ANSWERS: 2
  • Likely worn rings and/or valves. When the engine is cold, the metal is smaller allowing gas to leak past into the exhaust. Cars blow black smoke when the exhaust is rich in gas. When the engine warms up, the metal expands and seals the leak.
  • The smoke, could be water vapor in the exhaust system. as the engine heats, the water vapors disappear, due to evaporation.

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