Frequency valve. Comes on at same time as your fuel pump, often for a
second or two after the ignition is turned on. The idlespeed motor also
hums when the ignition is on, though you can usually only hear it when
you've got your head in the engine bay.
Stian Birkeland wrote:
>I'm trying to locate where an annoying buzzing noise is coming from.
>Symptoms:
>
>With the key in the 2 position (right before starting the car)
>there is a buzzing sound from the rear.
>
>What is so special is that:
>
>1) It doesn't buzz each time the key is in the 2 position, and
>2) When it does buzz, there are only about 3 constant buzzes which
>last for the same amount of time, then no more buzzing. Reminds me of
>some sort of reset "back to basic" of an old computer *L*
>
>In a few other cases, there is a totally different buzzer sound
>coming from the engine compartment (ignition coil?) which increases
>in volume before it disappears for good. Sounds like a high current
>buzzing noise.
>
>The symptoms I have described...what can I do to fix them. I would
>think that even if it is a DeLorean ;) it shouldn't sound like this
>or?
>
>Best wishes
>Stian Birkeland
>Norway
>
>VIN # 06759
>
>
>
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