* Power Steering Pump: This is the most common suspect. If the pump is weakening or failing, it might have enough power to assist turning in one direction (usually the easier one, requiring less effort) but struggles in the opposite direction under higher load. Look for signs of leaks around the pump itself.
* Power Steering Pressure Switch/Sensor: This switch monitors the pressure in the system. A faulty switch could be sending incorrect signals to the power steering control module, leading to intermittent power assist in one direction. This is less likely to be direction-specific, but worth considering.
* Power Steering Rack and Pinion: While less likely to cause direction-specific problems, a worn or damaged rack and pinion can create uneven resistance depending on the direction of turning. Internal seals or components might be causing binding in one direction. Listen for unusual noises (knocking or grinding) during turning.
* Low Power Steering Fluid: Check your fluid level. Low fluid can cause the pump to struggle and lead to inconsistent assistance. Also inspect for leaks in the hoses, lines, and seals.
* Clogged or Damaged Power Steering Lines/Hoses: Restricted fluid flow from a kinked, partially clogged, or damaged hose can cause inconsistent pressure.
* Internal Valve Issues within the Power Steering Pump: The pump contains valves that control fluid flow. A problem with these valves can cause directional issues. This is a more complex internal issue that's difficult to diagnose without specialized tools.
Troubleshooting Steps:
1. Check Power Steering Fluid Level: This is the easiest and first step. Low fluid is a quick fix if that's the problem.
2. Inspect for Leaks: Carefully examine the entire power steering system for leaks, focusing on the pump, hoses, lines, and rack and pinion.
3. Listen for Noises: Turn the steering wheel slowly from lock to lock. Listen for any unusual grinding, whining, or knocking sounds.
4. Test the Steering at Different Speeds: See if the problem is more pronounced at certain speeds or when the engine is idling.
5. Professional Diagnosis: If you can't identify the issue after these steps, it's best to take your Grand Prix to a qualified mechanic. They have the tools and expertise to diagnose problems with the power steering pump, rack and pinion, and other components more accurately.
Ignoring intermittent power steering problems can lead to more significant damage and potentially dangerous driving conditions. It's best to address this promptly.
