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You could have an ignition problem, such as defective spark plug wire or distributor cap or if it's an older car you might not have resistor spark plugs.

I have also seen cars with defective alternators do this, as you rev the engine the noise seems to go to a higher frequency.

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Q: What would cause car speakers to make static sound even when car is off?
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Blown speakers, bad wiring or radio problems.

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