Title pretty much explains it all. It only seems to happen when in any gear at lower RPMs while accelerating. It doesn't make the noise when I let go of the gas to cruise. and it goes away at high RPMs. Any ideas?
I put it on the lift today and tried banging on the cat....nothing. No CEL either.what could it be? heat shield mabye?
any ideas or suggestions would be appreciated.
oh my car has 137,xxx miles.

 

Is it detination that you are hearing? Almost like marbals in a tin can?

 

Its not really that loud. definetly noticable though. And i dont think it sounds like marbals in a can.

 

Look for small cracks near the bolt hole of the heatshields. That was the source of one of my rattles.