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With the hood open have someone rev the motor until the noise comes back, make sure you are clear of any moving part, listen for the noise and locate, is it a bearing (high pitch) could it be the belt tensioner? Use a long metal screw driver as a stethoscope hold to your ear and the metal part to any non moving parts or suspect parts. You will be surprised how many noises can be heard this way and you can usually find it

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Q: Your car engine is making a humming sound that stops at low rpm when car is stopped at a light Sounds like it could be the alternator or a pump Any ideas?
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