Power Steering Pump... please help

garrettsouth · #1 (**permalink**) 15-01-2010, 03:42 AM

I have a 91 300zx NA 2+2. It has a new high pressure hose, new rack and pinion, and 3 new power steering pumps... and my power steering still only works intermittenly. I only use dexron like the book says. The power steering will work great the first few days after I have installed a new pump, but go bad again everytime. Can anyone offer any help?

Nigel Brook · #2 (**permalink**) 15-01-2010, 08:53 AM

Have you bled the air out of it?

**Mr.F** · #3 (**permalink**) 15-01-2010, 12:33 PM

There is a fault elsewhere - possibly pressure switch on the lines or the solenoid unit on the rack pinion.
When a fault is detected the system defaults to no power assistance (fail safe mode) and the steering goes "heavy" - commonly happens intermittently giving an "on-off" feel while cornering.
The steering control unit looks for input from speed sensor (via the speedo), operation of stop lamp switch, clutch switch, parking brake switch, neutral switch - loss of any signal for a significant period leads to default.

Bleeding should be done with engine running and front wheels off the ground - turn from lock to lock adding fluid until no further decrease in level and no bubbling evident. Pump may click or buzz if air bleeding not complete. Don't overfill!

garrettsouth · #4 (**permalink**) 16-01-2010, 02:37 AM

We did bleed it. "possibly pressure switch on the lines or the solenoid unit on the rack pinion" which makes sense, but I don't know how to test it. Is there some way to test what issue it could be?

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