Boost Pressure Test

BOOST PRESSURE, CHECKING

NOTE: Boost pressure can be measured either while driving or on dynamometer

- Engine oil temperature: minimum 80°C (176°F)





- Pull ignition distributor vacuum line off intake manifold (arrow)
- Connect pressure gauge VW 1397 with T-connection, between previously removed vacuum hose and intake manifold
- Place pressure gauge on front passenger seat

NOTE: Do not pinch off hose or restrict in any way when placing gauge inside vehicle.





- Open valve on pressure gauge (arrow)
- Run engine in second gear at 4,000 RPM (full throttle)





- Close shut-off valve on pressure gauge (arrow)





Pressure specification relative to outside temperature

Example
- At 10°C (50°F) pressure should be 0.42 bar (6.1 psi)

If specified values are NOT obtained:
- Replace wastegate as a test measure

If value is still NOT obtained:
- Reinstall original wastegate valve, perform trial replacement of turbocharger (after repeated pressure tests)