Question about 1992 Toyota Pickup

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Black smoke and soot coming out of the exhaust pipe

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Black smoke is caused when the mix of fuel and air becomes un-balanced. Normal mixture is 14.5 parts air to1 part fuel. When the fuel to air mixtures change because of a malfunction the mixture can go as high as 14.5 to 2 or 3, two to three times the proper amount. The black smoke is the excess fuel generated from the rich mixture and can be cause by one of the following:

  • plugged air filter
  • Shorted or stuck fuel injector
  • Failed fuel pressure regulator
  • Vacuum leak
  • Shorted ECM Sensor , scan for any problem codes if possible.

Posted on May 15, 2010

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Could also be an Oxygen sensor located on the exhaust pipe. Be sure to see how many wires it has . Usually they have 4. It depends on the model.

Posted on Nov 11, 2011

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SOURCE: My 1983 toyota pickup runs rough and black soot come from exhaust

carb automatic choke sticking closed or your float setting too high causing flooding engine.

Posted on Nov 19, 2009

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