i have this problem.. ok when i start my car i have this kinda knocking sound that is coming from under the car.. (not uder the hood) and when i push the clutch down it completely goes away no noise at all..i think it has something to do with the clutch but my clutch feels great no slipping and still prety stiff and ideas what it could be?

 

sorry for posting without searching first but i searched and found this
https://my350z.com/forum/showthread....ghlight=clutch
now would this be the samething i am hearing?? the reason i ask that is b/c i can hear mine at idle??
thanks
chris

 

That would be my first guess as to the source of your problem.

 

thanks man

 

its not a problem.. just the sound this car makes... the dual mass flywheel actually gets rid of most of it... when you put on a single mass flywheel it sounds like a cement grinder...