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#1 |
Registered User
Join Date: Jul 2001
Location: North Louisiana
Posts: 4,501
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Switching from a 3 wire to a 4 wire(heated) O2 sensor
I recently converted my '85 GMC to TBI and installed headers. It runs terrible in cool weather, and the original oxygen sensor is mounted in the bottom of the header. I've been told that it needs a 4 wire heated sensor, but I don't know what to ask for. Is there a kit to do this, or will any 4 wire sensor work? I also need to know how to wire it. Has anyone done this before?
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Wynne 70 CST short fleet Hugger orange & white, 350/350, ps, pb, air, tilt, tach/vac/speedwarning, original buckets, AM/FM, oak bed floor, shoulder belts, 3.5"/5.5" drop, 20" American Racing VN425s. Build thread 53 Chevy shortbed 69 Camaro Click here to subscribe Chevy GMC International Truck Club Louisiana Charter Member http://www.louisianaclassictruckclub.com |
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#2 |
Registered User
Join Date: Oct 2005
Location: lakewood
Posts: 79
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Re: Switching from a 3 wire to a 4 wire(heated) O2 sensor
I was under the impression that 4 wire heated o2 sensors were used in obdII cars/trucks to monitor the Cat converter, and was placed after the cat?
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g35s (areo,premium,navi) 67' fleetside Last edited by G35MIKE; 11-18-2007 at 12:00 PM. |
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#3 |
On a budget like Fred Sanford
Join Date: Oct 2005
Location: Topeka, KS
Posts: 2,031
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Re: Switching from a 3 wire to a 4 wire(heated) O2 sensor
They are also used pre-cat to control fueling.
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'85 Silverado swb: 383 stroker, 10.5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4.11 383ci build / exterior refresh thread '98 Camaro z28: 370ci twin turbo 370ci build '01 Tahoe LT 4x4: 5.3, longtubes/ory, magnaflow duals, custom tune....wife's DD |
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#4 |
Registered User
Join Date: Sep 2004
Location: Elizabeth, Colorado
Posts: 20
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Re: Switching from a 3 wire to a 4 wire(heated) O2 sensor
I did it to my 84 454 when I TBI's it. However I think I went to a 3 wire from a 2 wire. Used a GM Part number 25312185.
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