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It can be many different parts that could cause the noise. Low on power steering fluid, worn or loose belt, defective constant velocity joint, defective wheel bearing, defective rack and pinion steering, worn steering parts (tie rod ends, ball joints, idler arm, etc.)
iF YOUR PONTIAC HAS ELECTRIC OR ELECTRIC ASSIST STEERING, THEN IT SOUNDS LIKE YOU HAVE MISSING TEETH/DAMAGED GEAR INSIDE THE ELECTRICAL STEERING ASSEMBLY. THIS WOULD CAUSE THE NOISE AND THE OFF CENTER STEERING CONCERN.
You might want to check the power steering fluid. The resevoir is on the passenger side toward the passenger seat it is kind of hard to find. But i have a '97 Grand Prix and i noticed that whenever i would turn sharp while going pretty fast it would make a grinding noise and i could feel my steering wheel pulling me. But the thing is the power steering never whinned or anything. So i checked it and there was absolutely none in there. So check the fluids first.
hallo if power steering fluid is bubbly, means that its sucking air somewhere before(sucking side) (or on) power steering pump. that would explain the noise. Check (when cold) fluid level. if level is low, top up before starting the car. had a lot of cars that high preasure hose was leacking fluid on restricting valve. if so, fluid comes out on the end of protecting cover of the hose. (driver side on spark plugs and down the engine). replace hose with original. do not try to make it your self, becouse steering wheel will shake, sinse restracting valve is missing. But if you press brake pedal, that has nothing to do with it. Marko
it may be your steering lock try and move the steering left and right whilst turning the ignition or an old car thief trick is just keep pull down to one side on the wheel until the steering lock snaps or shears and it should be free to turn after that good luck