Hi all

My 2004 CTT with 113k miles has suddenly started to vibrate intermittently under mid to hard acceleration from around 30 mph to 50 mph. It feels as if i have flat tyres (i don't) and i can accelerate through it from around 60 mpg or so it isn't as evident.

The strange thing is it doesn't seem to happen all of the time. Its very evident some times and i would go as far as to say on the trip home last night it didn't do it at all? It seems worse after its been stood over night?

I realise there are threads about similar topics but i wanted to post because of the speed it happens and the fact that its not all of the time?

I was about to sell it so would be grateful if someone can diagnose this issue and give me an indication of the cost / fix needed please?

Thanks

Car

 

check out the following
cardan shaft
Tire balance
if wheels are bend

good luck

 

Wouldn't the cardan shaft be more constant?

Tyres are pretty poor on the rear and will need changing in a few thousand miles anyway, but it just sort of happened. It wasnt an issue over the weekend then it was on Monday morning?

 

+1 for cardan shaft. When the bearing starts going bad it will vibrate under partial load. Mine would vibrate between the speeds you mentioned when on an incline, but be fine under WOT or when I was on a flat surface. Also, it was not all the time, more so when the vehicle was hot. They sell a bearing fix kit for less then $500 which is cheaper then replacing the entire shaft. Regardless of what my internet based diagnostic is, have it checked Links to the kit if you need it: http://www.vertexauto.com/ShowItem/2...t%20Mount.aspx

 

Thanks for the suggestion, local indy confirmed that the bearing is split. He also went on to say that he would prefer to fit a new bearing than the clamp, would you agree?

I found this on fleebay, is it the right item if i did go that route?

http://www.ebay.co.uk/itm/2711001717...84.m1423.l2649

Thanks

Carl

 

Also, in regard to the clamp kit, what is the black item with the holes in?

Excuse my ignorance but i notice these can also be purchased on fleebay.

http://www.ebay.co.uk/itm/Universal-...item5d41cd9d01

More expensive than the other item, and I am confused as to what is needed?

 

I have yet to hear of the actually bearing itself being the problem. However, it is common (almost expected at this point), for the bearing support bushing to wear out. Keep in mind that over a 100K miles? is a lot, so you may want to replace the bearing for peace of mind.


That looks like it will work. However, be warned that I do not think it is OEM since Porsche does not have a separate part number for that part. You can:

(1) buy a completely new driveshaft pre-assembled from Porsche
(2) get a driveshaft shop to rebuild your driveshaft
(3) use an aftermaket replacement that you can DIY yourself that is marketed to be a permanent fix.

I choose option 3 in another thread.

That is a flex disk. You will need to replace this, in addition to, the center driveshaft support bushing at the minimum.

 

Me Too option 3 and for me works fine!!

 

So i need the clamp and the flex disc? The link to the vertex site shows the clamp and disc all in one, so that would be all i need? I ask because the video on the vertex link doesn't have any reference to the disc, only installing the clamp?

 

You should install both the new DS center bearing support (clamp) and the flex disk. Due to the center bearing support going out, it places more stress on the flex disk- to the extent that it could be damaged as a direct result.

It used to be optional (but strongly recommended) hence why is it not mentioned in the video. Since it has been released, they started to package the two items together. Once again, install them both,

 

Thank you for the help. I have no idea when it comes to fixing these things

I was hoping to try and get it under my warranty but don't hold much hope

 

No worries. If you can't get it done under warranty, then look for a good independent shop if you are not comfortable with the repair. Let us know how it goes. G/L

 

Hi all, decided to sell the Cayenne for a Bentley GT rather than paying to have several issues fixed.

Since the prop problem appeared its got a little worse this past few days and the vibration is now quite bad, will the prop totally fail or just cause the vibration until fixed?

I ask because its a 1.5 hour drive to the dealer where I buying the GT from, will it be ok to drive it there? Its not as bad under very light acceleration but Im still worried. The dealer knows of the problem so its just a case of knowing if it will get me there?

Thanks

Carl

 

I just had it done in Vancouver for about $1000. Better than aftermarket junk. You will be fine driving it to the dealer if you keep the speed steady. No fast acceleration to cause the vibration.