I have been working with hho for about 2 months. I have an extender on my o2 sensor. I have a gen. that is producing approx. 1 lpm. I have seen returns of about 4 to 5 mpg increase. I recently added a maf/map but am having trouble with the signal to the ECU. I have the wiring diagrams for the car. I have a 12 volt and ground imput into the maf sensor. I have a 5 volt wire that is supposed to be the signal. When I seriesed the maf/map with the signal wire the adjustment pots were adjusting the voltage to the maf and not the ECU. I swapped the wire leads but to the same results. Does anyone have any ideas?