A stuck or inoperative flow control valve

Replace or clean the valve.

The pressure plate is not flat against the cam ring.

Replace the pressure plate.

Extreme wear of the cam ring

1. Replace the cam ring.
2. Flush the system.

A scored pressure plate, thrust plate, or rotor

1. Replace any scored parts.

If the rotor is scored, replace the rotor with a rotating group.

2. Flush the system.

The vanes are sticking in the rotor slots.

Free the vanes by removing any burrs, varnish or dirt.

Improper installation of the vanes

Properly install the vanes. Ensure that the radius edge is installed to the outside.

Air in the fluid

1. Locate the leak.
2. Repair the leak.
3. Bleed the system. Refer to Power Steering System Bleeding .

Low power steering fluid

Add the necessary amount of power steering fluid.

The pump belt is slipping.

Refer to Engine Mechanical.

Damaged hoses or steering gear

Replace any damaged components.