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Old 03-24-2012, 04:31 PM
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hissing/humming sound from
Hello Yall,

I have this constant hissing/ humming noise from the my engine bay. My mechanic says my air valve is bad and needs replacement. My car also has a high MPG (6.5). Its an 08 X5 4.8(E70).

Any advice on how I can remedy this would he highly appreciated.

Thanxx
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