Possible Cause

Possible Remedy

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 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

Restricted exhaust system

Remove restriction or replace damaged parts as required