4) i doubt you would be able to hear the valves, at these rpms and should never make noise anyway, as long as the car runs normally w/o drop in fuel economy, it is most likely a piece of plastic hitting a fan or belt. …. 2) Yes basically they are gonna do just what it says “check” your steering and suspension if they see any concerns they will give you an estimate to repair those items you don’t have to purchase anything i would recommmend getting a couple of estimate …