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What car and engine? I don't believe it ever goes to 100% duty cycle. The duty cycle decision gets inputs, I believe, from the HEP signal (RPM), MAP, TPS and O2 sensor.
 

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100% duty cycle means that the injector is spraying continuously, it never shuts off, even for an instant. I can't imagine that that should happen for longer than a fraction of an instant. It would flood the engine.
 
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