Car running very rich (not mine, but help anyway)

[Jeff240sx]

Hey.
My gf's brother has an NX2000.
Anyway, it is running way too rich, and spitting unburnt liquid gas from the exhaust pipe.
We removed the injector rail and the injectors are spitting fine. The ignition is perfect, new fuel pump, filter, ect.
No trouble codes from the ECU.
Anyone have a clue?
-Jeff

[mrdirty]

sure the plugs are firing? Did u take one out and fire it?

[Thurazor]

Check the O2 sensors.

[Foxcolt]

Check voltage on throttle postition sensor. I had a running rich problem a while back and traced it to that.

[d240t2]

Does it run like it is on 3 cylinders? What happens if you disconnect the fuel injector pigtails one at a time? Can you narrow it down to a specific cylinder? Are you sure the plugs are firing? Are you sure that is raw fuel coming out of the exhaust?

What is the MAFS voltage at idle? Is this problem consistent, or intermittent? Did you check the TPS voltage at idle and WOT?

Dennis

[wherezmytofu]

1. check o2 sensors
2. if the check engine light is on, not matainance, the car goes in dump gas mod