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Diagnosis of Engine Problems

Engine stalls during acceleration
Cause Remedy
High boost pressure, triggering ignition cut out switch.
Check wastegate and actuator operation. replace faulty parts as required.

ENGINE LACKS POWER
Cause Remedy
Clogged air filter element.
Replace element according to engine manufacturers recommendations.
Obstructed air outlet duct from compressor to intake manifold.
Remove obstruction or replace damaged parts as required.
Obstructed intake manifold.
Refer to engine manufacturers manual & remove obstruction.
Air leak in duct from compressor to intake manifold.
Correct leak by replacing seals or tightening fasteners as required.
Obstruction in exhaust manifold.
Refer to engine manufacturers manual & remove obstruction.
Restricted exhaust system.
Remove obstruction or replace faulty components as required
Gas leak in exhaust manifolds to engine joint.
Refer to manufacturers manual & replace gaskets or tighten fasteners as required.
Gas leak in turbine inlet to exhaust manifold joint.
Replace gasket or tighten fasteners as required.
Fuel system defective or malajusted.
Refer to engine manufacturers manual — replace or adjust faulty component(s) as required.
Engine camshaft timing incorrect.
Refer to engine manufacturers manual & replace worn parts.
Worn engine piston rings or liners (blowby).
Refer to engine manufacturers manual & repair engine as required.
Internal engine problem (valves, pistons).
Refer to engine manufacturers manual and repair engine as required.
Dirt caked on compressor wheel and/or diffuser vanes.
Clean using a Non-Caustic cleaner & Soft Brush. Find & Correct source of unfiltered air and change engine oil & oil filter.
Damaged turbocharger.
Find the correct cause of failure, replace turbocharger as required.
Turbocharger wastegate malfunction.
Check wastegate and actuator operation.

BLACK EXHAUST SMOKE
Cause Remedy
Clogged air filter element.
Replace element according to engine manufacturers recommendations.
Obstructed air intake duct to turbo compressor
Remove obstruction or replace damaged parts as required.
Obstructed air outlet duct from compressor to intake manifold.
Remove obstruction or replace damaged parts as required.
Obstructed intake manifold.
Refer to engine manufacturers manual & remove obstruction.
Air leak in duct from compressor to intake manifold.
Correct leak by replacing seals or tightening fasteners as required.
Air leak at intake manifold to engine joint.
Refer to manufacturers manual & replace gaskets or tighten fasteners as required.
Obstruction in exhaust manifold.
Refer to engine manufacturers manual & remove obstruction.
Restricted exhaust system.
Remove obstruction or replace faulty components as required.
Gas leak in exhaust manifolds to engine joint.
Refer to manufacturers manual & replace gaskets or tighten fasteners as required.
Gas leak in turbine inlet to exhaust manifold joint.
Replace gasket or tighten fasteners as required.
Fuel system defective or malajusted.
Refer to engine manufacturers manual — replace or adjust faulty component(s) as required.
Engine camshaft timing incorrect.
Refer to engine manufacturers manual & replace worn parts.
Worn engine piston rings or liners (blowby).
Refer to engine manufacturers manual & repair engine as required.
Internal engine problem (valves, pistons).
Refer to engine manufacturers manual and repair engine as required.
Dirt caked on compressor wheel and/or diffuser vanes.
Clean using a Non-Caustic cleaner & Soft Brush. Find & Correct source of unfiltered air and change engine oil & oil filter.
Damaged turbocharger.
Find the correct cause of failure, replace turbocharger as required.

EXCESSIVE ENGINE OIL CONSUMPTION
Cause Remedy
Clogged air filter element.
Replace element according to engine manufacturers recommendations.
Obstructed air intake duct to turbo compressor.
Remove obstruction or replace damaged parts as required.
Air leak in duct from compressor to intake manifold.
Correct leak by replacing seals or tightening fasteners as required.
Obstructed turbocharger oil drain line.
Remove obstruction or replace line as required.
Obstructed engine crankcase vent.
Refer to engine manufacturers manual, clear obstruction.
Turbocharger centre housing sludged or coked.
Change engine oil & oil filter, overhaul or replace turbo as required.
Worn engine piston rings or liners (blowby).
Refer to engine manufacturers manual & repair engine as required.
Dirt caked on compressor wheel and/or diffuser vanes.
Clean using a Non-Caustic cleaner & Soft Brush. Find & Correct source of unfiltered air and change engine oil & oil filter.
Damaged turbocharger.
Find the correct cause of failure, replace turbocharger as required.

BLUE EXHAUST SMOKE
Cause Remedy
Clogged air filter element
Replace element according to engine manufacturers recommendations.
Obstructed air intake duct to turbo compressor.
Remove obstruction or replace damaged parts as required.
Air leak in duct from compressor to intake manifold.
Correct leak by replacing seals or tightening fasteners as required.
Obstruction in exhaust manifold.
Refer to engine manufacturers manual & remove obstruction.
Obstructed turbocharger oil drain line.
Remove obstruction or replace line as required.
Obstructed engine crankcase vent.
Refer to engine manufacturers manual, clear obstruction.
Turbocharger centre housing sludged or coked.
Change engine oil & oil filter, overhaul or replace turbo as required.
Worn engine piston rings or liners (blowby).
Refer to engine manufacturers manual & repair engine as required.
Internal engine problem (valves, pistons).
Refer to engine manufacturers manual and repair engine as required.
Dirt caked on compressor wheel and/or diffuser vanes.
Clean using a Non-Caustic cleaner & Soft Brush. Find & Correct source of unfiltered air and change engine oil & oil filter.
Damaged turbocharger.
Find the correct cause of failure, replace turbocharger as required.

TURBOCHARGER NOISY
Cause Remedy
Obstructed air intake duct to turbo compressor.
Remove obstruction or replace damaged parts as required.
Obstructed air outlet duct from compressor to intake manifold.
Remove obstruction or replace damaged parts as required.
Obstructed intake manifold.
Refer to engine manufacturers manual & remove obstruction.
Air leak in duct from air cleaner to compressor.
Correct leak by replacing seals or tightening fasteners as required.
Air leak in duct from compressor to intake manifold.
Correct leak by replacing seals or tightening fasteners as required.
Air leak at intake manifold to engine joint.
Refer to manufacturers manual & replace gaskets or tighten fasteners as required.
Obstruction in exhaust manifold.
Refer to engine manufacturers manual & remove obstruction.
Gas leak in turbine inlet to exhaust manifold joint.
Replace gasket or tighten fasteners as required.
Gas leak in ducting after the turbine outlet.
Refer to manufacturers manual & repair leak.
Dirt caked on compressor wheel and/or diffuser vanes.
Clean using a Non-Caustic cleaner & Soft Brush. Find & Correct source of unfiltered air and change engine oil & oil filter.
Damaged turbocharger.
Find the correct cause of failure, replace turbocharger as required.

CYCLIC SOUND FROM TURBOCHARGER
Cause Remedy
Obstructed air intake duct to turbo compressor.
Remove obstruction or replace damaged parts as required.
Dirt caked on compressor wheel and/or diffuser vanes.
Clean using a Non-Caustic cleaner & Soft Brush. Find & Correct source of unfiltered air and change engine oil & oil filter.

OIL LEAK FROM COMPRESSOR SEAL
Cause Remedy
Clogged air filter element.
Replace element according to engine manufacturers recommendations.
Obstructed air intake duct to turbo compressor.
Remove obstruction or replace damaged parts as required.
Obstructed air intake duct to turbo compressor.
Refer to engine manufacturers manual & remove obstruction.
Restricted exhaust system.
Remove obstruction or replace faulty components as required.
Gas leak in exhaust manifolds to engine joint.
Refer to manufacturers manual & replace gaskets or tighten fasteners as required.
Gas leak in turbine inlet to exhaust manifold joint.
Replace gasket or tighten fasteners as required.
Obstructed turbocharger oil drain line.
Remove obstruction or replace line as required.
Obstructed engine crankcase vent.
Refer to engine manufacturers manual, clear obstruction.
Turbocharger centre housing sludged or coked.
Change engine oil & oil filter, overhaul or replace turbo as required.
Worn engine piston rings or liners (blowby).
Refer to engine manufacturers manual & repair engine as required.
Internal engine problem (valves, pistons).
Refer to engine manufacturers manual and repair engine as required.
Dirt caked on compressor wheel and/or diffuser vanes.
Clean using a Non-Caustic cleaner & Soft Brush. Find & Correct source of unfiltered air and change engine oil & oil filter.
Damaged turbocharger.
Find the correct cause of failure, replace turbocharger as required.

OIL LEAK FROM TURBINE SEAL
Cause Remedy
Gas leak in ducting after the turbine outlet.
Refer to manufacturers manual & repair leak.
Obstructed turbocharger oil drain line.
Remove obstruction or replace line as required.
Obstructed engine crankcase vent.
Refer to engine manufacturers manual, clear obstruction.
Turbocharger centre housing sludged or coked.
Change engine oil & oil filter, overhaul or replace turbo as required.
Worn engine piston rings or liners (blowby).
Refer to engine manufacturers manual & repair engine as required.
Internal engine problem (valves, pistons).
Refer to engine manufacturers manual and repair engine as required.
Dirt caked on compressor wheel and/or diffuser vanes.
Clean using a Non-Caustic cleaner & Soft Brush. Find & Correct source of unfiltered air and change engine oil & oil filter.
Damaged turbocharger.
Find the correct cause of failure, replace turbocharger as required

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