After some careful observation, I have noticed that there is a very unique rattle around 2000rpm. So far, I have only noticed the rattle after cutting acceleration and letting the engine slow the car down - as the rpms slowly drop, the rattle shows up around 2000rpm and stops shortly after.

A while ago, I had the clutch and flywheel replaced under warranty because it was making a similar noise when engaging into first from a stop-to-start situation.

Thoughts?

2003 6MT Stock 58K miles

 

Is it kind of a
rat a tat tat?
or more like a
tat tat tat?

 

brrrr rat tat tat

 

Haha I guess it's hard to say... Sounds like metal on metal rattling/chattering. Only occurs for about a second - right at 2000rpm, then stops.

Also, congrats the the 370Z davidv, saw it in the new area - looks good!

 

Coming from under the car? Could be the element in one of the cats.

 

It does sound like it is coming from underneath of the car... you may be on to something

 

Mostly like exhaust system leak specially if you have the OEM Y-pipe, mine had the same problem. ended up with changing my catback system .