Can the Fiero computer would accept a different O2 sensor like a wide band? I want to try something with a after market gauge that allows me to read A/F mix, like from summit http://store.summitracing.com/default.asp?Ntt=gauges&Ntk=KeywordSearch&DDS=1&searchinresults=false&N=0&target=egnsearch.asp I do not want to do this if all I am going to get is a reading of "rich" or "lean" from the stock O2.

You would probably drill and tap in a seperate sensor and leave the ECM O2 sensor alone.

Ok, the Fiero ECM will only work with the stock-type O2 sensor, which is a "narrow band" type. If you attempt
to hook up a WB sensor you'll probably blow both the ECM and an expensive sensor.

You are correct in that the stock sensor is essentially a lean/rich switch, best to leave it alone and install a
separate WB sensor and readout device. There are many fully built ones available, or you can build your
own from a kit. I have heard good things about this one:

http://wbo2.com/2a0/2a0info.htm

JazzMan

(edited to fix the wrap from the too-long URL above)

[This message has been edited by JazzMan (edited 05-04-2005).]

wideband o2 sensor is >$200. Most if not all widebands have a narrowband output that you can connect to the ECM.

quote Originally posted by ryan.hess: wideband o2 sensor is >$200. Most if not all widebands have a narrowband output that you can connect to the ECM.

Do you have anyother info on this, looks like this would be the way for me to go then. Also I would assume from what you guys have said here that it would be a "stand alone" item, for a lack of a better term, and that there would be no way to use that info with the stock ECM.
Now what about another ECM from a different car? Is there one that would be similar to stock but allow me to use the wideband o2? the reason I ask is because I can more than likely get a ECM from a car for free from my friends junk yard.

quote Originally posted by OH10fiero: Do you have anyother info on this, looks like this would be the way for me to go then. Also I would assume from what you guys have said here that it would be a "stand alone" item, for a lack of a better term, and that there would be no way to use that info with the stock ECM. Now what about another ECM from a different car? Is there one that would be similar to stock but allow me to use the wideband o2? the reason I ask is because I can more than likely get a ECM from a car for free from my friends junk yard.

The wideband in jazzman's link (that I have) has a narrowband output. Basically you can wire it directly to the ECM. I don't understand the rest of your question, but you can use it with most any ECM. Narrowband is the kind of O2 sensor in just about every car out there. The car won't know the difference if you put in a wideband, and wire up the narrowband output to the ECM.

Interesting post, my thought was to try to install one of the heated O2 sensors in my 84.

Seems like when the sensor gets a little older it tends to throw a code quicker when you run the car, turn it off, and then fire it up again to go.

I would guess the ECM still has the car at operating temp and the sensor has cooled enough for the ECM to think there's a problem.

Any thoughts on this.

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Where will the road take you today?

Some helpful links I've done
How to remove inner door panels, with pics.
How to remove outer door panels, with pics.
How to make rear coil-overs using factory struts, with pics.

quote Originally posted by ryan.hess: wideband o2 sensor is >$200. Most if not all widebands have a narrowband output that you can connect to the ECM.

bosche released a ~50$ wideband sensor thats been driving the market price down.

but I'll assume you are also including the controller with that that outputs narrowband signal for the ecm

[This message has been edited by Kohburn (edited 05-06-2005).]

quote Originally posted by Kohburn: bosche released a ~50$ wideband sensor thats been driving the market price down. but I'll assume you are also including the controller with that that outputs narrowband signal for the ecm

Yes, that's the sensor the link above uses. Keep in mind that a wide band O2 sensor is nothing like a narrowband O2 sensor. You can't just buy the sensor, connect it to +12 and ground, and expect a wideband signal out. The signal has to be carefully processed, amplified, and the heater temperature has to be corrected for temperature fluctuations, etc... You NEED the controller. It won't work without it.

quote Originally posted by ryan.hess: Yes, that's the sensor the link above uses. Keep in mind that a wide band O2 sensor is nothing like a narrowband O2 sensor. You can't just buy the sensor, connect it to +12 and ground, and expect a wideband signal out. The signal has to be carefully processed, amplified, and the heater temperature has to be corrected for temperature fluctuations, etc... You NEED the controller. It won't work without it.

yes there are a lot of differences primarily that the voltage change goes the opposite direction for wideband vs narrow band.. so if you did plug it in and it didn't fry anything it would be reading lean when it was rich and rich when it was lean..

I have a heated narrow band oin my 3.4dohc swap and as far as I could tell it just uses a +12 for the heater as long as the engine is running.

quote Originally posted by Kohburn: yes there are a lot of differences primarily that the voltage change goes the opposite direction for wideband vs narrow band.. so if you did plug it in and it didn't fry anything it would be reading lean when it was rich and rich when it was lean.. I have a heated narrow band oin my 3.4dohc swap and as far as I could tell it just uses a +12 for the heater as long as the engine is running.

The controller is what makes the 0-5V signal, not the o2 sensor. That's what I was referring to. It's a lot more complicated than a typical narrow band.

http://wbo2.com/lsu/default.htm

Seems like the best way is to get something like what Jazzman posted a link to. Has anyone done this and used a digital readout?
The more you guys post the more I am curious as too how much of a change there is when the car is under "load" and how quick the changes are that the computer makes, a wideband would, to me, be the best way to get this info a bit more accurate that with a stock o2.

you'll find a lot more about it over at 60degreev6.com
they have a group buy going for a nice setup

quote Originally posted by OH10fiero: Seems like the best way is to get something like what Jazzman posted a link to. Has anyone done this and used a digital readout? The more you guys post the more I am curious as too how much of a change there is when the car is under "load" and how quick the changes are that the computer makes, a wideband would, to me, be the best way to get this info a bit more accurate that with a stock o2.

I don't have the digital readout, since that was a $30 feature that I didn't need. Under load, the computer doesn't make any changes. It just assumes you have a stock engine, and runs down the tables. Typically in closed loop, the ecm's making changes as fast as the exhaust can exit the cylinders...

Mines run fine for 100K without any O2 sensor at all. I didnt put one in with the turbo and welded the hole in the exhaust shut. Once it a great while it will throw a code for a few mins then go back out, uses more gas.