2.5L ('98-'01) 2000 2.5 o2 sensor voltage

[felgar_1]

hi, i trying to find the voltage spec. on the o2 sensor as what the ecm sees. i bought a wideband o2 sensor and i am trying to see if i can wire it into the ecm

 

[scotts90ranger]

I doubt it, standard switching O2 sensors are a 0-1V signal where wideband sensors normally give out a 0-5V signal. A standard O2 sensor basically only knows if it is slightly rich or slightly lean and that's roughly all the computer is looking for (it's more complicated than that...). Even if you got it into the ECM, it wouldn't know what to do with it.

 

[felgar_1]

hi, thanks, when i start tuning the engine, i figure i would not have to get a data logger just for the wide band if the ecm runs it.

 

[scotts90ranger]

That would make sense, but I wouldn't get too caught up in AFR though, it is good to know but it's just part of the equation. Back in the day I'd hear you get the best power at 12.5:1 or whatever but that's not a set in stone rule... A stoich mixture (14.7:1) is a good place to be until the EGT's start getting high then you can advance the timing a little or add more fuel to cool it down but there's a point where it starts knocking some where you have to back off on the timing or you'll melt a piston...

I don't know enough about the ECM to know if there's an auxiliary input you can use to record over the OBD II, or something you could disable to have an open channel...

Not saying you don't know these things, just for anyone that happens to read it and I don't know everyone's background