Black Exhaust Smoke

1. Restricted air intake duct to turbocharger compressor.
2. Restricted air outlet duct from compressor to intake manifold.
3. Restricted intake system.
4. Air leak in duct from compressor to intake manifold.
5. Air leak at intake manifold to engine mating surface.
6. Restricted exhaust system.
7. Exhaust gas leak in turbine inlet to exhaust manifold.
8. Incorrect camshaft timing.
9. Internal engine problem. Engine blow-by, worn or damaged pistons, rings or valves.
10. Dirt on compressor wheel and or diffuser vanes.
11. Damaged turbocharger.