1.      Air leakage noise

A.      Air leakage at engine exhaust manifold,turbine wheel and tail pipe,check according to exhaust trace

B.      Air leakage at engine intake manifold or compressor end,check by soapy water.

2.      Mechanicalness noise

A.      The amount of unbalance is oversized

B.      Abnormal object come into turbocharger

C.      Blade rubs the housing

D.     Fastener loosen

3.      Surge

A.      Mismatching

B.      Air inlet is blocked

When you found your turbocharger is failure,firstly please check according to the failure diagnosis table as below: