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No power steering unless rev engine

 
Old 03-10-2019, 10:31 AM
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Default No power steering unless rev engine

Stock LS1 power steering pump with aftermarket Al reservoir. . New/reman gen 3 power steering box 2.5 turn.

When the car is idling, I have no power assist. If I rev the engine to ~2000 RPM, I have assist.

Any thought where to start?
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Old 03-10-2019, 08:17 PM
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Is the belt tight? Hose kinked? Filled with fluid to the fill line on the dipstick tube? It absolutely would not be the first time a remanufactured power steering pump was bad fresh out of the box.

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Old 03-10-2019, 08:24 PM
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When u rev it does it feel like it should feel, or does it simply feel better...
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Old 03-10-2019, 09:22 PM
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Belts are tight, do not see any kinks, it’s full to the top.

It it feels like there is no assist until I rev the motor.
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Old 03-10-2019, 09:34 PM
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Willing to bet the housing is worn of your nice new reman pump. I would recommend buying a brand new pump, no reman
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Old 03-11-2019, 07:46 AM
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The steering gear or Pump?

the steering gear was reman, the pump is the stock LS1 with ~70k on it
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Old 03-11-2019, 08:45 AM
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did you bleed the air out?> jack it up (wheels need to be off the ground) and slowy turn it lock to lock several times, check fluid levels while doing this.
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Old 03-11-2019, 07:09 PM
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I’ll give that a try. Thanks.
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Old 03-11-2019, 09:20 PM
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The pump, I recently learned the bore inside our pumps wears and will begin to lose pressure. If the pumps aren't tested after they rebuild them, they will be sellling you a bad pump again
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Old 03-12-2019, 02:03 AM
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Originally Posted by Floorman279 View Post
The pump, I recently learned the bore inside our pumps wears and will begin to lose pressure. If the pumps aren't tested after they rebuild them, they will be sellling you a bad pump again
the wear items in the pump are....shaft bushing.....shaft....inner housing....pump vanes

you can see pics of all in the PS rebuild sticky on top
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Old 03-12-2019, 07:12 AM
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With pressure only at high RPM, I like Jwooky's suggestion to check the belts first. If they are good and have tension, then my next guess would be a stuck-open pressure relief valve. (in the pump) This could be allowing pressure to bleed off continually.

The solution is the same as a worn pump - time for a rebuild.
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Old 03-12-2019, 01:30 PM
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The pump was not rebuilt, it is the stock pump with 70k on it. They are not known to fail that low miles are they?
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Old 03-12-2019, 02:08 PM
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Originally Posted by Jwooky View Post
The pump was not rebuilt, it is the stock pump with 70k on it. They are not known to fail that low miles are they?
My pump had 106,000 on it. Had no issues, just had the motor out of the car so figured why not send it to turn one for a performance rebuild. They rebuilt it, tested it after rebuild, and told me I had pressure loss due to a worn out bore. I didn't even notice any issues, but the stock pump operates at a pretty high pressure so could take a decent amount of pressure loss until you felt something.
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Old 03-13-2019, 09:45 AM
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Originally Posted by Jwooky View Post
They are not known to fail that low miles are they?
The pump is not known to fail this quickly, but the fluid is... If that stuff gums up and the pressure relief valve doesn't shut all the way, you will see pressure bleed off at the low RPMs - particularly where you need all the pressure you can get.

Your pump may be perfectly fine, but if that relief valve (located in the pump body) is open, you might as well be driving a car with manual steering.

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Old 03-13-2019, 02:57 PM
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Originally Posted by wssix99 View Post
The pump is not known to fail this quickly, but the fluid is... If that stuff gums up and the pressure relief valve doesn't shut all the way, you will see pressure bleed off at the low RPMs - particularly where you need all the pressure you can get.

Your pump may be perfectly fine, but if that relief valve (located in the pump body) is open, you might as well be driving a car with manual steering.
any way to check/test it?
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Old 03-14-2019, 02:07 AM
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only thing I can think of is to remove it and clean it....easy to do
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Old 03-14-2019, 06:46 AM
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Originally Posted by sjsingle1 View Post
only thing I can think of is to remove it and clean it....easy to do
+1. You could take the pump off, drain the fluid, inspect the valve, possibly replace it, replace the pump, replace the fluid, bleed the system, etc. but then you'd be left with a lot of effort, a big mess, and a pump with 1/2-3/4 of it's life gone.

For all that effort, I'd just remove the pump, send it off to Turn One, and have a quality rebuild back in-hand the following week to give you a good bit of certainty for the next 100K miles. (You can also do the pulley upgrade while you are at it.)
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Old 03-14-2019, 05:26 PM
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Originally Posted by wssix99 View Post
+1. You could take the pump off, drain the fluid, inspect the valve, possibly replace it, replace the pump, replace the fluid, bleed the system, etc. but then you'd be left with a lot of effort, a big mess, and a pump with 1/2-3/4 of it's life gone.

For all that effort, I'd just remove the pump, send it off to Turn One, and have a quality rebuild back in-hand the following week to give you a good bit of certainty for the next 100K miles. (You can also do the pulley upgrade while you are at it.)
my opinion don't waste the effort. Your bore still has 70,000 miles of wear. Buy a new pump with a new bore
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Old 03-15-2019, 02:57 AM
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floorman.....which bore ??
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Old 03-15-2019, 06:36 AM
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The main bore, like since it's a pump inside there is a rotating gear like thing. Power steering fluid doesn't lubricate as well as engine oil so u still have 70,000 miles of not the greatest lubrication of a metal on metal contact. It's not bad lubrication just not as good as engine oil. A new high performance pump from turn one is 350 without pulley or reservoir. It's a little steep in my opinion but I still did it in hopes of freeing up 2 or 3 horsepower (I liked the idea behind the increased stiffness and pressure changes so I justify it by saying I'm spending 150 more than I think I should for 3 to, so 50 bucks per hp, not a terrible cost). But summit sells a new pump by tuff stuff, Its under 150. I would try that if u wanted to keep a stockish pump
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