STIFF, THEN SMOOTH POWER STEERING
1991 Lexus LS 400 • V8 2WD Automatic • 189,000 miles
My power steering is stiff while turning, then in the same motion it is not stiff, then stiff again
April 20, 2011.
April 20, 2011.
Be sure the power steering fluid is full too.
I replaced this pump last week, it was working fine before i changed it, but somewhere on the pump it was leaking, now i have no leak,just this stiff steering. and it is too dangerous to drive until i can correctly diagnose. i am afraid to drive it because if i try to turn, or go to another lane it may oversteer. could there possibly be something else. i also replaced the rack and pinion
Now that I know the history and details, it is possible there is air in the system that hasn't fully bled out yet. Why did you replace the rack and pinion assembly? Was that because of the hard steering or did the hard steering start after the rack replacement?
I replaced the rack in january, this hard steering started last week after i replaced power steering
It's not unheard of for a rebuilt rack to have problems, that's why they have a warranty, but it sure sounds like there is air in the system. Be sure the serpentine belt is tight too. Watch the power steering pump pulley to see if it slows down while a helper turns the steering wheel.
I am inclined to agree about the air, my last question is how to bleed the air out, and thank for all your help
Look for signs of foaming in the reservoir too. Red power steering fluid will look pink. Clear fluid will look white or cloudy. If the fluid is foamy, the tiny air bubbles are circulating WITH the fluid rather than floating out. Even though those bubbles are small, there's a lot of them and they compress just like a big air pocket. The only cure for that is time. Each time you stop the engine, some of those bubbles will float up in the reservoir and out, but the ones in the rack and hoses will have to circulate their way up to the reservoir the next time the engine is stopped.
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