Diagnostic system and method to temporarily adjust fuel quantity delivered to a fuel injected engine

A diagnostic machine to modify fuel flow in a fuel injected engine of an outboard motor, comprising:

• a communication interface connectable to an ECU of an outboard motor having a fuel injected engine;
• a processor connected to the communication interface capable of receiving fuel injector data from the ECU and transmitting an adjustment value to the ECU;
• a computer readable storage medium having thereon a computer program that when executed by the processor causes the processor to determine the adjustment value, wherein the adjustment value is indicative of a change in fuel injector firing time of at least one identified fuel injector;
• and
• wherein the computer program when executed causes the processor to receive fuel injector coefficients from the ECU and create a modified pulse width to modify fuel flow to at least one cylinder and the fuel flow to the at least one cylinder is defined by a third-order polynomial.

A method to adjust fuel quantity delivered to a fuel injected engine comprising the steps of:

• (A) connecting a diagnostic machine to an ECU of a fuel injected engine;
• (B) selecting at least one injector having an injector pulse width associated therewith;
• (C) modifying the injector pulse width based upon at least one user input;
• (D) transmitting the modified injector pulse width of the at least one injector to the ECU of the fuel injected engine;
• and
• wherein the at least one injector has a fuel flow defined by a third-order polynomial.

A method to adjust fuel quantity delivered to a fuel injected engine of an outboard motor comprising the steps of:

• receiving operating parameters of a fuel injected engine;
• determining fuel flow based on the operating parameters of the fuel injected engine;
• modifying the fuel flow of at least one injector to temporarily adjust the fuel quantity delivered to the fuel injected engine;
• wherein the step of modifying the fuel flow includes the step of adjusting a pulse width for the at least one injector and applying the adjusted pulse width to the fuel;
• and
• changing at least one term of a third-order polynomial.

A system to adjust fuel injector data of a fuel injected engine incorporated in an outboard motor comprising:

• means for communicating with an ECU of a fuel injected engine;
• means for identifying and selecting at least one engine cylinder having an injector pulse width associated therewith;
• means for receiving at least one user input;
• means for modifying the injector pulse width by changing at least one term of a third-order polynomial;
• and
• means for communicating the modified injector pulse width to the ECU of the fuel injected engine.

A method to adjust fuel quantity delivered to a fuel injected engine comprising the steps of:

• connecting a diagnostic machine to an ECU of a fuel injected engine;
• selecting at least one injector having an injector pulse width associated therewith;
• modifying the injector pulse width based upon at least one user input;
• and
• transmitting the modified injector pulse width of the at least one injector to the ECU of the fuel injected engine, wherein the at least one injector has a fuel flow defined by a third-order polynomial.