MASS AIR FLOW SENSOR

  • Tiny
  • dogsareyou79
  • 1994 Nissan Quest
  • 6 CYL
  • FWD
  • automatic
  • 111,000 miles

I have black smoke comming from tailpipe I have changed the mass air flow sensor, did a wire check, changed disribater cap and button, new spark plugs, wires. But when the sensor is pluged up it is running rich. When it is unpluged car runs fine. Any ideas on what I might have missed

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Saturday, August 6th, 2011 AT 8:38 PM

5 Replies

  • Tiny
  • Docfixit
  • Expert
  • 18,993 posts

Most likely a faulty Crankshaft position sensor inside DIST.

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Saturday, August 6th, 2011 AT 8:43 PM
  • Tiny
  • dogsareyou79
  • Member

Had that check keep getting a code 12 mass air flow short

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Saturday, August 6th, 2011 AT 8:52 PM
  • Tiny
  • Wrenchtech
  • Expert
  • 20,250 posts

You have a problem in the Mass Air Flow circuit but not necessarily the sensor itself. It could be any of the related wiring or the computer itself. It needs to be troubleshooted by a technician.

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Saturday, August 6th, 2011 AT 8:59 PM
  • Tiny
  • dogsareyou79
  • Member

Thats what I was thinking but I hoped it was something simple

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Saturday, August 6th, 2011 AT 9:06 PM
  • Tiny
  • Docfixit
  • Expert
  • 18,993 posts

What happened

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Wednesday, August 10th, 2011 AT 8:46 PM

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