Has anyone done a three wire heated O2 sensor conversion, and if so, what parts and labor are involved in such a conversion?

 

If you want a fully automatic heater circuit for your TPI (install some hedders, did we?) you can try this type circuit:

 

why can't you just go power - ground & sensor? why go to the ecm?

 

You can just wire the heater(s) directly to ignition power. This circuit will shut off the heaters once the ECM reaches closed loop (which it can only do if the O²s are hot and reporting) to save the heater elements. I'm not sure how much it would extend the life of the heaters, however.

 

Mar 06 Chevy High Performance magazine gives these AC Delco part #s to change to heated one;

25312179 for the three wire O2
12126012 for a 3 wire connector repair kit to connect it

 

Thanks for the schematic, and yes, I have hookers. (the headers ) My scanner was showing the O2 acting very sluggish and I figured it just wasn't quite getting hot enough. I'll give this a try, Thank you.