Question about 1995 Nissan Altima

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BLACK SMOKE I have a NIssan Altima 1995 model. It takes in excess fuel and the bumber at the back gets black any day I drove out.

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  • Anonymous Jul 09, 2008

    Im pretty sure you have check the fuel/air mixture control.. Its just like my problem and its running fine right now..Remove the fuel/air mixture control and spray a bit of carb/injection cleaner ot it.Then close the mixture all the way and open it 1 1/2 turn...and start the engine....

  • Anonymous Mar 15, 2014

    black smoke,bad missfire,sluggish,burns rich,excessive fuel consumption

  • Anonymous Mar 15, 2014

    black smoke,bad missfire,sluggish,burns rich,excessive fuel consumption

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1 Answer

Im pretty sure you have check the fuel/air mixture control.. Its just like my problem and its running fine right now..Remove the fuel/air mixture control and spray a bit of carb/injection cleaner ot it.Then close the mixture all the way and open it 1 1/2 turn...and start the engine.......
or check the idler vacuum sensor if its working this part is controlling the mixture during idle rpm

Posted on Jul 09, 2008

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Black smoke>fuel consumption>rough idle


Hi there:
Black smoke is caused by excess fuel that has entered the cylinder area and cannot be burned completely. Another term for excess fuel is "running rich." Poor fuel mileage is also a common complaint when black smoke comes out of the tailpipe. Black smoke out the tailpipe is the least cause for alarm. Excess fuel will usually effect engine performance, reduce fuel economy, and produce a fuel odor.

How did the fuel get into the cylinder in the first place? Some of the causes of excess fuel are a carburetor that is out of adjustment, a faulty fuel pump, a leaky fuel injector, or a faulty engine computer or computer sensor. If black smoke is present, check the engine oil as in the white smoke example to make sure excess fuel has not contaminated it. Do not start the engine if a heavy, raw fuel smell can be detected in the engine oil. Call your mechanic and advise him of what you have found.

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