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Discussion Starter · #1 ·
Hi folks,

Two weeks ago, I replaced my PS Pump and hoses. Job went smooth, and the PS was nice and quiet. Tonight, after leaving the car for a week at Seatac airport, it was as loud as ever. It sounded like a Ford Escort or a Ranger... do you know the sound I mean? What did I miss? the pump is a remanufactured unit from NAPA.... the hoses are new....... I put the old sensor on the hose near where the box is (I assume this is for the variable rate PS)..... any ideas? What's making the noise? Is this my cue to put a quick ratio steering box in? (only if that's the source of the noise!)...... What if I unplug that electrical connection close to the steering box..... ( I didn't actually try to unplug that connector, since I just got home 30 mins ago, and it's 1:15 AM).

Any advice will be greatly appreciated.... anyone else go through this? I didn't mind to replace the PS Pump, particularly if it accomplished my goal of quieting things down - but I didn't bargain for this!

Thanks in advance!

Cason234
 

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Check your fluid level. You may have a leak. Other than that, you may have a bad unit. It is a pain to take stuff back, but that is about the only thing you have left.
 

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....I replaced my PS Pump and hoses. Job went smooth, and the PS was nice and quiet. the pump is a remanufactured unit from NAPA.... the hoses are new....... I put the old sensor on the hose near where the box is (I assume this is for the variable rate PS)..... any ideas? What's making the noise? Is this my cue to put a quick ratio steering box in? (only if that's the source of the noise!)...... What if I unplug that electrical connection close to the steering box..... ( I didn't actually try to unplug that connector, since I just got home 30 mins ago, and it's 1:15 AM).
Confirm fluid level first, plan to re-bleed system (assuming you did per FSM when reman pump and new hoses were installed). Beyond that, the gear itself will not be the noisemaker for what you describe, so it's not likely there is any reason to look at changing it out.

What fluid are you using? GM has a couple different formulations, and I recall there was a TSB that said, basically, use the "cold weather" GM fluid to reduce noisy steering conditions. If you aren't using GM fluid, give it a try....yes (of course) it will cost more, but that's WHY--they've done the development work that makes their product the correct one to use to resolve complaints like noise.

Sensor you refer to is actually a switch, to increase idle speed when steering pressure spikes during a situation like parking, when the steering gear may be at lock, to prevent stalling the engine from excess load trying to drive PS pump AND AC compressor while throttle is closed.
 

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I have seen a leaking steering box pitman arm seal cause noise altho it was on a ford.
everything on the suction side of the pump should be checked for tightness, usually its air in the oil causing cavitation noise.
 

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Discussion Starter · #5 ·
Problem solved

Thanks to all for the responses..... I've got the problem fixed, and figured I'd update this thread, in case someone else ever has this and conducts a search:

In replacing the PS lines, (there were two long ones - supply and return to and from the gear box), I also figured I'd replace the 5/8" line from the reservoir to the pump. The factory line has some pretty tight bends, but I replaced it with a piece of straight hose. When I'd installed it originally, there was a slight kink to the hose. I suppose as the PS Fluid warmed up that hose and it relaxed a little, it kinked nearly completely. All the noise was strictly due to the lack of supply of fresh PS fluid. Once I'd removed the hose and installed a new one again, this time rerouted a little better, the problem was solved, and now it sounds like it should, and my Caddy is running better than ever.

On a side note, it's been real fun to buy a car that needed a bunch of little stuff (provided you can buy this car for a reasonable price) and with a little bit of Saturday afternoon and evening wrenching, to turn it into something that runs exactly like it should. There are so many things with any car that can wear out and go bad. If an owner doesn't keep up with them, they can eventually arrive at the point where they think the car is 'worn out', and it's time for a new one. However, the 'core parts' of that car are still excellent! Someone with a little mechanical savvy can pick up plenty of good cars that simply need a little TLC, and have a fine machine that will last them for years and many miles! This car is a good example of that.... there've been a few things that needed attention before it gets to modding for performance. Each one has been greatly rewarding, and has resulted in a significant improvement in the operation of the vehicle. Another example besides the noisy PS pump has been the exhaust manifolds..... when I bought the car, it sounded like it had a bad lifter in the morning..... each time it would start when cold, there would be an audible ticking that would continue for approx. 30 seconds and then go away. I found several loose exhaust manifold bolts. I pulled them, coated them with never-seize, tightened them down, and now it purrs like a kitten when started. The previous owner probably figured it was time to unload the car before something disastrous went wrong, but now the thing runs like it should!

Take care all, and thanks again for the responses.
 
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