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Old 01-13-2013   #5
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Default Re: Vacuum pump? Why does it buzz every 10 seconds? [snappic]

Quote:
Originally Posted by ghlkal View Post

...increase the revs until you can't hear it anymore
That's otherwise known as the HGIH or High Gear Indicator Hum. It's an indicator that you are at least 2 gears too high.
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