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Home >> Audi >> 2016 >> S5 Prestige, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 2 (1.8L - Turbo Engine Mechanical, Engine Code(S): AMB) >> 21 - Turbocharger, G-Charger >> Charge pressure leak test with VAG1687 >> Mechanical air recirculation valve, checking >> Notes

Mechanical air recirculation valve, checking: Notes

WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, and 2003 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • The mechanical air recirculation valve is located upstream of turbocharger. It is opened by vacuum via the Recirculating valve for turbocharger N249 when the engine is on overrun, idling and partial load. This reduces charge air pressure upstream of throttle valve, thereby keeping turbocharger rotating at higher speed.
  • Check the mechanical air recirculation valve if the engine is not producing full power or if it jerks when the throttle is opened and closed.

Special tools, testers and auxiliary items required 

Fig 1: Identifying Hand Vacuum Pump V.A.G. 1390
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