Fast XFI problem

[Robin Lawrence]

Originally Posted by herbjr

We have a fast XFI 2.0 fuel injection set up on a 550 hp engine it doesn’t matter how you set the map or any of the curves in the program after running about four seconds the fuel injection go stupid rich. It doesn’t matter where you set it Up it just goes crazy Rich to the point it blows Blacksmoke out has anybody had this problem and if so what did you do to fix it thank you for your replies

Look at your grounds. The injectors are triggered on their ground side. Any poor grounds can pull on the signal and cause the injectors to run open a lot longer than they should.

Robin

[Greenlight]

You may have accidentally "enabled" one of the various power adder features.

Go to "view", "power adder global parameters", and disable "PA mode enable" and select "PA fuel tables off".

[denbreeden]

Make sure your MAP setting is 1 bar. If it is set on 2 or higher it will flood the motor with fuel.

[Angelo DiTocco]

do any of the numbers in the fuel map change? or in the timing map?

[Signman]

Make sure the changes you are making are actually being saved to the ECU. Disconnect then reconnect and check tables edited.



Swap USB cable and serial to usb adapter. I chased my tail for most of a season because my usb cable was bad.


Change O2 sensor to new or known good sensor. If you are running closed loop which is a good idea when the map is out to lunch or data logging open loop the values will be off.