Possible Cause

Possible Remedy

Fuel injection pump or fuel injectors incorrectly set

Refer to engine manufacturer's manual and replace or adjust faulty components

Seized valve

Free valve/replace complete turbine housing sub-assembly

Wastegate mechanism set incorrectly

Contact United Fuel Injection for correct setting details

Dirty air cleaner

Clean or replace element according to manufacturer's recommendations

Restricted compressor intake duct

Remove restriction or replace damaged parts as required

Restricted air duct from compressor to intake manifold

Remove restriction or replace damaged parts as required

Restricted intake manifold

Refer to engine manufacturer's manual and remove restriction

Air leak beween intake manifold and engine

Refer to engine manufacturer's manual and replace gaskets or tighten fastners

Exhaust manifold cracked, gaskets blown or missing

Refer to engine manufacturer's manual and replace gaskets or damaged parts

Gas leak at turbine inlet/exhaust manifold joint

Replace gasket or tighten fasteners as required

Gas leak in ducting after turbine outlet

Refer to engine manufacturer's manual and repair leak