Turbo Charger Diagnostics table

As you can see from our table below, similar symptoms can occur with different faults on your vehicle. Our experienced mechanics are here to help and advise you on your vehicle so please do not hesitate to speak to us to determine the exact course of action required to address your problem. 

 

Feel free to use this as a guide to some of the symptoms that occur with faults relating to your vehicle. 

Common Faults and Symptoms Check

Air Starvation:-

Loss of Power

Black Smoke

Blue Smoke

Excessive Oil Consumption

Noisy turbo charger 

Excessive Oil Turbine End

Excessive Oil Compressor End

Check Air Filter,

Check Air Pipes

Check for loose/

leaking connections

Boost Pressure Loss:

Loss of Power

Black Smoke

Noisy Turbo Charger

Excessive Oil Compressor End

Check turbo engine ducting,

turbine housing connections,

inlet manifold and gaskets

Exhaust Pressure Loss:-

Loss of Power

Black Smoke

Noisy Turbo Charger

Exhaust manifold/gaskets loose/damaged/leaking 

Turbo mounting loose

Excessive Exhaust Back Pressure:-

Loss of Power

Black Smoke

Oil in Exhaust Manifold

Noisy Turbo Charger

Exhaust system

may be damaged

Engine Crankcase Pressure:-

Blue Smoke

Excessive Oil Consumption

Centre Housing Coked

Rating Assembly Binding

Excessive Oil Compressor End

Excessive Oil Turbine End

Crankcase breather

cleanliness

Lack of Lubrication:-

Excessive Oil Consumption

Noisy Turbo Charger

Compressor Wheel Damaged

Turbine Wheel Damaged

Rating Assembly Binding

Centre Housing Coked

Check oil for cleanliness,

quantity. Feed pipe may

be restricted or leaking.

Excessive Lubrication:-

Blue Smoke

Excessive Oil Consumption

Oil in Exhaust Manifold

Excessive Oil Turbine End

Excessive Oil Compressor End

Oil drain from

turbo restriction

Poor compression:-

Loss of Power

Black Smoke

Valve condition or timing,

piston and ring wear/burning

Oil in Combustion Chamber:-

Blue Smoke

Excessive Oil Consumption

Oil in Exhaust Manifold

Excessive Oil Turbine End

Valve and guide condition,

pistoning ring wear

Prolonged Idling:-

Blue Smoke

Excessive Oil Consumption

Oil in Exhaust Manifold

Excessive Oil Turbine End

Excessive Oil Compressor End

Operating conditions

Foreign Parts Included:-

Loss of Power

Black Smoke

Noisy Turbo Charger

Compressor Wheel Damaged

Rating Assembly Binding

Air cleaner fitted/complete,

missing parts

Foreign Parts in Exhaust:-

Loss of Power

Black Smoke

Noisy Turbo Charger

Missing parts or damaged

turbine housing

Vibration:-

Noisy Turbo Charger

Compressor Wheel Damaged

Turbine Wheel Damaged

Rating Assembly Binding

Check Turbo mounting

Oil lag:-

Rating Assembly Binding

Check initial start

acceleration isnt excessive

Cold Operation:-

Compressor Wheel Damaged

Ensure turbo is run

at light load before use

Faulty Turbo Charger:-

Loss of Power

Black Smoke

Blue Smoke

Excessive Oil Consumption

Oil in Exhaust Manifold

Noisy Turbo Charger

Centre Housing Coked

Rating Assembly Binding

Turbine Wheel Damaged

Compressor Wheel Damaged

Excessive Oil Compressor  End

Excessive Oil Turbine End

Remove turbo charger

and send for specialist

check or overhaul

Car goes into Limp mode

Sticky VNT System

 

 
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