3.4v6

i have an autometer air/fuel ratio gauge and was just wondering if it is supposed to bounce back and forth or just sit still and slowly move.

asudan96Runner

Sounds like you do not have a wideband o2 sensor, or a/f gauge. That's okay. In your case it will only be accurate (and should also be stable) at WOT. (Wide open throttle)

What kind of results are you seeing at WOT?

Dan

3.4v6

at WOT only the last 2 green lights(rich) are the only ones lighted up

LD Gear

What year 3.4 and just where did you tap into the O2 sensor? the reaso I ask I have one also and it says not to tap into a Shielded wire but the wiring digram I have says the wire going into the ECU is shielded????? Let me know THANKS

Peace Ron

3.4v6

i have a 01 taco. i tapped into the second o2 sensor on the purple wire. how do you know if the wire is sheilded? thanks

LD Gear

That is what my wiring diagram says, I don't know if it makes a difference though? Do you have 2 o2 sensors? and why the back one and not the front one? sorry for all the ?'s I'm just not that good at electrical crap...........

Peace Ron

heliax

Just fyi, your 2001 has a wideband O2 sensor which is incompatible with your Autometer guage. You will have to either get an old style narrowband O2 sensor off an older toyota, or buy the narrowband O2 sensor kit from autometer and have it welded into your exhaust. gl

3.4v6

yea i have 2 o2 sensors. i tried connecting the o2 sensor in the front but it wouldnt work ,i dunno why, the last o2 sensor near the middle of the truck is the one that worked for me.

3.4v6

so i can either can an o2 sensor from an older toyota ... how much older?
thanks

cstary

yes, it's called "dithering," and it's the result of the system being in a "closed loop" circuit, where the ECU is trying to find the best A/F ratio. it should dither at a rate of at least once every two seconds (0.5Hz).

under heavy (>80%) throttle, the ECU switches into "open loop," and that is where the tuning occurs. with an s/c, the last two lights should light up (A/F ratio of 13:1 to 12.5:1).

creed

cstary

it doesn't sounds like he has the newer A/F meter . . . he would be reading a constant 3.3V if he did. sounds like, for some reason, he has a truck with an EGO . . . maybe it was an out-of-state truck?

creed

heliax

.Yeah I was thinkin that as well...to be honest, I'm not sure how the autometer gauge would react is why I didn't mention it. I'm guessin it would be blank if it's a WB O2...but if it is showing the last two leds at WOT hmm

cstary

the AM guage is just like SS gauge . . . a series of LED's with different in-line resistors, that light up at particular voltages in the 0-1V range, which is what the output of the EGO is. you could get by with just a voltmeter to tune with if you wanted.

this is for the SS guage:

http://www.splitsec.com/products/arm1/arm1ds.htm

creed