Hi friends. I am installing a header in my car, an old 4-1 RK Sport one, with a relocated O2 bung in the collector and with a Caspers Electronics's O2 heated sensor kit. I bought this kit to avoid MILs and get better O2 readings because the new O2 location in the collector is almost a feet far from the original location.
The issue is that my OEM O2 sensor have 2-wires!!!!! instead on 1-wire as I thought should be the common case. It have a black wire that should be the earth or negative and a pink one, that I am sure that should the O2 signal. Please check me about this?
I need to know if exist enough wire to extend the connection, but a feet is too far I think, right? In the case that I can reach the bung what should I do?
1.- How can I connect the Heated O2 sensor kit? The kit comes out the main connector with 3 wires, a red one (positive of the heated system or resistance), a black one (is it the sensor earth or heated system earth?) and the pink one that is the O2 signal. My confusion is about the black one, is it the O2 signal earth or the earth of the heat system?. Personally I would like to connect it without splice or cut any car because the O2 system is very sensitive this kind of things.
2.- And my last option, cut and splice the original wires to reach the new location? This would be my last option. I don't like it.
Ok I appreciate your advice, tips, suggestions, comments about this issue, ASAP if you can.
Thanks in advance.
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Shifted wrote:The black wire in the stock harness is power, not ground. It grounds to the exhaust system.
Hi Ron. Friend I check the wires and the black one doesn't have power. In fact after check for some info in the net I found that is a particular type of 2-wire O2 sensor used in 00-002 Cavalier, Grand-Am and Sunfires. The OEM O2 is not a heated one, I think. For example check out this
replacement from Bosch. I think that black wire is a floating earth or negative of O2 sensor that goes to the ECU. The pink one is the signal. I will like to check this.
Thanks,
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Hi friends here some pics of the sensor and the harness
Thanks,
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They are both signal wires for the pcm. Ones high and the others low. I believe the black one is the high signal which is comparative to the purple wire on a single wire O2. To check use a mulitmeter and see which wire bounces from 0-1 volts, the other wire won't go past 0.4 Volts.
That is what I have thinking. In fact according to info that I have found, the black wire is O2 Signal or (+) and Grey wire is the sensor ground or (-). Ok now the question is where can I find a conversion harness from a 4-wire sensor to a 2-wire sensor? or where can I find both type of connectors (a 4-wire and a 2-wire one) to modify my Caspers's O2 heated kit. Caspers doesn't have a harness kit for 2-wires sensor in their online store, but I am still waiting for their answers.
Any idea where can I find this connectors?
Thanks,
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I have been looking in the net without luck. Any help would be highly appreciated.
Thanks,
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I found that this
place sells connectors and wires (pigtails) for my appl. But I find the female only, not the male.
This is making me nuts. Anyway patience.
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i had the same problem for my 4-1 pacesetter header.....just grab where the plug is in the harness and take it out of the swirly stuff (wire mold) and just pull it out of there untill it extends far enough to hook in i just put a new ac delco one in and had the same prob but i did that and it hooked up fine
The grey wire is not a ground it is another signal wire. If you use a multimeter you will find it produces voltage (0.4 volts). You cannot use that heated O2 kit, or convert your existing harness. Just use the stock O2 you will be fine. I have the pacesetter header (same as RK's) and I'm in closed loop in less than 60 seconds.
The reason you see 0.4v and not 0 is because, the grey wire is a floating ground, different from the car's ground. You always can find some kind of small voltage at this wire to the car's ground. The ECU reads the differential voltage between the wires, this way it gets better and precise readings. Well I think.
Regards,
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