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When i just turn the power to my car on, a part under the hood starts getting really loud, and starts shaking but i don't know what it is
I can see what it is shaking and makign the noise, but it is not numbered in the booklet i got with the car.
try to describe the part and its location I might then be able to help you out better. Many things could cause this to happen, and do you mean that your car isn't running but you have the key in the on position and it makes the noise.

