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Each injector has a connector with two wires. One of the wires is supplied with a constant 12 volts when the key is in the "run" position. While the engine is being cranked or running, the other wire is supplied with a pulsed negative ground from the pcm (powertrain control module - computer) to complete the circuit and therefore operate (pulse) the injector. The pcm references the cam sensor so it knows when to initiate the timing sequence for the injectors. In addition, the pcm uses info which it obtains from a number of sensors on the engine to then calculate the varying pulse width needed for correct engine operation under various driving conditions. Hope this helps! Walt

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Q: What provides injector pulse to a 3.0 1993 Ford Taurus?
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