Turbocharger: Testing and Inspection

NOTE: In order to assure proper operation of the turbocharger and to reach the specified boost pressure:

- There should be no leaks on intake or exhaust side
- Hose to wastegate must not be plugged, loose or leaking
- Engine and fuel system must be operating properly e.g. pump delivery, valve clearance, compression pressure and injectors

NOTE: Boost pressure must be measured with engine at full throttle while driving on road or dynamometer. Test time per measurement should not exceed 10 seconds.





- Disconnect hose between intake manifold (1) and injection pump (2), then connect together with T-connection of pressure gauge.





- Route gauge inside car to passenger seat or dashboard, being careful not to pinch vacuum hose between hood and body.





- Open gauge by pushing in direction of arrow
- Measure boost pressure with engine at full throttle
- On dynamometer: in 3rd gear or in 2nd range at 4,000 rpm
- On road test: in 2nd gear or in 1st range and slowing to approx. 60 km/h (38 mph)
- Read boost pressure on gauge
- Specification: 0.64 - 0.72 bar (9.1 to 10.2 psi)





NOTE: In order to facilitate reading the boost pressure while driving, the value can be stored by closing the pressure gauge (direction of arrow).

If Boost pressure too high:
- Replace turbocharger (since wastegate is defective)

If Boost pressure too low:
- Disconnect blow-off valve hose from intake air hose and plug with a 25 mm (0.985 in) plug and tighten with clamp





Repeat Boost Pressure Test:

If boost pressure OK:
- Replace blow-off valve

If boost pressure still too low:
- Replace turbocharger