How to replace power steering pump - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 11-15-2010, 07:18 PM
Rossum Possum Rossum Possum is offline
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How to replace power steering pump

Who on here has done this? Mine really only wants to work when I first start up, and it's at high idle, and when I'm accelerating a little, so I'm assuming the pump is no good. Anyone have any ideas? Thanks!
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  #2  
Old 11-16-2010, 01:49 PM
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the roadie the roadie is offline
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What's confusing about it? Couple hoses and three bolts. Oh, moving the pulley can be a bear to pull or smack off the shaft.

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Old 11-16-2010, 02:34 PM
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Are you sure that it's yhe pump and not the steering rack itself? Does it make noises when you are turning the wheel while sitting? Have you checked the fluid level and quality?
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Old 11-16-2010, 06:37 PM
Rossum Possum Rossum Possum is offline
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Originally Posted by DZP View Post
Are you sure that it's yhe pump and not the steering rack itself? Does it make noises when you are turning the wheel while sitting? Have you checked the fluid level and quality?
It makes no noise, maybe a little bit when at speed but never any other time. Fluid looks full and I don't think it was burnt. Just pisses me off. Making a trip to TN next week and don't want to risk being stranded. Also have what looks like fluid on the back of my right rear dust shield for my brakes. Brake fluid level is fine though.
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Old 11-17-2010, 12:32 PM
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With there being no noise and the fluid good I would look down line of the system. I would look a little more closely at the steering gear and the steering rack. You may want to put it up on stands and see if there is still performance issues. If so you should be able to more closely isolate the problem by getting to where the components are at. Keep us updated!
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Old 11-17-2010, 01:39 PM
eyring2210 eyring2210 is offline
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if it is not making any noise the shaft may be broke in the pump. Take the belt off the pulley and pull towards the radiator. If the shaft is broke the pulley will detach with a bit of the shaft.
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Old 11-18-2010, 02:11 PM
Rossum Possum Rossum Possum is offline
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Originally Posted by DZP View Post
With there being no noise and the fluid good I would look down line of the system. I would look a little more closely at the steering gear and the steering rack. You may want to put it up on stands and see if there is still performance issues. If so you should be able to more closely isolate the problem by getting to where the components are at. Keep us updated!
Ok this problem is completely RPM dependent. Pump sounds fine. Air in the system maybe? What's your opinion?
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Old 11-18-2010, 02:24 PM
Doc Brown Doc Brown is offline
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Could be air. Could be a clogged valve in the rack. Are you getting any pulling to the left or right (pulling that cannot be attributed to front end or tire issues), or more difficulty turning in one direction or the other? If so, that's indicative of poor fluid flow in the rack.

Fortunately bleeding it is really easy. Jack the front end up so that both front tires are off the ground. For safety, use a set of jack stands. Take the PSP cap off. Put a pan underneath where the PSP is. Turn the key on, but do not start it. Slowly turn it all the way to the right, then to the left. Do this 20 times. If fluid comes out, especially a lot of it, then you likely had air. Put the cap back on and start the engine, then repeat the process with it running. Now, lower it and test drive it to see if its better. If its better, you may find its still not quite right, then you'll have to repeat the process.
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Old 11-18-2010, 04:45 PM
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That is a good start to see if that is the problem lies. If the case then the next question being how the air got into the system. Being that it is a low pressure hydraulicly sealed system then there would have to be a leak somewhere to allow air in. A pin hole could allow air in but not allow a thick fluid to leak out. The system at that time will need to be pressurized to find the leak. These are all possible scenarios. First is going to be getting under there and looking around for the obvious.
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Old 11-18-2010, 10:17 PM
Rossum Possum Rossum Possum is offline
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Quote:
Originally Posted by DZP View Post

That is a good start to see if that is the problem lies. If the case then the next question being how the air got into the system. Being that it is a low pressure hydraulicly sealed system then there would have to be a leak somewhere to allow air in. A pin hole could allow air in but not allow a thick fluid to leak out. The system at that time will need to be pressurized to find the leak. These are all possible scenarios. First is going to be getting under there and looking around for the obvious.
I tried the above to see if that made it better. No dice. I'm going to need a pump, and a mechanic looked at the fluid, and it was burnt, so yeah I'm going to need a pump. I wonder if anyone is parting out a TB and maybe I could get my hands on a cheap one lol
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