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I m about to do a mass air conversion. I have the A9L computer, the engine wiring harness, A mass air meter from a 96 along with the Y pipe and air box. My questions are..... Instead of running a second O2 sensor can I wire both into the same O2 that I have now or do I really need to add a second and where should it go.... I have the engine harness that mounts to the square block on my driverside inner fender by the engine fuses. Do I need to wire anything else from that point to my computer or does that small harness from there to my computer have all the right wires. Oh I am doing this in my 93 f350 5.8 L 5 speed.
I have never done the conversion you are contemplating. There is a thread on this board though, where there is a guy who is trying to run a heavily modified 5.8 engine, and he also is having to convert to mass air, and is also messing around with the O2 sensors. I didn't read it all the way through, but you may be able to make it through since it is right down the line of what you are doing. It's a very very long thread. Here it is.
I read in there during the O2 debate that it may be possible to combine the two conputer inputs into one O2 sensor, but it was said it would work better it there was two sensors. I would have to agree that if it's hooked up like the designers intended, that it would work better.