Dark smoke while accelerating
Audi a6 allroad 2,5 tdi. Feels like it losts power too in torque.
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852580
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It is either burning oil or burning too much gas. Black smoke it too much gas - or diesel.
Could be bad piston rings or valve seals for the oil, or bad injectors or sensors for the gas.
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I did a Carbon clean in the exact same model and worked some what then I had a mechanic remove the part of the exhaust mechanism that puts some of the exhaust back into the cylinders which worked perfectly and gave a little more power.
I assume it's a black smoke, but to be sure can tell me the color of the smoke it's either black or blue.
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