So I have a fresh b20v swap in my EM1. Runs okay, starts right up. Just running too rich. It only sputters on WOT. If you don't push it to the floor, it'll rev up like its supposed to.
Took out the spark plugs, all plugs from cylinder #1-4 are black. (Brand new NGK Sparkplugs)
I cleaned them out with sandpaper and threw them back in the car then let the car run for a minute. Right when I took out #1plug, it looked black as before.
Could it be my O2 sensor??
I have DC headers so I don't have the primary O2 sensor, just the secondary O2 on the cat.
The only codes I have are:
P0108 Manifold Absolute Pressure/BARO Sensor High Input
P0122 Throttle/Pedal Position Sensor A Circuit Low Input
P1337 CKP (CKF) Sensor No Signal <------Running b20v in a stock 00 civic SI harness (OBD2) I can bypass it if I put my OBD1 Jumper and run a stock PR3 ECU
O2 Sensor Code <---Don't remember what the code was (Car is in paint booth)

 

fix codes.

 

Check that the plugs for the MAP and TPS are not swapped. The plug where one of the wires is solid white goes on the MAP. Good idea to check all the sensor plugs by wire color as well. Check that the TPS voltage increases as throttle is opened. Some swaps require reversing the two outside wires.

The system needs a primary O2 sensor. Modify the header so there is a place to mount one.