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Old 03-16-2007, 09:20 PM   #21
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I don't think that's the correct solution.
Maybe he'll end up getting a near-stoich idle afr, but if there is an issue with vortec or o2 system, the car won't cruise well, even if your method fixes the idle mix.

thats why i said a final fix....that's how im running 305cc injectors with the oem AFM. all it does is adjust the idle air mixture, regular cruising and driving it acts as it should.
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Old 03-16-2007, 09:54 PM   #22
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Alright I just probed my stock oxygen sensor wire and i got -00.7 on the 200m Vdc setting on my digital multimeter. Only small fluctuations from -00.6 to -00.8
Is that good?

Now that I have the wideband where do I put the stock one wire oxygen sensor pick-up? Do I have to spice it into the wideband or can I leave it hang?

I will take the vortech out later and try that thing. Thanks for all the help.
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Old 03-16-2007, 09:56 PM   #23
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No, that sucks. Where did you probe the wire? At the ecu, or at the connector between the firewall and motor? Your car's running rich, so if it were reporting correctly, you would have shown .8 or .9 Volts.

I don't think you'll need to touch the vortec. Looks like your problem is a failed NB o2 sensor, or perhaps a failure in the wiring between the sensor and where you probed it. A new generic Bosch sensor is only $18.
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Old 03-17-2007, 03:41 AM   #24
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What do you mean NB sensor? I just put in a WB.

I got the reading off of the wire runing from the motor to where it used to connect to the one wire oxygen sensor and now it is just hanging there. What should I do with it?

Should I splice it into the 4 wire WB sensor???
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Old 03-17-2007, 07:59 AM   #25
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If you disconnected the NB("wire just hanging there") and didn't make provisions to feed an NB signal to the ECU from the WBO2, your ECU has probably defaulted to "safe" mode and makes the car run very rich.
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Old 03-17-2007, 03:52 PM   #26
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Alrighty then...So I got a AEM WB and it has 5 wires coming from the 02 sensor.

-Blk, white, red, yellowish, and purple.

Which one is my best bet?
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Old 03-17-2007, 05:32 PM   #27
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It came without directions?
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Old 03-17-2007, 07:14 PM   #28
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The AEM only has a 0-5V signal as far as I know. You need to have the narrowband stock sensor still in the circuit to the ecu. I asked the question right before I bought the AEM.
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Old 03-17-2007, 07:21 PM   #29
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So, you just pulled the NB sensor out, and replaced it with your new WB sensor? Then failed to connect anything to your ECU? Yeah, no **** you're running rich. There's no way to enter closed loop without o2 sensor feedback. The ECU uses this feedback to trim fuel delivery. Did your CEL come on?

You need to sim NB to the ECU with your WB, or you need to replace the NB sensor and put the WB sensor in its own bung. I'd go with the latter, which will move the expensive WB sensor further from the extreme heat of the turbo.

If you are going to run the WB sensor only, you need to have your WB controller simulate NB. This is not the same thing as just grabbing one of the wires at the WB o2 harness.
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Old 03-17-2007, 07:22 PM   #30
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Youll have to weld in a o2 sensor hole for the NB sensor...
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Old 03-17-2007, 09:35 PM   #31
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Alright I know that NB to the ECU wire has to go somewhere but that makes no sence to have to weld in an extra O2 bung!



Who else is running an AEM wideband???
Where does the NB sensor plug in to???
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Old 03-17-2007, 10:05 PM   #32
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Quote:
Originally Posted by Snowsurfer03 View Post
Alright I know that NB to the ECU wire has to go somewhere but that makes no sence to have to weld in an extra O2 bung!



Who else is running an AEM wideband???
Where does the NB sensor plug in to???
I have an AEM wideband and my car doesn't idle rich. You have to have your O2 sensor installed, it plugs into the stock sensor plug that runs behind the motor.

It makes perfect sense to weld in an extra bung for the wideband. The narrowband sensor should be near the stock location so that you can use the stock harness. It is not as easily affected by heat like the sensitive wideband sensor is. Your wideband sensor needs to be further downsteam if you want it to last long. That means 3' from the turbo as per the AEM instructions because the WB sensor will fail if it sees the high temperatures from the turbo. That is impossible to do without welding in an new O2 bung unless you have some magic power to just make it just appear all of a sudden.
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Old 03-17-2007, 10:17 PM   #33
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AHHHHH alright. I didnt want to have to weld anything. I thought it was plug and play.

https://www.miataturbo.net/forums/sh...ht=install+AEM

Anyways I just read this thread and things make since now. Thanks for all the help! Ill be running like a champ soon!
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Old 03-17-2007, 10:43 PM   #34
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RTFM


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Originally Posted by Snowsurfer03 View Post
Alright I know that NB to the ECU wire has to go somewhere but that makes no sence to have to weld in an extra O2 bung!
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Old 03-18-2007, 12:22 AM   #35
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Happpy st. patricsss day. Ive spent the last few hrs drinking and working on the o2 sensor gayness!

Im so glad we have this smile now!
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