I have LT headers and have read that a heated o2 sensor is recommended because otherwise the sensor may not reach the 600* necessary to acticate it. I have a stock ecm (730) TPI motor and want to install a heated o2 sensor. I have never seen any articles here on and installation, though I may have just missed one.

Anyone know what it takes? I have seen the sensors for sale, I think all the aftermarket fuel injection companies sell them.

I have seen them with 3 wires attached to the sensor. I think they are 1 power, 1 ground, and 1 signal wire.

Am I correct? If not does anyone know how to install one?

Thanks in advance.

 

Well one thing i know is that one wire is not for 12volts positive and the other is not for negative.
They are not an electronic device (typical). They are usually two different types of metal fused together and generate electric current according to the amount of oxgen on them, but the sensor
has to be above a certain temperature. If you check the specs of these things in your car manual you will see the computer does not read the oxygen sensor till its heated up. Thats why sometimes youu get false readings during tuneup and are toll to rev engine at eg 2000 rpm for a couple of minutes to heat sensor up.

 

I'm in the same boat as you 92zzz28! I have long-tubes and I myself am in need of a heated o2. Anyone have info on this ordeal?

Mike (1bad91Z)

 

Not difficult at all. Three wire sensors use a ground and a power for the heater and the last wire goes to the ecm as the o2 signal. The heater wires will be of the same color and can also be identified by using an ohm meter. The two wires should have around 10 ohms or so. The four wire ones use a redundant ground for the o2 sensor body just in case it doesn't ground at the threads of where it's mounted. Again, the two wires that are alike in color will most likely be the hetear wires (identified by the 10 ohms or so of resistance), the signal wire will most likely be white or purple and the extra ground will be gray and can be identified by checking it to the body of the o2 sensor and then just hooking it to ground. This may or may not help but check it out anyhow: https://www.thirdgen.org/techbb2/sho...hreadid=133156

 

Hectorsn

Thanks for the reply, very helpful.
Does the heater wire run off of 12v dc or a lower ecm sent voltage? And does the signal wire on a heated type 3-wire o2 sensor simply plug into the stock signal wire to the computer?
I imagine it depends on the manufacturer of o2 sensors. Do you have any suggestions about manufacturers to use of stay away from?

THanks in advance.

 

The 12v wire is just a key on power, the ecm doesn't have anything to do with it. The signal wire is in the 3 wire plug so you'll have to do something with the connection but yes, it is the only wire that will go to the ecm. Get a Delco sensor, I wouldn't mess with anything else.

 

Thank you for the information.

 

I just changed to a heated O2 sensor, yesterday. My sensor is located in the exhaust pipe. I have no cat and dual exhaust with no crossover. The change took an hour and the performance change was really noticeable. I cut off the three wire connector from the new O2, and the single connector from the old. Then soldered the old single connector to the odd color wire on the new O2. For the heater wires, I used crimp connectors to wire one to ground and the other to the ignition wire (12 coil wire). That way the heater turns on and off with the key. A digital voltmeter confirmed that I was now getting voltages above and below .45v.

John

 

350TBI747.
Where did you buy your heated 02 and do you have articlenumber of that one?