Thumping under driver side floorboard

[timojd]

I have a 2010 Base Cayenne with 60k miles. I recently started to feel some thumping under my feet while driving. I can feel the thump while it is in Park as well. My initial thought was the cardan shaft, but I am not certain. 

Does anyone have any suggestions? 

Thank you

[rik881]

Have you changed transfer case fluid yet?  Might be wrong fluid in it.

[Loren]

Sorry, most likely is the cardan shaft.

[rik881]

On 5/18/2018 at 8:22 PM, Loren said:

Sorry, most likely is the cardan shaft.

 

But how can you feel either when in Park?

[ciaka]

If you are at standstill, and start accelerating slowly, you will begin to hear and feel clunking coming from under middle of the car.  Can be felt coming from variety of locations since the problem area is located in middle of the car, around back of center console.

 

When you start accelerating, you will hear the banging increase.  You can also raise suspension on the cayenne, crawl under there, and put your hand on the cardan shaft, near the bushing.  If you can easily move the shaft around (up/down, etc), the bushing is gone and your cardan shaft is no longer stationary.  It starts wobbling creating the banging noise.

While you are under there, check the flex disk (right at front of the drive shaft), the shaft is screwed down to it with bolts.  The flex disk looks like a black thick rubber round disk.  

If you inspect, you will likely find tears or cracks in it.  This is due to shaft not being centered in line.  

 

Once you make the determination the shaft is going, I would suggest you get yourself a good person to do the replacement (cost would be about $1600 including parts & labor), or follow a DYI.  I made on on here.  Give it a read to see if you are handy enough to do yourself.  You will save at least $1000 by DIY.

I ordered mine from Colorado Drive shafts when it happened to me.  Most Cayennes did have this problem.  Its a question of when, not if.

 

DIY for cardan shaft replacement - CLICK HERE

 

Good luck.  Let us know what happened.

[AussieJet]

Could be an exhaust mount.