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Most modern engines with OBD2 would pick up a significant difference in flow from one injector to another. It would show up as a difference in cylinder balance, which is measured passively by a sensor that measures the difference in acceleration and deceleration of the flywheel as the enigne is running.
The sensor counts the number of teeth in the flywheel ring gear, and provides a percentage of power developed between each cylinder as the engine is running.
regards
Mech
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