Golf GLS L4-1.8L Turbo (AWW) (2001)
Overboost Valve: Testing and Inspection
Overrun shut-off valve, checking
Special tools, workshop equipment, testers, measuring instruments and auxiliary items required
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V.A.G 1390 Hand vacuum pump
Test conditions
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Reduced performance or load change shudders
Test sequence
Note: The overrun shut-off valve is located in front of the turbocharger. It is opened by vacuum pressure during the overrun phase and at idling
speed.
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Connect hand vacuum pump V.A.G 1390 to vacuum connection on overrun valve.
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Operate hand vacuum pump. Overrun valve must open in direction of arrow.
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Operate vent valve on hand vacuum pump. Overrun valve must close.
Overrun valve does not open or close, replace valve.
Note: The overrun shut-off valve connections are secured with screw-type clips.