I built my efie after mad scientists utube design which is just like DMBing`s design also. When I seen DMBing`s video I noticed he put his ground to his sensor, which was unplugged, then his output to the ecu. This gives the ecu a CONSTANT signal , not a fluctuating, realtime signal. It doesnt seem that he`s ADDING to the signal, just throwing a fixed voltage at the ecu.
My Sable 3.8 wagon did not like this at all.... after 5 miles it gave me a check engine light. So this morning I put it back the way I had it ... which was a single wire to my o2 senor from the enhancer, then ground the ground wire and keep the sensor plugged and operating. this config only allows me to add .35 volts cranked all the way up. ( dont know why) but it works.
I`m using a 1.5vlt battery but would like to tap into the cars 12 vlt supply .
But I dont know how to step it down (resistor?) ... If anyone knows how to do this , I would be gratefull , thanx Attachment 854