1988 Ford E-150 Econoline XL 8 Cyl 5.0L
makes a whining noise when running, almost like its loosing compression in the motor, but not really sure.
Power steering pump on a Ford is good for this . When running turn the steering wheel . Does it turn hard or make a louder whining noise ? Check fluid . Make sure belt is tight . Last . Might just need a new pump . Start there if motor seems to run ok .