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Buzzing/Humming 850 1997

posted by  Mike 850 GLT on  Tue Apr 19 06:56 CST 2005
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I agree with Klaus. It's probably the air pump located under the battery tray. The original check valve design would allow moisture to acumulate and condense in the hoses and at the bottom of the hoses is the pump. I replaced mine 2 years ago but did not do the check valve. If I do it again I'll do the valve too. I drilled a couple 1/8th inch drain holes in my pump but i don't know if is helping keep it dry or not. I just reset a Code 410 over the weekend. Secondary air system fault.






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