Shifting Clunks - experts help!

[jrolstin]

Hi guys,

I have a 2004 Cayenne S and have had shifting problems since I bought used a few months ago.

My symptoms are: when cold, 1-2 up shift is a huge jerk / lunge (no clunk though).

Downshifting from 3-2 awful clunking. It's as if revs are not matching properly? Even when I shift in manual mode (downshifting, driving sporty) it seems engine doesn't blip, it just slides into gear and works the torque converter.

So far I have done a fluid and filter change and valve body change. Then I reset tip adaptation and the cold 1-2 problem went away for a while.

After I did the valve body it seemed to shift better but the problem still exists. It is a valve body from revmax torque converters.

My question is now, what is next? I've read about TCU and DME, but would love someone more experienced to chime in and help get me turned in the right direction.

Finally, I have durametric, but it doesn't seem to be able to communicate with DME or Tiptronic trans. I thought I was able to at one point and it seems flakey every time I use it - any thoughts on that?

Regards,

[gbratk]

I had the same problem. After changing Valve body, I also changed TCM, and all shifting problems are gone.

Look this:

http://www.renntech.org/forums/files/getdownload/698-cayenne-hard-shifting-in-range-first-to-second-spdf/

[jrolstin]

Thanks for the quick reply. My next problem is I can't access my units electronically to determine what I need... Nothing seems to communicate when using durametric. Is there a particular version which works better?

Also, did you replace the TCU yourself? Did you have to reprogram anything or just plug and play?

I have a 2004 cayenne s if that helps.

Thanks

[mudman2]

Its not plug and play and has to be programmed onto the system. The valve body first if I were you

[jrolstin]

Its not plug and play and has to be programmed onto the system. The valve body first if I were you

Hi mudman2. I have already installed a new valve body. The details of what I have done so far are in my original post.Thanks Edited March 17, 2013 by jrolstin

[gbratk]

With ross tech VCDS cable, you can code TCM without any problems.

But you need to know which DME sw. you have, and if it's to old, DME needs to be updated to, and this can only be done with PIWIS by dealer.