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Old 07-31-2008, 09:13 AM
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2004 Xterra
 
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When you press the throttle pedal, the throttle plates open and that lets air rush into the engine. The amount of air going into the engine is measured by the MAF. The MAF sends that information to the ECM and depending of the amount of air going into the engine (an other inputs, like engine temperature, speed.. etc) the ECM decides how much fuel is send to the engine. The ECM controls the time amount of fuel by lengthen or shorten the injectors opening time.

I hope that helps.
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