This could be due to many factors. The first thing that I would like to ask you is how many miles are on the truck? How often do you do maintenance? Oil change? Transmission fluid and filter change? Air filter change? Please answer these and I will be able to help you further thank you.
SOURCE: 1993 Gmc Seirra Power Steering
You will have to remove the serpintine belt off take off the Hoses from the steering box be carefull not to strip them out, use some WD-40 or something the make it easier if they wont come off take your time and work them back and forth, If your just doing the pump then take the hoses off the pump not the steering box, take the retaining bold out of the steering pump and it should come right off.
SOURCE: My 1993 GMC Seirra SLE loses power when going from sea level to 3,000 ft and then starts ticking
Hello
The engine
and transmission in this cars drive train are fully
electronically controlled by a computer called the PCM (Power Train
Control Module). Whenever a problem like this occurs the computer
stores a record of the problem (there are of course some exceptions
to this, like the fuel pump for instance) in the form of a fault code
in its memory, to read these fault codes you must have the systems
memory scanned with a special tool. Once the fault code(s) are read
you then must perform the appropriate diagnostic testing to find and
resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL THE
DIAGNOSIS & TESTING IS COMPLETED.
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