* Low Power Steering Fluid: Even a new pump can whine if it's not getting enough fluid. Check the fluid level in the reservoir and top it off if necessary. Look for leaks in the hoses, lines, and the reservoir itself. A low level indicates a leak somewhere in the system.
* Damaged Power Steering Rack and Pinion: This is a common cause of noise in power steering systems. The rack and pinion converts the rotational motion of the steering wheel into linear motion of the wheels. Wear, damage, or low fluid can create a groaning or whining noise.
* Worn or Damaged Power Steering Hose(s): A cracked, kinked, or internally damaged hose can restrict fluid flow, causing the pump to work harder and generate noise. Inspect all hoses carefully for any damage.
* Clogged Power Steering Filter (if applicable): Some systems have a filter. If it's clogged, it restricts fluid flow, leading to increased pump effort and noise. This is less likely on a 1992 Grand Marquis, but worth checking if you can locate one.
* Power Steering Pressure Hose: This hose is under high pressure. A failure could cause fluid leaks and the pump to whine.
* Faulty Power Steering Pulley: A damaged or misaligned pulley can cause a variety of noises, including whining.
* Incorrect installation of the new pump: While less likely, it's possible the new pump wasn't installed correctly, leading to improper fluid flow or internal damage. Double-check the installation process. Air in the lines is also possible after a new pump. Bleed the system.
* Fluid Type: Ensure you're using the correct type of power steering fluid specified for your vehicle. Using the wrong fluid can damage seals and components.
Troubleshooting Steps:
1. Check and top off the power steering fluid: This is the easiest and first step.
2. Inspect all hoses and lines for leaks or damage: Look for cracks, kinks, bulges, or areas where fluid is leaking.
3. Listen carefully to the noise: Try to pinpoint its location. Is it coming from the pump, the rack, or somewhere else? This can help narrow down the problem.
4. Turn the steering wheel slowly from lock to lock: Listen carefully for any changes in the noise.
5. Have a mechanic inspect the system: If you can't identify the problem, a professional mechanic can diagnose the issue more accurately.
A new pump doesn't guarantee the problem is solved if other parts of the system are faulty. A thorough inspection of the entire power steering system is necessary.
