Need help on install. of Air Fuel Ratio Guage

[warren]

Has anyone installed an air fuel ratio guage and used a O2 sensor wire
closer to the PCM ???
Logan posted a thread last yr. that said to use the black wire off the
O2 sensor. However I want to connect closer to PCM up the firewall on the
drivers side. Using the source of the Front drivers side
O2 sensor. Tried the Rd.& Blk wire off the C1033 connector and no
luck. Should I look for the Gry/Rd wire and try it ???
Have any of you done this with success and what wire did you use ???

Thanks,

WarrenB
:help:

[warren]

Has anyone installed an air fuel ratio guage and used a O2 sensor wire
closer to the PCM ???
Logan posted a thread last yr. that said to use the black wire off the
O2 sensor. However I want to connect closer to PCM up the firewall on the
drivers side. Using the source of the Front drivers side
O2 sensor. Tried the Rd.& Blk wire off the C1033 connector and no
luck. Should I look for the Gry/Rd wire and try it ???
Have any of you done this with success and what wire did you use ???

Thanks,

WarrenB
:help:
Got the answer FROM Auto Meter (Their tech. dept. is sooooo sharp)

Indeed it's the Blk. wire coming from all O2 sensors that's the signal
return wire to use......However !!!
Do Not use the back after Cat. sensors - they won't show true info.
Use only sensors closest to exhaust manifolds.

To connect close to the PCM use (solder connection only due to loss in
voltage with Any Other kind of connection !!!)......(this is a must for any
kind of air fuel sensor connection)

For Drivers Side use Red Wire with Black Stripe going to pin 87 of PCM.
(that takes care of the HOT side cyl. 7 & 8)

For Passenger Side use Gray Wire with Lt. Blue Stripe going to pin 60
of PCM.

WarrenB:D

[Logan]

A smart man sticks a switch on his bezel to switch between the left and right O2 sensor... :)

[David Morton]

Frogive me for prying but, why do you want to do this?

Are you tuning? Why not use the PCM data since it's bound to be more accurate than your eye and a guestimate of A/F ratio @ rpm?

Enquiring minds want to know.

[darebren]

it just occured to me, I have the air fuel ratio guage (it does get annoying to look at) and I tapped into the driver side O2 sensor wire... but I am only reading it from that side.. not a mix between the 2 or able to switch from side to side..

being an open loop the guage moves from lean to rich constantly, and pegs at rich under wot when the loop is closed so the thrill of watching it dies soon after install... it is still cool at night though when someone next to you asks what the heck is that guage on the a-piller next to you... that is cool looking.

I wish it had a digital readout so you know exactly under WOT what the ratio is...

[Logan]

I plan on replacing mine with a wide-band unit. Much more meaningful. The Autometer one is not much more than pretty lights...

[SergntMac]

http://www.widebandcommander.com/product/gauge.htm

Rather pricy, but lot's of features. Would mounting this at the X pipe work?

I know there is a digital out there somewhere, can't find it right now...

[TripleTransAm]

Are you tuning? Why not use the PCM data since it's bound to be more accurate than your eye and a guestimate of A/F ratio @ rpm?


I agree. I don't know much about the A/F ratio gages being discussed here, the ones that tie into the stock O2 sensors are (as mentioned) nothing more than pretty lights.

The stock O2 sensors are narrowband. That means the window of operation (ie. the range of air/fuel ratios that will provide the full 0-1000 mV swing from an O2 sensor) is very very narrow. The slightest deviation towards rich or lean will peg the reading, 99.9% of the time. So there is very little way to determine if a car is running rich or lean in normal operation... the whole operation is designed to oscillate in this fashion.

Even under WOT conditions, the sensor will peg (ie. close to 1000mV) regardless of whether you've got 12:1, 12.5:1, 11.5:1...

For overall tuning purposes, you're better off looking at the trim values anyway in the PCM. Over time, the PCM will adjust the mixtures depending on how much more often the O2 sensors are in one half of the swing. You can detect a leanness or richness over time in this fashion.


But for immediate air/fuel mixture tuning (especially at WOT), it's a wideband sensor that's absolutely necessary.

[warren]

Well ..... I connected the A/F Ratio up & the bar does not work.
It just keeps going up and down without stopping ?

The volts go from .12 to .73 about every second unless I am at WOT
then it pegs on rich and .7V ???
My MM has 29K+ - could the O2 sensor be out so early???
Has anyone else had that problem?
Any thoughts?

WarrenB:depress:

[warren]

Gauge is OK.
Stopped at the local Cobra dealer and..............
the mechanic says the O2 sensor black wire ( which becomes the
red with black stripe wire )
is supposed to go .120 to .750 up and down every sec..
He says the PCN is always making changes ???
I can only tell that I am rich 12.7:1 at WOT
the rest of the time it jumps up and down.???
The factory ( Cyberdyne ) says it's the way my O2 sensor works!!!

Any Thoughts???

WarrenB:depress:

[TripleTransAm]

Read my post...

[David Morton]

I agree. I don't know much about the A/F ratio gages being discussed here, the ones that tie into the stock O2 sensors are (as mentioned) nothing more than pretty lights.

The stock O2 sensors are narrowband. That means the window of operation (ie. the range of air/fuel ratios that will provide the full 0-1000 mV swing from an O2 sensor) is very very narrow. The slightest deviation towards rich or lean will peg the reading, 99.9% of the time. So there is very little way to determine if a car is running rich or lean in normal operation... the whole operation is designed to oscillate in this fashion.

Even under WOT conditions, the sensor will peg (ie. close to 1000mV) regardless of whether you've got 12:1, 12.5:1, 11.5:1...

For overall tuning purposes, you're better off looking at the trim values anyway in the PCM. Over time, the PCM will adjust the mixtures depending on how much more often the O2 sensors are in one half of the swing. You can detect a leanness or richness over time in this fashion.


But for immediate air/fuel mixture tuning (especially at WOT), it's a wideband sensor that's absolutely necessary.My reasoning exactly, dude. You sound like a "high-tech" to me.

I think this A/F ratio thing is something they thought up for folks that have more money than brains. Not trying to flame anybody but I think it would just be taking up space better used for something much more useful...

...like a differential fluid temperature guage. :lol: