I just got this as an replacement for a family members prior LS400 (92-93)
The issue is at idle there is no power steering, rev it to about 1k and poof normal operation (I've drove 92-93 for years....)
Please tell me that doesn't sound like the rack & pinion, etc. It sounds more to me like the pumps pressure isn't maintained (Also no sound on the engine as if no load due to PS btw) so pump is out of efficiency I hope. Potentially due to "screens" I read, or low fluid.
Going to check PS level out tomorrow, car is gorgeous- 160k miles. Only issue was pretty much the power steering, flawless interior. I have yet to read much about this issue, more so the leaks, etc
If you guys think it just needs new pump, awesome. I'll be doing that in a few days, going to try topping off the fluid, having it be flushed, then pump replace.