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 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 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. |
| 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. |
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