Automated electronic trim for a fuel injector

A method of trimming fuel injectors within a system, comprising a plurality of fuel injectors, comprising the steps of:

• injecting in a first mode wherein each injector of said plurality of injectors injects a first predetermined quantity of fuel;
• determining a first predetermined total quantity of fuel injected by said plurality of injectors;
• selecting one injector from said plurality of injectors and injecting in a second mode, wherein a specific second quantity of fuel is less than said specific first quantity of fuel;
• determining a second total quantity of fuel injected by said plurality of injectors in response to said selecting step;
• and
• determining a performance characteristic of said selected injector in response to said first and said second total quantities of fuel.

A system for trimming a fuel injector comprising:

• a plurality of fuel injectors;
• an engine performance sensor adapted to measure an engine performance characteristic;
• and
• a controller adapted to receive a signal from said engine performance sensor, send multiple injection signals to each of said plurality of fuel injectors, determine a first fuel quantity injected by said plurality of injectors, suspend at least one of said multiple injection signals to partially suspend fuel delivery of one of said plurality of injectors, adjust said first fuel quantity to a second fuel quantity in order to maintain said engine performance characteristic at a relatively constant level, determine said second fuel quantity injected by said plurality of injectors;
• compare said first and said second fuel quantities, and determine a performance characteristic of said partially suspended injector.