I did an engine swap in my 240 and now I'm having problems with my Mafs. I hooked up a nissan consult to my car and when I put the key in the "on" position the mafs reads 5V which is max voltage. When I start the car the sensor still reads 5V, and the car stumbles alot, but will still hold an idle. When I unplug the mafs the engine smooths out and holds a steady idle of about 1100 rpm. Which would lead me to believe that the mafs is bad, however I have taken a mafs off of a running 240sx and it does the same thing. I have tried grounding the mafs wire to the chassis and the idle gets worse. I have tried another used ecu too and the car acted the same way. The ecu only throws code 12 which is the mafs, and no other codes. I am stumped but am hoping someone could help me out.
-Tim
1992 240sx ka24de mass air flow problems
Re: 1992 240sx ka24de mass air flow problems (Tims_240)
Would a bad ground have something to do with the MAFS seeing 5 volts at all times?thanks guys-tim
-
DJButton
- Moderator
- Posts: 4493
- Joined: Tue Mar 22, 2005 6:38 pm
- Car: 2010 Nissan 240sx
- Location: New Hampshire, USA
Re: 1992 240sx ka24de mass air flow problems (Tims_240)
It sounds like it may be wired incorrectly, the symptoms you describe are synonomous with faulty wiring to the MAFS. What engine did you swap in, and which MAFS is it. That will help us better understand what you're dealing with.
Re: 1992 240sx ka24de mass air flow problems (DJButton)
I swapped in a 1993 motor, the convertable, and I have a s13 ecu and an s13 mafs. I still havent been able to get this car running...
