Changing pulley size is not the answer. Power steering pumps do not have to move a very large volume of fluid, and they have plenty of reserve capacity. Higher pumping speeds, and volume, won't get you more pressure because there is a pressure relief valve already doing its thing.
When you have weak power steering assist that comes back by raising engine speed, that is due to a worn pump. This is a common problem on any cars that use the "ZF"-style pump. That's a real small unit with a kind of square body, and it usually has a remotely-mounted reservoir. Those have fiber vanes that wear out and allow leakage past them.
Be aware we called Tempos and Escorts "killer cars" because of their extremely high tie rod end failure rates leading to loss of control and crashes. Those steering systems should be inspected at least once a year at a tire and alignment shop, and anytime there is a new noise of symptom.
Wednesday, February 24th, 2016 AT 10:03 AM