Exhaust smoke color indicates specific mechanical problems. Below is the factual interpretation used by mechanics globally.
1. White Smoke
Cold Start White Mist (Normal)
Condensation evaporation.
Persistent White Smoke (Problem)
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Coolant entering cylinders
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Blown head gasket
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Cracked head or block
Evidence:
Sweet smell, overheating, coolant loss.
2. Blue Smoke
Blue smoke = burning oil.
Causes
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Worn piston rings
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Valve stem seals
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Turbo oil seal failure
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PCV system failure
3. Black Smoke
Black smoke = excess fuel (rich mixture).
Causes
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Faulty injectors
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Clogged air filter
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MAF sensor failure
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Fuel pressure regulator failure
Conclusion
Smoke color accurately identifies internal engine problems:
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White = coolant
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Blue = oil
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Black = fuel
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