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Just read the link Frank posted. I thought about this idea one time, but didn't have a good answer for the O2 sensor problem--looks like you figured it out, using a Wideband O2 sensor and skewing the value as needed to provide a typical O2 sensor output the ECU will understand. Very cool.
I'd love to see some real numbers behind this. I bet adding a port-by-port Water Injection system would substantially improve the workability of the offline cylinders (from steam vaporization). The use of microprocessor is good too, I was dreaming about using an Arduino (8-bit, can have similar # of digital I/O ports if you use the ATmega2560) due to the open-source community surrounding it.
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