All of the sudden I feel the car juddering when driving over all surfaces.
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It's noticable from the driversseat but twice as bad in the passengerseat where you're physically rocked around?!
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It feels as if one tyre is completely flat or one of the wheels is buckled.
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- All 4 wheels are tightened properly
- Original Porsche 20" wheels
- wheel nuts/studs not broken
- wheels not damaged
- brakes not sticking, not hot
- all 4 tyres at the correct pressures
- not visible damage to the tyres
- no side to side play in the wheels
- no knocking and/or scraping noises
- no juddering in the brakepedal
- no errorcodes
- airsuspension works on all settings, no errorcodes
- adjusting rideheight or suspensionmode has no effect
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It seems like it's coming from the passengerside of the car and when I reverse is seems the front wheel is moving up and down??
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Any ideas what this can be?

 

Cayenne Turbo by the way!

 

Tyre out off shape?

 

Driveshaft inner joint?

Twisted (out of shape) tyre?

Would be my first guesses.

 

The tyre seems to look normal but could it still be shot?

Driveshaft would be knocking and banging around I would think, especially under power?

 

Tyre problem can be hard to see unless it does it at speed? Driveshafts don't allways make a noise either. What sort off speed is it happening?

 

It does at any and all speeds....feels like one of the wheels is squared off??

Otherwise car behaves as normal, full power, perfect braking, not a single noise but it physically bounces the passenger up and down it seems??

 

I would swap either front off side to front near side first, then if the wheels are the same size front and back try a front to back change, if the wobble moves you might find a duff tyre.

 

Switch wheels front to back and see if the sensation changes or feels like its moved to the rear. That'll give you an idea if its tyre/wheel related

Matt

 

Good advice, will give that a go tomorrow!

Never had this before...weird to feel something so 'extreme' without seeing any damage!

 

Check if tyres are directional before swapping N/S to O/S

 

maybe a tired shock absorber

 

Is so bad that if it was a shock it should have collapsed....but it's on selflevelling airsuspension wich is working fine...it's perfectly level, you can select all 4 modes without problem as well as all three dampersettings so suspension is not the culprit....

 

What about an engine mount or gearbox mount?

 

Nope, deffo a rolling issue!

 

Worth checking that some wheels are wider on the rear than the fronts...

 

If you have the optional space saver wheel use that as it's designed to fit on all corners.

 

I bought a car really cheap a few years ago with a similar problem to this the owner had spent hundreds on new hubs bearings steering rack lower arms. Basically he changed everything on the front suspension. I looked at it and found the front tyre on the nearside was egged on the inside. Changed it for the spare and the wobble was gone. Quids in lol. First thing to try if you have a spare imo.

 

I've got a set of winter wheels, those are 18" rather than 20" so I'll have to swap them all but I guess it's the sensible thing to do before visiting the stealer!

 

SORTED!!!

Swapped all four wheels for my winterset and the problem is GONE!!!

Checked the summerwheels and found one dodgy tyre: Offside rear seems to be concave over the width of the tyre, especially in one specific place...?

Never seen something like it, what can cause this?
Tyre coming apart or collapsing on the inside?

Glad it's sorted now! Cheers for thinking this one through with me!

 

pot ole that has caused the tyre casing to start to fail at a rough guess. happened to our daily on the front.