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Can depends if pulley pump was installed incorrectly or you have a bad rack. The best way to check if your pump is actually pumping is by crimping the return line with pliers careful not to cut it and listen for whine if no whine is heard pump is defective if whine is heard your rack and pinion is bad
You haven't described the noise or whether the noise increases when the pump is under load, or perhaps that is the only time it makes a noise?
As you undoubtedly know some noise is natural when a fluid is being forced through hoses and orifices under great pressure and some systems are noisier than others, especially when the steering is on full lock and all the surplus pressure is diverted through the relief valve.
Perhaps there is an inherent fault that is causing the fluid to become aerated or perhaps it is something more basic and the drive pulley alignment is off.
Perhaps it is a matter of poor routing of hoses and pipes transmitting normal noise into the body and amplifying it.
I believe there are additives available that can help lessen some of the noises of complaining oil.
if the power steering fluid is leaking out of the pump itself then replace the pump add fluid and bleed all the air out of the system.the whining noise was the pump being low on fluid causing air to get into the system.if the leak is not the pump itself then you will have to find out if or which line power steering line is leaking,and replace the hose.the frothy mettalic look is the result of air in the power steering system.you may have to have it towed to a shop to have it repaired.if you changed just one plug why not all the plugs,this could be why it is running rough again,maybe even ignition wires especially if they are the original wires(10 years is good)
power steering pumps can be noisey for years without actually failing but in saying that, the longer you let the pump whine the more metal will be going into your rack causeing premature rack replacing. if the level is ok and it whines then the pumps on its way out