lt1camaroman93

Does anyone have a diagram that i can look at to see how to wire up 3wire heated o2's. I need to switch from sigle wires for my long tube + big cam. big cam + cold o2's = runs so rich kills car, but when o2's warm up... runs reall good.

AlexA

The car won't go into closed loop until the O2s are warm (timed), but I guess you are saying they aren't warmed up and the car goes to closed loop anyway?

With a BIG cam, I'd probably just tune it with a "WOT" idle anyway. As for the wiring of a 3-wire O2, I'd imagine it's the one wire to the PCM and switched power to the other 2 leads. An obvious thing to say, I guess.

-Alex

lt1camaroman93

It might be an obvious thing to people that even have a remote idea how they work, and i don't so that is why i asked. Here is my thinking on the o2 thing. I have an A/F guage, and it does not move until the o2's are warm enough to send a signal. The guage does not move until i have been driving around at 2500rpm plus. When the guage is moving the car runs perfect, idle's perfect and everything. If i stop at a light. As i sit there the guage slows down and stops again and the car dies out. So what i am thinking is that the o2's arent' staying warm enough to send the signal the the pcm, and then goes into its preset settings, and not working off the o2's. i think that the huge lack of vacuum from the cam is making the computer go nuts when the o2's aren't sending a signal. Like i said.. i do not understand this fully and this is why i am asking. i need to learn