LLY: Power steering problem

[zstirling22]

Hi I have a 2004 duramax 2500 with the lly and having a power steering problem. Needed new pitman arms and tie rods so when I went to do those I saw there was a small leak in the power steering box so I figured while it was apart I should just change it. So I got a new one and installed it and blead it but now I'm not getting any power steering unless I give the truck some throttle. As soon as I let off of the throttle though it locks up. Wondering if anyone else has ever ran into this before? Maybe the pump or hydroboost?



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[TheBac]

Moved to Chassis/Suspension.

 

[WVRigrat05]

Still has air in it or pump is weak. Did you recheck fluid after priming?

 

[zstirling22]

Ya I checked the level and kept adding fluid as I primed it and it doesn't seem to be taking anymore so I'm guessing it's fully primed


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[WVRigrat05]

Ya I checked the level and kept adding fluid as I primed it and it doesn't seem to be taking anymore so I'm guessing it's fully primed


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I had my stock pump do that at 26k miles after adding a cooler, I flushed it, workrdit and drove it for a week and never got better. Had to change pump out.

 

[Balindir]

I had my stock pump do that at 26k miles after adding a cooler, I flushed it, workrdit and drove it for a week and never got better. Had to change pump out.

Seems odd that the pump would be weak at the same time he changed out the steering box... not saying your experience is wrong. Just wondering if there isn't another issue at hand?

 

[zstirling22]

Ya not sure why the pump would go as soon at I changed the box. Is there any way I could test the pump before I go changing it to find that it's what's bad?


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[Balindir]

Ya not sure why the pump would go as soon at I changed the box. Is there any way I could test the pump before I go changing it to find that it's what's bad?


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Just an idea, and i know it would be a pain in the butt... but you could try putting the old box back on and see if anything changes?

 

[zstirling22]

lol that's with first thing I tried then I thought napa sold me a bad one so I exchanged it for another new one tried that one last night and still can't turn the wheel with the truck on the ground after bleeding


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[Balindir]

10-4, Well if you tried 2 different boxes then I guess the proof is in the pudding. Guess you'll be putting a new pump on?

 

[zstirling22]

Ya ill have to try that. Hydro boost going bad wouldn't cause that same symptom would it?


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[Balindir]

Somebody else would be able to answer that question better that i would. Good luck with that project.

 

[DuramxMan]

Did you jack front end up and turn stop to stop and let it set for 2 or more hours and then top off?

 

[zstirling22]

No haven't tried letting it sit I'll have to try that today and see if the level drops at all


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[citadel]

Did you jack front end up and turn stop to stop and let it set for 2 or more hours and then top off?

Is this a method for purging all the air in the system?

 

[DuramxMan]

That is how Redhead gearboxes says to do it and even recommend if you can leave it jacked up overnight is better!

 

[WVRigrat05]

No haven't tried letting it sit I'll have to try that today and see if the level drops at all


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Bad hydroboost will overheat the system and give the same symptoms, it's always a crap shoot when working on the steering system unless you rig up hoses with gauges and get pressures. Not sure of anyone that's ever done that though.


I just know I've put 4 pumps on this truck in 100k from heat and 5 on the LLY.

 

[zstirling22]

Okay thanks good to know. I'll try a new pump and see what happens


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[WVRigrat05]

Okay thanks good to know. I'll try a new pump and see what happens


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Fwiw, I put a PSC pump on and a large cooler and mine steers better than stock.

I've bought used LMM pumps when I needed a spare, remans are hit and miss. But you can return the reman if yours is good, just tell them the pump was junk and your going GM replacement.