Stagea 100Kph Pulsing/ Shaking

[Mashlee08]

My 96 rs4 stag has had a problem since I have brought it , driving specifically between 85-115kph, I would estimate, I have a shuddering or 'pulsing' sensation coming from what I believe to be the rear axle of the car. Like additional torque is being applied to the rear driveshafts momentarily in an on/off fashion. I would say that it is not a reducing speed sensation, as in abs acting on the rear wheels for some even more bizarre reason, especially as it only happens at a light load throttle position and the sensation is destinctly coming from the rear end. Also it only seems to only happen when it's been running for a while or fully warmed up. Anybody got any suggestions or ideas as to what could be causing this to happen?

[KiwiRS4T]

Is it an awd car? Are all your tyres the same size and type? Tried turning left and right and listening for wheel bearings? Jack the car up and have a look? Wheels binding (foot or handbrake)?

[Mashlee08]

Is it an awd car? Are all your tyres the same size and type? Tried turning left and right and listening for wheel bearings? Jack the car up and have a look? Wheels binding (foot or handbrake)?

Yeah it's awd and yeah all same tyres and same size. I can't hear anything while I'm driving. And it doesn't feel like anything binding up. Like I say it only really starts happening after driving for 20 mins or so and can only notice it at higher speeds

But thanks for your suggestions

[pipster11]

Will be rest tyres are worn slightly more than the fronts

Mine is doing it ATM so I have had to make it rwd till I sort out new tires

Funny thing is that they aren't even that worn but the fronts are brand new

[SABBAi]

First up, I'd get the wheels balanced. This will shop up 90% of your problems. If the tyres are unevenly worn, the tyre shop will tell you (they like to make money). Uneven tyre wear can cause the AWD system to start sending torque to the front when it's not needed. If the rims are buckled or out of round, they'll tell you. The other thing it'll fix is unbalanced wheels.

I've had a vibration caused by all of the above.

[DVS JEZ]

Try putting the car into RWD and testing. This should eliminate the attessa system

[PTR_RS4]

Could it not be missfiring vibrations? Like afm, plugs or coils? Like the surging feeling I used to get especially after the car is warmed up

[loymclure]

hhhhrrrmm sounds like my issue around 100 KM/S + -,the car shudders like it doesnt know what gear to select.

im about to have a shift kit fitted and oil changed ill let you know if this fixes the issue i think it is, which is oil thats lost its viscosity and causing the auto to do silly things. if it does fix this issue try sending a message to Jetwreck, he is doing all of my work as i cant be fkt, coz im lazy................... Actually I just read your sig and it says ur in Auckland and im pretty sure he wont go there unless you pay for it. but it might be worth asking him for a decent oil for your auto unless you know of one your self?

Edited April 24, 2013 by loymclure

[wolverine]

Ummmm random thread bump back to early Nov 2012

[Zedhead70]

I had this problem too, in my 2000 S2, really annoying and sometimes felt like the car was jerking back and forth at 80 - 100 km/h, turned out to be a really simple fix, check the attessa fluid level in the reservoir located in the back behind the inspection cover on the right hand side, make sure the engine is running as it will appear full if the engine is off, topped it up to the correct level with ATF/ power steering fluid, problem solved. Regards Craig

[SABBAi]

Good tip Craig.