Installing Air/Fuel Gauge with stock O2 sensor still there?
07-25-02, 06:20 PM
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Installing Air/Fuel Gauge with stock O2 sensor still there?
Okay, I've got the two O2 sensors in my exhaust now right after the turbo. However, the stock O2 sensor only has one wire coming out of it. The instructions are expecting like two or something wires coming out of the stock one. Has anyone done an install on an Air/Fuel gauge? Can you help me out here with this? I've got it already installed, just need to wire the sucker up correctly.
07-25-02, 06:27 PM
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well i got my connected easy only 3 cables, one is ignition i think is red ,next is black ground , last is purple which it goes to the O2 cable that is coming out (O2 only have 1 cable coming out ,if i am right)
07-25-02, 06:29 PM
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Why two O2 sensors?
If you're connecting an A/F using the stock O2 sensor, don't make connections at the sensor itself, as this ofter causes problems. Make the connections at the ECU. The gauge will need power, earth and signal, all of which are easily found at the ECU.
If you're connecting an A/F using the stock O2 sensor, don't make connections at the sensor itself, as this ofter causes problems. Make the connections at the ECU. The gauge will need power, earth and signal, all of which are easily found at the ECU.
07-25-02, 06:51 PM
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no, I have the O2 sensor that goes with the air/fuel gauge.
Do I just leave the stock O2 sensor alone, and wire the Air/Fuel gauge on its own? Or do I tie them in together? Or what?
Do I just leave the stock O2 sensor alone, and wire the Air/Fuel gauge on its own? Or do I tie them in together? Or what?
07-25-02, 06:58 PM
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Boy, someone just bent you over and sold you something you didn't need...the extra O2 sensor.
The AFR gauge can easily "tap" into the stock O2 sensor wiring without screwing anything up.  The extra O2 sensor is a waste of money.
-Ted
The AFR gauge can easily "tap" into the stock O2 sensor wiring without screwing anything up.  The extra O2 sensor is a waste of money.
-Ted
07-25-02, 07:05 PM
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Originally posted by RETed
The AFR gauge can easily "tap" into the stock O2 sensor wiring without screwing anything up.
The AFR gauge can easily "tap" into the stock O2 sensor wiring without screwing anything up.
07-25-02, 09:07 PM
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I'm sure Ted meant tap into the wire at the ECU ... you would have to be a moron to actully wire it at the sensor itself.. pain in the *** and too damn hot on the wire.
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07-25-02, 09:14 PM
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well whoever the moron is that had the car before me already cut the wire, and all that I've got left on my wiring harness is a red wire that sticks out of the harness, and another piece of red wire spliced onto the O2 sensor wire.
Can I just take the friggin' aftermarket (4 wire) O2 sensor and wire it onto that red wire for the signal to both the ECU and the Air/Fuel gauge, ground it somewhere else, and what do I do with the other 2 wires?
Can I just take the friggin' aftermarket (4 wire) O2 sensor and wire it onto that red wire for the signal to both the ECU and the Air/Fuel gauge, ground it somewhere else, and what do I do with the other 2 wires?
07-25-02, 11:36 PM
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The 4 wires are most likely .... 12Volt, Ground, O2 sensor, and the last one is prolly for data logging, don't worry bout the data logging wire unless you have a good after market EMS.
I would hook the O2 sensor back up the way it was. and splice into your power, ground and O2 at the ECU.. its cleaner, less wire to run & will work perfect you can get all three of your connections in one place.
I would hook the O2 sensor back up the way it was. and splice into your power, ground and O2 at the ECU.. its cleaner, less wire to run & will work perfect you can get all three of your connections in one place.
07-25-02, 11:50 PM
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Yeah but I think the stock O2 sensor ISN'T grounded correctly now, now that whoever had the car before me spliced the wire wrong, and the ground sheathing isn't there anymore. Will an aftermarket O2 sensor (the one that I got with the A/F gauge) work on the RX-7? And if so, there's just one wire that I'll end up using for it for the signal, that'll get spliced to both the A/F gauge AND the ECU, correct? And then ground will go to ground, and power to power, and the 4th wire from the O2 sensor can just dangle in the breeze
07-26-02, 01:06 AM
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Originally posted by Barwick
well whoever the moron is that had the car before me already cut the wire, and all that I've got left on my wiring harness is a red wire that sticks out of the harness, and another piece of red wire spliced onto the O2 sensor wire.
Can I just take the friggin' aftermarket (4 wire) O2 sensor and wire it onto that red wire for the signal to both the ECU and the Air/Fuel gauge, ground it somewhere else, and what do I do with the other 2 wires?
well whoever the moron is that had the car before me already cut the wire, and all that I've got left on my wiring harness is a red wire that sticks out of the harness, and another piece of red wire spliced onto the O2 sensor wire.
Can I just take the friggin' aftermarket (4 wire) O2 sensor and wire it onto that red wire for the signal to both the ECU and the Air/Fuel gauge, ground it somewhere else, and what do I do with the other 2 wires?
07-26-02, 08:11 AM
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Did they give you a diagram with the new 02 sensor? And, sorry, but is there anything left of the wire on the original 02 sensor? Anyway I'd chunk the old sensor and put in the new one. They had to supply instructions on which wire is which on that sensor.
07-26-02, 09:06 AM
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Ok it sez...
Balck wire from O2 sensor goes to gray wire on air/fuel gauge
Gray wire from O2 sensor is grounded to the engine block
Power (+12v from ignition on) goes to one of the white wires, the other white wire will be grounded to the engine block.
So I'm guessing it doesn't matter WHICH white wire I power. The gray wire on the O2 sensor looks like the ground, and the black one looks like the signal. Should I Just tap into the black one for my signal for the ORIGINAL O2 sensor?
Balck wire from O2 sensor goes to gray wire on air/fuel gauge
Gray wire from O2 sensor is grounded to the engine block
Power (+12v from ignition on) goes to one of the white wires, the other white wire will be grounded to the engine block.
So I'm guessing it doesn't matter WHICH white wire I power. The gray wire on the O2 sensor looks like the ground, and the black one looks like the signal. Should I Just tap into the black one for my signal for the ORIGINAL O2 sensor?
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