2000 Chevy Lumina Hard to steer at idle

2000 CHEVROLET LUMINA
142,000 MILES • 6 CYL • FWD • AUTOMATIC
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CRW_2000
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The problem I have been having is that my wheel is extremely hard to turn when I am stopped at an idle, or moving at very slow speeds (i.e. parallel parking). It is almost as if there is no power steering at times. While driving, it steers just fine. I have also tested it when stopped, and have found that if I press on the gas just a little (up to 1500-2000rpms) the steering loosens.

It also seems to get worse as the car warms up. When I first start the car in the morning the steering (although a little difficult) is mostly normal. However, after driving a couple minutes, I notice the wheel tighten up when trying to park or maneuver at slow speeds (<5mph). I have also noticed a slight noise when turning sharp to the left at around 15-20mph (humming sound) and a persistent clicking noise coming from the front wheels that gets faster as I speed up. This may be unrelated, but I am curious about this as well.

I had a mechanic take a quick look at the steering this afternoon. From what he saw, he thinks it may be an issue with the rack and pinion steering, possibly requiring it to be replaced. I am taking it in for a full inspection later this week, as he didn't have time to look too closely. I simply would like some advice on what to expect, before I go and spend big $$ on repairs. Does this sound right, or could it be the power steering pump going bad?
Jun 29, 2009 at 11:02 PM
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A rack is possible and a rack and pump may be possible. Even a restriction in the line is possible. The pressure need to be taken at diferent points to find where the pressure is being lost.

Since it changes with the rpms, a pump is at least one expected problem. However it may have been damaged trying to overcome a restriction. Before putting the pump on the pressure should get checked to help revela if a restriction is present.
Jun 30, 2009 at 4:55 AM