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High Pitched Whine

My '00 Mitsubishi Eclipse recently started making a high pitched whine as I accelerate. Is this anything I should be worried about?

If you rev up the engine in park or neutral, do you get the same whine? We need to figure out if it’s the engine, transmission, wheel bearings, tires, or what.

Try different things to isolate what might me causing it, ie coast in neutral or press on the brake pedal lightly. Figure out all the conditions that cause it and variables that make it go away, otherwise we don’t have enough clues to know anything.

The whine disappears in both park and neutral and stops after I get into fourth gear and have stopped accelerating. It starts again when I accelerate. When I let off the accelerator or brake it also stops.