Ford air meters are not calibrated for a certain size injector. For example, 1993 Mustang Cobra (24 # injector), 1991 T-Bird Super Coupe (30 # injector), 1992 T-Bird 3.8L (19 # injector) all use the same air meter. Injector size is programed into the calibration contained in the powertrain control module or PCM. The air meter's transfer function is also in the calibration. Aftermarket meters "adjust" the voltage sent to the PCM to trick it to work with a certain size injector.
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