When I start of sounds like squeaky pulley at around 1200 rpm, I let of the gas and noise stops. Someone said it could be the PCV valve?
Is the sound constant or only when you accelerate? If its constant, it could be the PCV valve pipe (had experienced). If its only when you accelerate, than check the engine oil cap. Sometimes the rubber become loose or out of place and it will make a whining/squeaky sound. Clean it or buy new one if its missing the rubber-O ring. Had it happen to me and I just clean it with a towel and no more whining/squeaky sound.
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