It is possible with the Innovate LM-1. I'm looking into doing this because my LS1 has cats that aren't going to be removed. I need to replace one narrowband sensor with a wideband so I can monitor my A/F. The way to do this is to splice into the O2 sensor wires that go to the PCM, hook into the LM-1 and then feed the modified data back to the PCM so it still sees the NB signal. The wideband data can then be logged.

I don't want to cut these wires and I have found something from Caspers Electronics that looks like it might allow me to simply pigtail into these connectors. If you are interested and/or know anything about this, please follow this link and look at this pigtail (A/F Gauge pigtail) about 75% down the page.

http://www.ls1speed.com/catagory.cfm.../%20Electrical

I understand that it is for a gauge but if it's possible to use it with my LM-1, please chime in with what you know.

 

i think it will work . but i wanna see if someone says it won't

http://img.photobucket.com/albums/v2...2Connector.jpg
here's the ad.

 

Not exactly clear what you are trying to do. I think you are trying to plug the LM-1 Analog Channel No. 1 in to the stock O2 sensor harness so that the emulated narrow-band signal from the LM-1 can provide the narrow-band signal the PCM is looking for. What you need to do will, to some extent depend on how you plan to handle the absence of the stock narrow-band sensors' heater circuit. If you leave the stock sensor off completely, the PCM will set codes for the incomplete heater circuit. If you leave the stock sensor plugged in, you'll have the complete heater circuit, but now you'll have two sensors attempting to feed the PCM.

Or did I completely miss the point of what you are trying to do?

I'd have new bungs welded to both sided of the exhaust, so you could log either side with the LM-1, without worring about the stock sensors/PCM.

 

Yes you understand what I'm trying to do. I will need to keep my NB sensor heater wire(s) connected for the reason you explained. Another reason for the pigtail is to keep me from cutting into the original harness. What I hope will work is if I can cut the wire on the pigtail that goes to the narrow band sensor element - on the PCM (EFI) side. I hope to connect this wire to the #1 analog out connection on my LM-1 so the PCM can see the simulated NB signal. I would then just cap off the other end of the sensor element wire.

The single wire on the pigtail that would go to a gauge will probably not be needed. Does this sound like it will work? It's very hard to describe this. I'm not getting many answers on the Innovate board because I think I'm not doing too well with my description.

Can you tell me if our narrow band O2 sensor element produces voltage rather than resistance as a signal? I ask because the LM-1 manual says 1% of the cars use an O2 sensor that alters resistance according to gas content changes. These cannot use the #1 analog output on the LM-1 for a NB signal.

I still have my stock manifolds and there's very little room for another bung. That's why I am hoping to use the narrow band bung for the LM-1 meter.

Thanks.

 

Anyone else have any ideas or advice?

I think I've got it worked out now but it would be a good thing to hear from someone who has done this or knows for sure. Thanks.

 

just have the heater codes tuned out of your pcm, i do it when i tune out the rear's for people so they can completely eliminate the rear o2's(of course this is for off road use only)lol

 

The stock O2 sensors produce a variable voltage signal, ranging from 0-1.0V.

The stock 4-wire sensor includes a signal wire and a ground for the signal side. I would think that somehow you need to complete the ground from the wide-band sensor to the PCM harness ground wire.

 

Thanks, I think then that when I ground the body of the narrowband sensor it needs to be common to a ground for that particular circuit of the pcm harness. I somehow have to think that if the old sensor is grounded to the engine or at least the exhaust it will be the same as if it is completed in the pcm's circuit for the sensor. I'm cutting no other wires other than the high side signal. All grounds and power will still be connected. The only thing different other than the one cut wire going to the LM-1 will be the contact with the exhaust bung. If this doesn't work then I'll also ground the LM-1 to the exhaust. I'll post the results as soon as I have this thing installed.