Wierd Power Steering Problem

[robinlow]

I have a 1992 SC300 with a Supra 2JZ GTE swap. (With 6 Speed Getrag) (Stock no other mods)

I have just done up the exterior and engine, and I'm planning to get the car problem free before I do more work.

I have recently got hoses for the power steering in, and tried to get it to work. (Was kinda working but leaking)

All the hoses are brand new, and they are installed properly. (I think)

There is no sound or leaks from the power steering, but it does not seem to work well.

I have no power steering if my RPM is low, and when I rev the car up to 4000 rpm, I can feel the power steering.

Does anyone know if my pump is bad or the vacuum valve problem and how to diagnose it?

Thanks

[jzz30]

try check the solenoid screen. might be clogged