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Mass air flow sensor

Tiny
DOGSAREYOU79
  • MEMBER
  • 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
  • MECHANIC
  • 18,828 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
  • 3 POSTS
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
  • MECHANIC
  • 20,757 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
  • 3 POSTS
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
  • MECHANIC
  • 18,828 POSTS
What happened
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Wednesday, August 10th, 2011 AT 8:46 PM

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