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Q: When I start the car up I hear a hummimg sound. Even when I press the gas pedal I can hear it. What could this humming sound be?

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Had my accelerator pedal changed a few months ago. Since then I've been hearing a humming sound when I start the car up and press the gas pedal.. Took it back to mechanic he said it was my power steering and he changed the pump I think . The noise was not as loud as it was,but very faint. After a while the humming came back. I got my money back from that mechanic because it seems as though he was trying to guess at what it was.

My car has 127000 miles.
My car has an automatic transmission.

Hi there:

In many instances, a humming noise will be caused by a loose serpentine or drive belt, the power steering pump (which the other mechanic determined wasn’t so) or even a vacuum leak perhaps within the EVAP or EGR emissions system. However, since all of these would be guesses, it’s best to have a professional mobile mechanic complete a car is making a noise inspection first, so they can eliminate the guess work and determine where the noise is coming for; and the right repairs can be made.

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