hey guys i have a check engine light code #43 fuel supplysystem
i have a b16 swap, gsr ecu,with cams, intake manifold, a big bore throttlebodie, full exhaust and no cat.
i did a compression check (150psi all 4)and the plugs are pretty black but not wet.
i beleve code 43 would refer to a oxygen sensor problem but the car runs like **** all the time. so i am reluctant to just change the sensor.
any ideas
the check engine light comes on when i floor it

thanks

 

bump
no one has any insight on this?

 

Which GSR ECU? Match to the engine? Fuelmaps for a B18C1 would cause slightly incorrect mixture in a B16 (for example). Then the O2 sensor feedback would correct the mixture, but the ECU should report that as an inconsistency that it didn't understand.