I have a 2003 350z with 100,XXX miles on it. Lately I have been hearing a rattling noise when accelerating. It mostly happens around 2,000 and 3,000 rpm. In the freeways it goes away. When the car is idle in park it does not make the noise, but when I rev the rattling comes back. This is driving me crazy, does anybody know what the problem might be?

 

blinker fluid......

if it were me, i would check the cats to make sure that the honeycomb inside it isn't busting up

 

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with the car being 12 years old, it is very possible that they honeycomb could be breaking apart and some of it fell into the y pipe which would cause the rattling.... but at the same time it could be just rattling in the cat itself. rattles are the worst to try to find honestly

 

Hahahaha that brightened my day, okay I am gonna check the cats. Could it be that they're loose or anything like that?

 

and yeah also, i would check the mounting and to make sure they aren't hitting on something.

 

I had a ticking/rattling sound in high rpm's. I thought it was a piston making noise or maybe a bearing going out. Turns out the bushing in my TWM shift **** was a little loose and was rattling.

 

rattles are hard to track down

 

Yeah I figured, I know as a fact its not the engine or transmission. I believe It has to have a connection with my exhaust pipes or something down there. My brakes squeak too when I break softly but I don't believe that there is a connection between those two.

 

when i had an strange noise (turned out it was exhaust leak). i got the car up on four jackstands, had a friend get in and start it while i was under it to track it down

 

Yeah I am going to do that but I haven't found the time. Hopefully today I can

 

Did you find out what the issue was?

 

mines 15 and ive owned it for 6 of those years. been rat'lin since day one ayuh

 

There are a ton of rattling threads. I have a rattle that makes noise around 2,800rpm and it seems to better on some days. I have taken measures and inspected a lot of items as prescribed in the threads. The thing that made the most difference was adjusting the trunk latch downwards (or toward the front of the car).