Could it old fashioned belt squeak? Go to your favorite auto parts store and buy of spray belt squeak. Maybe the belt is glazed or to hard and needs to warm and soften
If you look at you first data chart and compare the misfired cylinders to the firing order you will find your answer.
It shows every other cylinder is misfiring.
The piñon does not need to move up and down, twist is what you’re looking for. The twisting or turning like a clock, could be adding torque the shafts, then it releases and repeats. Very typical servo response..
This reminds me of a thing that happened after a million dollar steam turbine...
Bandaids or fixes. I suggest you put a dial indicator on the rack input or the closet ujoint to the rack, I think you find it is moving back and forth just a bit. That movement is torquing the shaft towards the steering wheel. The spline is trying to absorb the torque. I will leave you alone...
I rewatched all, if the lower is not moving, as it looked in the video then the question is ,what’s moving the upper shaft or better said, what’s allowing it to move? What about the bearing or bushing support at the fire wall? I think you had one showing the steering wheel moving. I believe the...
Have you changed the power steering pump? Maybe the pressure control has an issue. If you were just hitting the set point, it would pulse the pressure.
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