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How can i test a mass air flow sensor on a 2004 GMC Enovy XLT 4.2L?

The engine running rough and black smoke coming from tail pipe i believe it could be the mass air flow sensor the sensor is mount on the side of the throttle.

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Unplug it and see if the idle smooths out

Posted on May 17, 2017

  • 2 more comments 
  • Joe Russell May 17, 2017

    when i unplug the air flow sensor the engine do run better and idle up high and stumble when press on gas pedal and when i connect the wire back to the air flow sensor it run rough and black smoke come out of tail pipe do the engine suppose to cut off when i disconnect the air flow sensor?

  • Rocguy May 18, 2017

    It wouldn't surprise me if it died at first. The computer will need to adjust for it not being there. Here is a link with test info.
    http://www.autozone.com/repairinfo/commo...

  • Joe Russell May 18, 2017

    there have been a mistake made. correction i am working on a 1989 nissan d21 hard body 2.4L
    when i unplug the air flow sensor the engine do run better and idle up high and stumble when press on gas pedal and when i connect the wire back to the air flow sensor it run rough and black smoke come out of tail pipe do the engine suppose to cut off when i disconnect the air flow sensor? the sensor is connected to the side of the throttle body.

  • Joe Russell May 20, 2017

    there have been a mistake made. correction i am working on a 1989 nissan d21 hard body 2.4L
    when i unplug the air flow sensor the engine do run better and idle up high and stumble when press on gas pedal and when i connect the wire back to the air flow sensor it run rough and black smoke come out of tail pipe do the engine suppose to cut off when i disconnect the air flow sensor? the sensor is connected to the side of the throttle body.

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