How a VW engine VNT turbo works and how turbo fail. VW turbo have a limited time to proper work. Turbo boost problems, turbo actuator not working, black smoke, blue smoke white smoke or turbo no power.
Of course, one should begin by checking current data read during a road test
Derived boost pressure control, pressure control solenoid boost, etc
Of course you can check the status of the compressor wheel after dropping air duct.
Once the turbine is a little more difficult, because little can be seen without dismantling the housing.
You can also assess the impeller clearance, but his assessment requires some experience.
Besides, you can check the operation of a relief valve or the variable geometry - if it works smoothly and in a full range of motion.
Next - oiling the compressor or turbine.
The problem is that very often occurs, and not always accompanied by damage to the turbocharger
In fact, only a verification of the turbocharger is its demolition "to smithereens". The problem lies in the fact that when these turbocharger needs to
be regenerated or scrap
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