Hi all, I searched thru the posting but didnt find much. I have a 2000 CTD, see signature. I have what sounds like a power steering noise / vibe at low RPM's when driving. I can really feel it in the steering wheel more than I can hear it (you all know the diesels are kinda loud ). Nothing much at idle or high RPM's just when I am driving along at a good speed and let off a little. I read some forums about the Royal Purple Fluid helping. Should I try this or is my pump going out, or something else?

 

I too have the exact same problems, the dealership replaced the power steering pump with no change. My friend has a 2000 and his does the same as well. Dont know if synthetic will help but I may find out soon. I dont think it is anything to worry about but it is annoying. Mine has been doing it for 50000K with no ill effects and it isnt getting any worse.

 

If you're talking about a hiss/buzz sound (like its low on PS fluid), that can be caused by a restriction (kink) or even sharp turns in the return line. You should open your reservior to see if the fluid has a layer of bubbles on the top. That's a sign that the fluid is foaming. It can also be caused by air getting in the pump inlet (which usually doesn't happen unless the fluid level is low).