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Home >> BMW >> 2011 >> X5 35d >> Repair and Diagnosis >> Engine Mechanical >> Blowers, Superchargers & Turbochargers >> Functional Description - Engine Performance & Emissions - Except Diesel >> Engine Performance & Emissions, Gasoline Engine - Functional Description >> Turbocharger check on the N63/N74 engine >> 2) Check blow-off valve

2) Check blow-off valve

If a blow-off valve does not close, i.e. is stuck open, sufficient charging pressure can normally not be built up. The blow-off valves are electrically activated. The piston of a blow-off valve is not pre-tensioned with a spring but rather moved by air pressure. Through current supply, the blow-off valve is closed against this air pressure. A blow-off valve which is jammed open is possibly indicated by whistling noises. A blow-off valve which is jammed closed is possibly indicated by noises (fluttering) when the foot is taken off the accelerator pedal.

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