SOURCE: HIGH PITCHED WHINE IN THE BACK and under MY 1991 FORD EXPLORER
Could be the electric fuel pump if so equipped. What area(s) of the car the the fuse control, that should give you a hint. Some cars have a fuel pump system that the pump kicks on and off to keep proper fuel pressure up in the fuel lines. If not working right will run battery down in a few days.
SOURCE: high pitch noise under hood not belt
It could be the IAC (idle air control) valve that is mounted on the throttle body. There was an update for these as some of them made a very loud whistling sound when they got a little older.
SOURCE: 02 Ford Ranger has no power and high pitch squeal under hood
The alternator or ac is dragging down the serpentine belt ?
You could take the belt off and see if the noise stops.
SOURCE: Need Under the hood fuse diagram for 98 Ford Ranger 4X4
parts store or dealer can give printout..
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you must take off belt and check the belt tensioner pulley and the idler pulley by actually holding the pulley's in your hand and putting one finger through the center hole and spin it on your finger and also turn the inside with your finger this is so you can feel any vibration coming from it there should be 100% smooth feeling no catching in the movement if there is the inside has dried up and the ball bearings are worn and catching which will cause the load whining noise at high rpm's if you don't find this at those pulley's bearings there is one more to check after reassembly of the pulley's and belt start the engine and let it idle fi you still hear it now turn on the a/c and see if it gets worse/louder while at idle if so now it should get a lot louder when you step on the gas and this whining noise will be the bearing in the a/c drive pulley which needs to be changed you can do it yourself without taking the compressor out in some cases Good Luck Stephen
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