Mine does prolly the same things as yours. I have an F4 and been told its pretty normal to hear some chattering. Also could be coming from the cam chain tensioner. Which isnt necessarily a bad thing either. Will need to be replaced but you will know when it does. Will become really loud. Hope this helps

 

How many miles are on you f4 and has it been services as per the factory recommendations?

 

5000kms and yes its due for its first service