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Possibly, here's a little info on the crankcase (archive)

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Posted by Bill R. on October 20, 2001 at 00:42:45:

In Reply to: Is this a symptom of cyclone valve failure when posted by Chris on October 19, 2001 at 20:12:31:

ventilation system.
there is a buzzing noise like electric fuel pump working when car is started and it comes from around the coolant reservoir. This buzz never appears when the car is started with a bit of gas.

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