vibrations - tranny or engine?!?

[horstle]

I have a Cayenne Turbo S MY06, the car while standing vibrates (lever in P) slightly between 2000-2300 rpm. When driving the whole car starts little shaking ( I did in 6th gear, lever to M) at around 1500rpm (not periodically) and only when accelerating all the way up top speed. At around 230 - 270 km/h the shaking is clearly notable and coming in shorter intervalls like every two seconds for two seconds. When I stop pushing the throttle the vibrations stop.

The Porsche dealer changed the coils and the tranny valve box. Before changing the car got shaken hardly because of harsh downshifts from 6 to 4 or 5 to 3. PD checked the cardan shift for optical errors, nothing visible. Porsche has no explanations except 8 of 10 Cayenne start shaking... my mileage is 92000km or around 55k miles.

I looked through the forums but could not find adequate answer for my problems. Does anyone have the same experience or can help me?!

Thanks

HO

Edited February 2, 2010 by horstle

[touareg]

I have a Cayenne Turbo S MY06, the car while standing vibrates (lever in P) slightly between 2000-2300 rpm. When driving the whole car starts little shaking ( I did in 6th gear, lever to M) at around 1500rpm (not periodically) and only when accelerating all the way up top speed. At around 230 - 270 km/h the shaking is clearly notable and coming in shorter intervalls like every two seconds for two seconds. When I stop pushing the throttle the vibrations stop.

The Porsche dealer changed the coils and the tranny valve box. Before changing the car got shaken hardly because of harsh downshifts from 6 to 4 or 5 to 3. PD checked the cardan shift for optical errors, nothing visible. Porsche has no explanations except 8 of 10 Cayenne start shaking... my mileage is 92000km or around 55k miles.

I looked through the forums but could not find adequate answer for my problems. Does anyone have the same experience or can help me?!

Thanks

HO

Did you look on the first page "

Owners Suffering from the Cayenne Vibration DEFECT"

[wvicary]

Have the engine/transmission mounts been inspected? A collapsed mount can cause excessive drive line angles or resonance through the chassis.

I've no idea how one checks the cardan shaft for optical errors... is that a fancy way of saying they looked at it but couldn't see anything wrong?? How many miles on the vehicles?

[horstle]

Have the engine/transmission mounts been inspected? A collapsed mount can cause excessive drive line angles or resonance through the chassis.

I've no idea how one checks the cardan shaft for optical errors... is that a fancy way of saying they looked at it but couldn't see anything wrong?? How many miles on the vehicles?

I was in at the PD last week, they looked with a small mirror if anything wrong with the engine mounts. I assume they looked at all other mounts which are visible - again optical check.

The car has 92000 km approx 55k miles.

In a german forum a broken torque converter (out of centre) or torque converter bridge ?! was mentioned.

Any ideas, porsche´s intelligence has NO idea.

[wvicary]

Never assume they checked all the mounts. The drive shaft can still be at fault even though the centre brng assembly hasn't failed. A seized or binding joint in the driveshaft can cause issues or impact from road debris can cause an imbalance.