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FAQ:

Black Smoke?  White Smoke?


Diagnosing Engine Problems from Exhaust Smoke Color



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Common Causes Of Vehicle Smoke

Courtesy of the Bay Area Air Quality Management District Website



VISIBLE SIGN
DIAGNOSIS
POSSIBLE CAUSES
Black or Gray Smoke Incomplete fuel combustion

  • Engine too cold (no repair needed)
  • Clogged air filter
  • Carburetor, choke, fuel injection or emission system malfunction
  • Ignition timing off
  • Blocked manifold
Blue Smoke Engine oil being burned

  • Oil leaking into combustion chamber
  • Worn piston rings, valves or cylinders
White Smoke Coolant and/or water being vaporized in combustion chamber

  • Engine too cold (no repair needed)
  • Head gasket leaking
  • Cracked block or cylinder head


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