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Old 11-26-2012, 08:22 PM   #472
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 16,580
My Ride: 330CiC, M5, X5
I am at a bit of a loss for ideas on this, but if the car was turned off when you heard this noise, it is likely an Evap pump to test the vehicles Evap system?

If the car was still running, could be Evap pump or noise from the Sucking Jet Pump in the left side of the fuel.
Solve your misfires, lean codes, rough idle -

Fuel pump failures -

Temp Info -

Hidden OBC Menu - Check Voltage, Temp, Fuel Level -

E46/E39 GM5 Door Lock Info -

Lower hose temp switch O-ring - BMW #13621743299
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