Question about 1996 Nissan Sentra

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Nissan b14 rough idle, black smoke

Help!
GA 15 engine, has been rough idling initially and even cutting off sometimes, engine smokes black and has almost doubled its fuel consumption. i have chaged the throttle body, distributor coil pack, plug wires, plugs, distributor cap, condenser, ran a number of injector cleaners through the fuel, took out injectors and cleaned outer surface and nozzles, even removed the cat convertor, but problem still persists!!!

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  • banarjib3 Dec 03, 2008

    i have a b14 with a rough idle,keeps stalling, uses gas as if it is out of style.i have changed the air filter-no improvement. i am going to service the idle sensor.will keep u up to date.

  • Anonymous May 10, 2009

    GA 15 engine, has been rough idling initially and even cutting off sometimes, engine smokes black and has almost doubled its fuel consumption. i have chaged the throttle body, distributor coil pack, plug wires, plugs, distributor cap, condenser, ran a number of injector cleaners through the fuel, took out injectors and cleaned outer surface and nozzles, even removed the cat convertor, but problem still.

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I have a nissan b-14 idle roughly sometimes cut off when in traffic. any solutions???????

Posted on Dec 01, 2009

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Problem solved by changing a fuel regulator on the fuel mono rail return line.

Posted on Oct 04, 2008

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Engine heat , black smoke , high consumption of fuel , and poor pick up are the problems.

Posted on Oct 09, 2013

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Have you looked into the fuel pressure regulator?

Posted on Jul 19, 2012

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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.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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I have a 92 blazer 4.3 vortec


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.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day

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