Anyone experienced and solved this problem? Appears to work at 60kph but when slowing down, steering gets very stiff. When starting from parked, works ok, but then not ok. Weird. Pump running ok. No leaks, fluid level ok.
Sounds like an issue with the dual speed solenoid. A test procedure can be found here http://www.300zx-twinturbo.com/cgi-bin/manual.cgi in the "ST" section
Bit more info, this vehicle has had very little driving, so the steering system has been idle, sometimes for months at a time. What is best bet for dodgy connector?
If dodgy speed sensor / connection, what else wouldn't work properly? The Z32 is so "interconnected" that I would expect the speed sensor to be inputs to a number of functions. However, I do have occasional electrical gremlins - for example when I use the remote central locking, the reversing light comes on and goes off once, as expected, but then comes back on and stays on????????
Have had exactly that problem myself and after trying swapping and testing everything under the sun, doing exactly what Chrispy said worked. Just disconnect and reconnect he battery after every procedure. Seemed to make something reset.
Power steering uses a belt driven pump. So if the belt fell off then NO power steering. What happens if the belt starts slipping for whatever reason, tensioner? Looseness? Slipping? Damage? Is there something there to check. I know my alternator belt is slipping because the voltmeter was showing less than normal, so I sprayed some of that TAC on the belt and now it is back to 14 volts. Might be time to adjust/replace belts or other bits around there.
