Possible Cause

Possible Remedy

Restricted engine crankcase breather

Refer to engine manufacturer's manual, clear restriction

Turbocharger bearing housing sludged or coked

Change engine oil and oil filter, overhaul or replace turbocharger as required

Fuel injection pump or fuel injectors incorrectly set

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

Engine valve timing incorrect

Refer to engine manufacturer's manual for correct settings and adjust

Worn engine piston rings or liners

Refer to engine manufacturer's manual and repair as required

Burnt valves and/or pistons

Refer to engine manufacturer's manual and repair as required

Excessive dirt build up on compressor wheel and/or diffuser vanes

Clean in accordance with details/instructions from Steve Boyle at UFI

Turbocharger damaged

Find and correct cause of failure, repair or replace turbocharger as necessary

Failed diaphragm

Replace using correct actuator service kit

Seized valve

Free valve/replace complete turbine housing sub-assembly

Leaking hose

Replace hose and clips

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 in feed from air cleaner to compressor

Replace seals, gaskets or tighten fastners as required

Air leak in feed from compressor to intake manifold

Replace seals, gaskets or tighten fastners as required

Air leak beween intake manifold and engine

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

Foreign object in exhaust manifold (from engine)

Refer to engine manufacturer's manual and remove obstruction

Restricted exhaust system

Remove restriction or replace damaged parts as required

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

Restricted turbocharger oil drain line

Remove restriction or replace damaged parts as required