On the Friday prior to our first scheduled weekend flight with our new control system, while checking out the aircraft, we found the right ignition / fuel injection module was not working properly. It took the rest of the day to confirm that all the sensors were working, but too late to find out that the circuit board section of the module that distributed power to the right bank of fuel injectors had failed. Therefore, we had no chance to get a replacement for the weekend.

During conversations with the manufacturer, we found out that they had failed to notify us that when replacing the high resistance fuel injectors with low resistance injectors an external relay is needed to power the injectors. Without the external relay, too high of a current was being generated across the circuit board that feeds power to the fuel injectors; i.e. damaging it and causing no power to be delivered to the fuel injectors. Our fix was to route an alternate power source to both left & right banks of fuel injectors, but allowing the left & right modules to keep control of the injector's pulsing action. This change was done to keep the same thing from occurring to the left module and in such a manner that both banks of fuel injectors will receive power even if one of the modules lost power. This design further increased our safety net.

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