strange rattling

[mbagge01]

My 04 cayenne turbo has about 62,000 miles on it and over the past couple of weeks it has started to develop a strange rattling underneath the car on the drivers side. It seems to mainly happen under moderate load when the car first starts up but as it warms up, it seems to go away as I can hit WOT later on and it is not there. When it happens I can feel it on my feet as if it is right underneath the driver floorboard. I have looked underneath the car and I pushed things around and nothing seemed obviously loose. I do have secondary cat delete pipes but the mounts are solid and not moving. I would be curious if anyone has experienced anything similar or have ideas about what this could be. It sounds like a metal on metal sound. I also looked in the wheel well and nothing unusual that I can see.

[ekstroemtj]

Did you check this:

http://www.renntech.org/forums/topic/24323-cayenne-driveshaft-vibrations/

[odix]

ekstroemtj nailed it: it's your drive-shaft. Your description is the exact same for my vehicle (2004 Cayenne S) as the shaft slowly failed. The threads noted above will sort you out. Good luck. In my case I was under CPO so the dealer took care of the replacement.

Edited December 30, 2012 by odix

[mbagge01]

I was thinking about that also but I check the carrier for it and moved it around and everything seemed pretty solid. The reason it don't think it is the driveshaft is why would it go away when the car warms up and I can hit wot and it does not happen which is when I would think the driveshaft is under the most stress.

[mbagge01]

The one other question I have is would not the problem be a vibration as oppose to a metal on metal rattling sound that I am hearing and feeling?