tensioner it is!