anyone know how to wire in a 3 wire 02 sensor

[markmitchinnh]

I have an 89 astro and wish to switch the single wire 02 to a 3 wire 02 sensor. ANyone know how?

[astroturf]

Why?

Why not use the original replacement part?

[markmitchinnh]

A three wire 02 sensor works faster and gives you better fuel to air ratio therefore saves gas and gives better take off when cold.

[doyoulikeithere]

Yes, The other two wires are for the heater in it that helps it work if the sensor is cold , or far from the cylinder head and exhaust gasses cooler.
In 89, as in 87 like mine, the oxy sensor is very close to the left exhaust manifold and has a single purple wire.
I now have a 95 frame, engine and exhaust manifold, and my oxy sensor is located way back on the ypipe, by the catalytic converter, and is a 3 wire unit.
This same job is on my to do list for this spring. I ran it with the 1 wire and it worked, but not well, and I got an oxy code sometimes.
The schematic just shows the one wire for the sensor and the other 2 wires for the heat element. They just need power when the key is on to heat the element..
I'm in the midst of changing engines these days, and I gotta do the wires to the O2 sensor as well..

[markmitchinnh]

So basically when I swap over to the V8 I can add a hot from ignition and a ground to wire in the 3 wire 02? is this correct? My new exhaust is headers into 2.5 then to a dual 2.5 Y pipe out to to a 3 inch ( previously used for a cat con) back into another Y pipe same size but reversed out to dual tail pipes then to 2 mufflers in the back (like a corvette) The mufflers are dynomax super turbo's fully welded. 2.5 in and out. I will take pictures when I am installing the V8.
The two Y pipes put together basically will work in the same sense as an X-pipe which theoretically gives you more low end torque. The 02 sensor is located in the beginning of the first Y pipe. I am open to anyone's thoughts on this exhaust system as I have not put it together yet.

[doyoulikeithere]

That should sound nice!
The O2 - Yup, The xtra 2 wires in the 3 wire sensor are just a heater element.

[1Gary]

Setting back in the cheap seats absorbing. Keep the info and pic's coming Mark. =D>