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Unread 01-18-2011, 12:48 PM   #1
ryder267
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1992 XJ Cherokee 
 
Join Date: Nov 2009
Location: California
Posts: 28
Power steering wanes at warm idle

1992 Laredo 4.0L

I start up my Jeep after sitting overnight and the power steering works fine. I can turn the wheels both directions with ease as the Jeep sits at idle.

After I start driving for a bit, and the engine gets warmed up, the power steering fails if I try to turn the wheels while stopped at idle.

If the Jeep is in motion, or if I raise the RPMs while sitting, the power steering works fine.

Hopefully, I'd like to diagnose this problem before I start throwing parts at it.

Any thoughts?

Cheers -John

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Unread 01-18-2011, 12:56 PM   #2
danw77
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1999 XJ Cherokee 
 
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have you checked to fluid level? any leaks?
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Unread 01-18-2011, 01:34 PM   #3
ryder267
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Fluid level good, no leaks.
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Unread 01-18-2011, 02:44 PM   #4
danw77
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check the belt. if it's not low on fluid, a loose or worn belt would be my next guess.
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Unread 01-18-2011, 03:26 PM   #5
ryder267
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Belt is taut and is not slipping.

I think it's the pump, but want a second opinion. Has anyone faced this, or a similar problem before?
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Unread 01-18-2011, 04:06 PM   #6
danw77
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1999 XJ Cherokee 
 
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i really don't think it's the pump. is it making any noise? is there any play in the pulley? these are typical signs that the pump is going out (also, leaks but you said there were none). i find it hard to believe that if the pump were going out would be getting symptoms you are describing. maybe someone will chime in with some additional advice, but i'm still putting my money on a loose or glazed belt. they need to be really tight in an XJ.
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