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. |
| 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. |
| 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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