This article provide by one of my blog reader,and i rewrite it to share How to solve Prosche Cayenne accelerate slowly.Hope you can find some useful info from it .Below show the experience of Tom.
I have a 2006 Porsche Cayenne Turbo S and noticed an odd issue just recently.
Upon heavy acceleration I’ve noticed a “staggering” or “shuddering” issue with the vehicle. There is no rough idle issues or idle problems when keeping RPM’s high (even in the 4k – 6k range), but only when I “get on it” and give the car some acceleration.
It doesn’t happen in any particular gear as well – only when accelerating hard. When the misfires start occurring, the entire car (including cabin) shakes rather violently.
I also have not experienced any transmission specific issues (i.e. high rpm’s and a mis-shift or extremely hard shifts).
When I brought Porsche Piwis 2 into the dealer today, I brought one of the tech’s out to take a ride with me. I went through and immediately was able to re-create the issue. The repair man connect Porsche Piwis Tester II and my car, at the end of the ride, my check engine light finally turned on…I was pretty happy about this because the dealer was telling me that it’s hard to get Porsche to provide warranty work if there is no check engine light (is everyone else’s experience the same with dealerships)?
The codes stated that there was a cylinder 6 misfire and the tiptronic transmission flag was also presented. The standard procedure from what they told me is to replace the ignition coils (and of course it’s on the tough side to replace – engine torque mount – you name it).