Humming and revs dropping
Discussion
I drive a S-Type diesel automatic. Recently I have been experiancing a humming noise which last around half a second. And can be a one off or it comes in short bursts right one after the other for 10-15 seconds. Each time the noise comes it feels as though the car slows momentarily. Like there is a loss of power for a second or the brakes are being applied. At the same time the Rev needle drops a few hundred revs and when the noise stops the Rev needle returns to where it was and the braking sensation goes away. Any ideas ?
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