i noticed when i rev my engine to about 2K or 3K while still or moving when the rpms drop down to idle..i hear a clacking on the way down. I dont know what it is or why listen to the clip and u can hear it..especially the last time when i turn the car OFF when the rpms are dropping listen for the rattling/clacking noise.

http://media.putfile.com/Engine-clack-1

 

don't even worry about the valve train, your asking why? because thats what i thought when it happend to me. I was wrong and upon further inspection i found that the bank 2 cat. converter (radiator side) had broken free inside which caused a rattling noise. go to the dealer it is covered under the 8 year 80K mile factory emissions warranty. Parts are more than like to be on national back order like mine you'll have to wait like 2 weeks or so.

 

so thats all it is? just something inside of the cat? they wont say anything about me having a muffler on the car will they? but K2max...thank you VERY much for this info..im all worried that something is wrong inside of the engine or something..phew thanks again!

 

they can argue about a muffler but that so far downstream it doesnt matter plus what do they care its nissan that covers it.

 

crappppppppppppp... i was always wondering what the hell that noice was and i am at 80800 miles... omg...what do i do... will they cover that?

 

They Would Have 800 Miles Ago. Why Dont You Just Go And Ask, They Might Be Nice But Don't Count On It

 

ahhhhhhh whatever, i am planning to order cattman headers and greddy catback in a few months anyways....