Do I need an EFIE or a MAP Enhancer? 99 Honda Civic
I have a 1999 Honda Civic DX (D16y7 engine 1.6L), multi-port fuel injection.
Do I need an EFIE to modify the voltage coming from the o2 sensors off the exhaust to the computer, or do I need to modify the voltage coming from the MAP sensor to the computer?
I am confused about when could effectively lean out the mixture to where it should be after installing an HHO system.