I have added heated o2 sensors to many cars. I have seen a huge improvement. I have added them to GM CCC carb cars (305, 350, & the best 307). The 307 mid 80's car really get a huge fuel economy pick up. I have done several in TBI trucks also. I have seen the biggest fuel economy pick up ever in a 94 454 big block Suburban. They go into closed loop so much quicker and stay in closed loop. The heater aids in keeping them clean. Clean will have a much more acurate reading. I install a relay on the heater power circuit just like the OEM.
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04:19 PM
Blacktree Member
Posts: 20770 From: Central Florida Registered: Dec 2001
Would you be willing to provide some details (like which brand/model to use, how to wire it up)? I'd like to install a heated O2 sensor on my 2.8 V6. Thanks.
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07:59 PM
Blacktree Member
Posts: 20770 From: Central Florida Registered: Dec 2001
I found a heated O2 sensor retrofit kit at Thunder Racing (scroll down the page a bit).
So now, I'm left with 2 questions:
1) How much power does the heating element use? I want to install an in-line fuse, to protect against short circuit. 2) Do all O2 sensors use the same size fitting? I'm referring to the threaded fitting where it screws into the exhaust pipe.
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09:03 PM
Xanth Member
Posts: 6886 From: Massachusetts Registered: May 2006
I'm just curious, would a heated O2 sensor provide any benefit over the stock when using a stock ECM and engine? I thought the stock ECM was a fairly slow creature, what would it do with a better O2?
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[This message has been edited by Xanth (edited 11-18-2007).]
ok so heres what i am trying to do ... Get better mpg in town... 180 to a tank is killing my wallet. i have heard in the past that if you have no cat ther isnt enough heat for the o2 to function properly...
thanks for posting this Blacktree its what i am trying to find out but did not know how to put into words.
quote
Originally posted by Blacktree:
I found a heated O2 sensor retrofit kit at Thunder Racing (scroll down the page a bit).
So now, I'm left with 2 questions:
1) How much power does the heating element use? I want to install an in-line fuse, to protect against short circuit. 2) Do all O2 sensors use the same size fitting? I'm referring to the threaded fitting where it screws into the exhaust pipe.
yep just like in the pic i need that harness... if there is someone out there that can make it for me theres 20.00 dollars plus shipping in it for them
The primary, pretty much only, reason to heat a standard O2 sensor (as opposed to a wideband version) is to get it up to operating temperature faster. Normal exhaust temperatures will be more than hot enough to keep a normal sensor at operation temperatures. The only way a sensor wouldn't be heated properly by the exhaust would be if it was located far, far away from the engine, but that kind of installation isn't useful anyway because of hysteresis issues.
You could always go with a wideband O2 sensor. Use the narrowband output to the ECM and the wideband output to a gauge. It is of the heated type. Mine goes into closed loop very quickly.
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09:44 AM
Steven Snyder Member
Posts: 3324 From: Los Angeles, CA Registered: Mar 2004
Cat isn't going to heat up the pre-cat exhaust unless it causes restriction. The O2 sensor should heat up even with an open downpipe. How old is your sensor? Have you been running rich for any extended period of time? You could have a fouled sensor.
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12:45 PM
aaronrus Member
Posts: 870 From: bradenton, FL USA Registered: Nov 2003
I found a heated O2 sensor retrofit kit at Thunder Racing (scroll down the page a bit).
So now, I'm left with 2 questions:
1) How much power does the heating element use? I want to install an in-line fuse, to protect against short circuit. 2) Do all O2 sensors use the same size fitting? I'm referring to the threaded fitting where it screws into the exhaust pipe.
Heated O2 sensors have 4 wires, simply grab one from a car that has one, like a 3800 series 2 engine or an N*. add a relay to control the o2 sensor, and an inline fuse, and you are good to go
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02:55 PM
Blacktree Member
Posts: 20770 From: Central Florida Registered: Dec 2001
ya i think a 10 would work but is there anyone out there that would make me a harness?
You can make that harness yourself. Its easy and they show it, right there on the website. Go to a salvage yard and find a car with a heated O2 sensor in it. Cut the connector with a much wire as you can get with the connector. Connect the two black wires together and that will go to ground. The pink will goto a switched 12 volt source and the purple is your sensing wire.
