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I recently installed a 96 motor in my 1990 240sx , I use the complete harness from a 92 , I am getting error code 12 from the ecu , car is running very rich , lot's of backfire and black smoke .
The idle only change when I unplug the maf , I am able to plug it and remove it and does not affect anything at all.
I believe the car is running of the preset map .
I replaced the entire wiring harness with a 91 , still having the problem , I also try using the 91 maf , no success , also tried the 92 maf , same issue .
I changed the ecm to a 91 and a 92 , still having the same issue .
What could be the problem ? do I need to use a 96 maf since the motor is a 96 to begin with ?
I also did change the lower intake manifold of the car to a 92 unit .

Someone please help , any sugestion is welcome at this point, I am willing to try anything.
 

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check the ground on the maf if there's no problem then try a 96 maf with a 96 ecu if it is showing the same activity then replace the the ecu or get a piggy back unit and use it to run diognostics an if the same ur cars cursed and theres nothing u can do!
 
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