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Home >> Audi >> 2003 >> RS 6 >> Repair and Diagnosis >> Engine Mechanical >> Blowers, Superchargers & Turbochargers >> Exhaust System, Emission Controls - 4.2L V8 5V BITURBO - BCY >> Charge air system with turbocharger, testing >> Mechanical air recirculation valve, testing >> Notes

Mechanical air recirculation valve, testing: Notes

NOTE:
  • Mechanical air recirculation valve is located upstream of turbochargers. It is opened by vacuum from Recirculating valve for turbocharger -N249- when engine is on overrun or when idling or under part load. This disperses pressurized air (charge pressure) upstream of throttle valve, and thus keeps turbochargers rotating at a higher speed.
  • Check air recirculation valve if engine is not producing full power, or jerking when throttle is opened and closed.
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