Heated O2 sensor
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 2,238
Likes: 4
From: Milan
Heated O2 sensor
Installed Hooker LT header. I have a '90.
I used (for now) the stock O2 sensor in the stock location of the #7 collector in the new headers.
It goes in closed loop, and it stays in closed loop even at idle, but I'm having feedback only from ONE cilinder about O2 mvolts.
I know I need an Heated O2 sensor located where the 4 collectors meets in the single big pipe...
Which one? the 3 wire?, the 4 wire, what's the difference?
Someone said me to stay away from Bosh sensors..
Thanks for your input.
-Beppe-
I used (for now) the stock O2 sensor in the stock location of the #7 collector in the new headers.
It goes in closed loop, and it stays in closed loop even at idle, but I'm having feedback only from ONE cilinder about O2 mvolts.
I know I need an Heated O2 sensor located where the 4 collectors meets in the single big pipe...
Which one? the 3 wire?, the 4 wire, what's the difference?
Someone said me to stay away from Bosh sensors..
Thanks for your input.
-Beppe-
Race Director
Joined: May 2001
Posts: 14,165
Likes: 9
Yeah a heated sensor in the collector would give you much better data.
For cars that originally came with one wire sensors the only option you really have is to go with the 3 wires sensors. The 4th wire on the 4 wire sensors apparently goes back to the ECM, so the earlier computers just don't have a provision for it.
I used genuine AC Delco sensors, which I'm here to tell you just LOOK like a lot better quality than the BOSCH sensors they replaced.
You can get the sensor and a wiring harness adapter which allows you to still have a plug in sensor should you ever need to replace it again
Sensors are part number 12126012
Connectors are part number 25312179
For cars that originally came with one wire sensors the only option you really have is to go with the 3 wires sensors. The 4th wire on the 4 wire sensors apparently goes back to the ECM, so the earlier computers just don't have a provision for it.
I used genuine AC Delco sensors, which I'm here to tell you just LOOK like a lot better quality than the BOSCH sensors they replaced.
You can get the sensor and a wiring harness adapter which allows you to still have a plug in sensor should you ever need to replace it again
Sensors are part number 12126012
Connectors are part number 25312179
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 2,238
Likes: 4
From: Milan
Originally Posted by Nathan Plemons
Yeah a heated sensor in the collector would give you much better data.
For cars that originally came with one wire sensors the only option you really have is to go with the 3 wires sensors. The 4th wire on the 4 wire sensors apparently goes back to the ECM, so the earlier computers just don't have a provision for it.
I used genuine AC Delco sensors, which I'm here to tell you just LOOK like a lot better quality than the BOSCH sensors they replaced.
You can get the sensor and a wiring harness adapter which allows you to still have a plug in sensor should you ever need to replace it again
Sensors are part number 12126012
Connectors are part number 25312179
For cars that originally came with one wire sensors the only option you really have is to go with the 3 wires sensors. The 4th wire on the 4 wire sensors apparently goes back to the ECM, so the earlier computers just don't have a provision for it.
I used genuine AC Delco sensors, which I'm here to tell you just LOOK like a lot better quality than the BOSCH sensors they replaced.
You can get the sensor and a wiring harness adapter which allows you to still have a plug in sensor should you ever need to replace it again
Sensors are part number 12126012
Connectors are part number 25312179
Is it possible to do an hole and welding a bung with headers on?
If I have to tear down the headers I will let the single wire O2 sensor!
Someone with a pic to locate the best location to put it?
Race Director
Joined: May 2001
Posts: 14,165
Likes: 9
It's probably possible. Let me give you a very big word of warning though. My 92 has a magnesium bellhousing. I don't know if your 90 does or not. If it does you want whoever is doing the welding to be extremely careful to not get anywhere near the bellhousing with that torch.
Magnesium is a funny metal in that it burns, and once it's ignited there is just a whole lot of nothing you can do to actually put it out!
Magnesium is a funny metal in that it burns, and once it's ignited there is just a whole lot of nothing you can do to actually put it out!
Le Mans Master
Joined: Jan 2002
Posts: 5,556
Likes: 0
From: Jenison MI
Cruise-In VI Veteran
Cruise-In VII Veteran
St. Jude Donor '06
Originally Posted by Nathan Plemons
Sensors are part number 12126012
Connectors are part number 25312179
Racer
Joined: May 2001
Posts: 472
Likes: 0
From: Tampa Bay Area
I went to GMPartsdirect.com and actually the numbers are backwards its:
Sensors are part number 25312179
Connectors are part number 12126012
I just didn't want anyone to get confused.
BTW, thanks for the tip Nathan I will be getting a heated 02 sensor for mine.
thanks,
Josh
Sensors are part number 25312179
Connectors are part number 12126012
I just didn't want anyone to get confused.
BTW, thanks for the tip Nathan I will be getting a heated 02 sensor for mine.
thanks,
Josh
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