R34 "shaky" steering wheel when turning

[Kapr]

Hi. My car starts to vibrate the steering wheel when i turn the wheels (it happens more often when iam turning to the right)
But if i stop and try to "park" the car steering wheel shakes in both directions.
it ONLY happens when i try to steer. When iam going straight or slightly turning it is ok.

Could this be bad power steering pump or the whole rack? 
I saw some topic about "death" wobble...it does not do that. Car is not shaking when it drives straight(or slightly turning) or if it sitting idle doing nothing.

Thanks 🙂

[The Bogan]

Have you flushed and replaced the powersteering fluid?

[Murray_Calavera]

Has all the obvious stuff been done, wheel nuts are tight, you've put the car on jack stands and given the wheels a good shake and inspected all the suspension components to ensure everything is nice and tight? 

[Kapr]

@The Bogan Yes...it was done tuesday. Before it happens like one time in a month maybe and goes away in a second.
We have done the fluid service and after that it starts doing it. Maybe the new "thicker/better" fluid is too much for the "dying" pump?

@Murray_Calavera Yeah we checked that like month ago...i have new coilovers and bushings...wheels are tight and it does drive "bad" or vibrates from driving...only when i steer the steering wheels starts to shake.
Maybe bubbles in the system? Could this causing this?

And if need to replace the pump...are these pumps same on the "all" R34? Or maybe some other car has the same? (i have RB20DE NEO Manual)
I looked at the parts numbers and genuine pump is like 1050 USD O_O

Edited July 27, 2023 by Kapr

[Duncan]

Don't change the pump, unless they have been run dirty or dry (you will see visible damage/scratches inside if so), you just need to rebuild it with new bearings and seals. I've done the one on my r32 twice now, it is pretty straightforward.

The fluid should just be regular auto trans fluid. If you open the reservoir you should not see any bubbles in the fluid

[The Bogan]

1 hour ago, Kapr said:

@The Bogan Yes...it was done tuesday. Before it happens like one time in a month maybe and goes away in a second.
We have done the fluid service and after that it starts doing it. Maybe the new "thicker/better" fluid is too much for the "dying" pump?

@Murray_Calavera Yeah we checked that like month ago...i have new coilovers and bushings...wheels are tight and it does drive "bad" or vibrates from driving...only when i steer the steering wheels starts to shake.
Maybe bubbles in the system? Could this causing this?

And if need to replace the pump...are these pumps same on the "all" R34? Or maybe some other car has the same? (i have RB20DE NEO Manual)
I looked at the parts numbers and genuine pump is like 1050 USD O_O

Maybe is hasn't bleed properly 

To bleed mine (different car all together), I jack up the front so the wheels are off the ground, start the car and go full lock left to right a few times

This will force any air trapped in the system out

After flushing mine the power steering pump is all sorts of weird until I do the above bleeding 

If bleeding it doesn't work then maybe look at the pump as Duncan said 

Hopefully it is a simple fix

[Kapr]

Hi...sorry for late reply.
It looks it "repaired" itself...maybe it was need to bleed or just "get used to" the new fluid.

I have done X houndred km and problem is no more so fingers crossed 🙂
But thank you for help!

[GTSBoy]

defo needed to bleed.