Exhaust turbocharger, cylinders 1-4

Initial position (1) of wastegate linkage depressurized.

Wastegate valve opened.

Fig 1: Identifying Initial Position Of Wastegate Linkage Depressurized

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Initial position (1) of wastegate linkage with vacuum pressure.

Wastegate valve closed.

Fig 2: Identifying Initial Position Of Wastegate Linkage With Vacuum Pressure

Courtesy of BMW OF NORTH AMERICA, INC.