wierd
I would check the suspension bushings, if one of them is worn it would cause a knocking noise.
Power Steering?
I have mercury mountaineer 4x4 03 had grinding noise easy fix remove the shaft which connects the transmission to the rear end
I experienced a knocking noise in my 03 Xterra and found out is was a bad wheel bearing seal and had to have the Nissan dealership replace it for about $400 (includes labor and parts).
The knocking noise could be one of several things. The wheel bearing, a worn steering or suspension part, or road debris could be causing the noise.
i have the same problem what this could be
I had a noise in the front end of my 2004 Mountaineer similar to what you described and it was front wheel bearings on the passenger side. $291.
needs new wheel bearings
u joint
A knocking noise in the front wheels can be a very serious problem. The knocking noise could be caused by bad ball joints. Bad ball joints can slip off the tie rods and cause the wheel assembly to collapse. This problem should be looked at as soon as possible.
many many things, Loose lug nuts which lets wheel make knocking noise. Engine will make a knocking noise if it is really low on oil. Some timing belts make a knocking, slapping noise just before they break.These are just a few examples . Have someone ride in car with you as you duplcate the noise and see if they can determine which part of the vehicle it is coming from.
if it sounds like growling it is a wheel bearing.