Power steering does not work at low RPM after new pump - Toyota Nation Forum : Toyota Car and Truck Forums


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1st Generation (1995.52004) 1st generation Tacoma information and discussion.

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Old 12-10-2008, 02:36 PM   #1 (permalink)
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Power steering does not work at low RPM after new pump

Hello,
My friend's power steering stopped working after a hardy romp in the field. He replaced his power steering pump and flushed the fluid and now his power steering works but only when the engine is running above 1200-1500RPMs. At idle (~700) it is extremely hard to turn, necessitating putting it in neutral to rev the engine to turn the wheel when stopped.

Any ideas what the issue could be? It is a 2000 Tacoma.

Thanks!
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Old 12-10-2008, 03:05 PM   #2 (permalink)
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When you say new pump, do you mean a new pump from Toyota or ? Either the flow control valve is stuck in the pump or the wrong flow control valve in the pump.

N.E.O.
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Old 12-10-2008, 05:26 PM   #3 (permalink)
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Belt tight?
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Old 12-10-2008, 06:09 PM   #4 (permalink)
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perhaps there are air bubbles in the system.
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Old 12-19-2008, 06:56 PM   #5 (permalink)
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Where is the flow control valve located? Is it integral in the pump or is it the high pressure fitting that has 4 holes in it that attaches the high pressure line to the pump?

I noticed that fitting has four holes, two high and two low, on opposite sides. Is there any particular orientation that that screw needs to be fitted? I don't know how you would do it, though...

Thanks again!
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Old 12-19-2008, 09:03 PM   #6 (permalink)
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Second page: http://www.*******.com/fsm/2000/Repa...0Pump/insp.pdf

The flow control valve should be behind that fitting that you are talking about, here is an exploded view: http://www.*******.com/fsm/2000/Repa...0Pump/comp.pdf.

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Old 12-19-2008, 10:13 PM   #7 (permalink)
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NEO, thank you very much. This gives me some new ammo to take a look. Will I be able to tell w/ a visual inspection of the flow control valve as to whether or not it is functioning?

Thanks again
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Old 12-19-2008, 10:20 PM   #8 (permalink)
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Well, the answer is both yes and no. About the only thing you can do is make sure that it is not sticking inside the bore of the pump housing. And check for debris on the screen of the valve. If it is the wrong valve, it will probably check good but doesn't provide the needed assist until the pressure increases with rpm.

Do you still have the old pump?

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Old 12-20-2008, 10:33 AM   #9 (permalink)
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Thanks again for the response. I do still have the old pump. I suppose I could swap out that flow control valve but could it be damaged due to debris from the failure of the old pump? Or, is it something I could just wash with p.s. fluid and reuse?

Indeed, debris is something I am concerned about with the new pump. I did flush the system once the new pump was installed but I know from doing AC work that sometimes a flush isn't enough...

Thanks again!
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Old 12-20-2008, 10:55 AM   #10 (permalink)
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Should have sent you the complete link to the site: http://www.*******.com/fsm/2000/index.html.

Here is the section for checking the pump and the valve: http://www.*******.com/fsm/2000/Repa...0Pump/insp.pdf. Page 2 has the instruction for checking the valve and the ID code.

Was it factory pump that you are installing? What was the old pump doing?

N.E.O.
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Old 12-20-2008, 11:12 AM   #11 (permalink)
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NEO, thanks again!

The old pump completely stopped working, no power assist at all, at any RPM. But oddly it was not making any noises and the bearing seemed OK when the pulley was on. However, when we removed the pump it was clear the bearing was not spinning freely when compared to the new pump. The pump stopped working after a serious romp in the field, but that may have just been conincidence.

The new pump is a rebuilt pump we bought at Autozone, perhaps not the best replacement but cost was a major concern.

Interestingly, the pump seemed to work OK initially but it may have only been because the RPMs were higher during a cold start. I'm not sure because my friend did the initial test.
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Old 12-20-2008, 11:16 AM   #12 (permalink)
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One thing you may consider is an inline power steering fluid filter on the return line to the pump. Have seen problem from debris floating around in the system causing the flow control valve to stick. Napa stores usually stocks the filter, might check Auto Zone too.

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Old 12-20-2008, 11:24 AM   #13 (permalink)
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What happens when you have the vacuum hoses swapped on the control valve? It's supposed to bypass the pump at high speeds, but if the hose were swapped, would it bypass at all speeds?
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Old 12-20-2008, 11:31 AM   #14 (permalink)
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The valve with the vacuum hoses attached to it is the idle up valve. At low speed, when the power steering is being used, it will increase the idle speed slightly to compensate for the load. It doesn't matter how the hoses are connected, and it doesn't have anything to do with how the power steering operate. The flow control valve is what controls the pump output pressure.

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Old 12-29-2008, 01:54 PM   #15 (permalink)
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I have a 97 tacoma and had similar problems. Put 3 rebuilt pumps on and they didn't seem to work especially in cold weather. Flushed out system and everything. Finally figured out the problem. The rebuilt pumps did not come with a new reservoir. The problem was my old reservoir had a screen in the bottom that was almost completely stopped up with sluge. After removing and washing with gas the pump that was whinning and not working was completely fine. Hope this helps.
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