Air/Fuel Guage ...
Air/Fuel Guage ...
I had my Air/Fuel guage hooked up to my ECU but the readings were inaccurate so I took it off and connected it to the WHITE sensor wire under the hood. Once I did this I got no reading at all. So my question is where the hell do I hook up this wire. I talked to BOE and he said hook it up to the white wire on the ecu but I have no idea where it is. BOE if u readin this is there any diagram I can look at to find it? It's impossible to follow the wire from the motor to the ecu cuz its in a black tube and bundled up. Well if anyone has one and can help plz reply, thanks.
do you really NEED the afr guage? i monitor EGT and its been working for me. but if you do have to connect it to the ecu, your only option is to open that thing up and find all the wires, you might need to get a service manual so you know what wires to go into. sory i couldnt really help.
Damn...I love these forums. Thanks guys. Yo Rhyzin...do I hook it up to the 02 SENSOR or the AIR/FLOW SIGNAL Sensor. I think before I had it hooked up to the 02 SENSOR. That may be why the readings were all f*d up.
It should splice into the o2 sensor line. As for the readings, you need to consider that you're pulling readings from the stock o2 sensor so it won't be very accurate to begin with. And on top of that, you're using a gauge that ballparks the air/fuel mixture between rich/stoich/lean.
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Well I hooked it up to the 02 SENSOR wire and it's working now. It still acts kinda funny though (when car is idle the meter goes from lean to stoich to rich back and forth). And also when I smash on it the meter goes Lean most of the time but sometimes it goes Rich. Is this normal ? Is there an aftermarket 02 sensor I can get? Thanks for the help guys!!
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Buy a wideband. Eliminate inaccuracy. Then you'd need a new display too though...or a new ECU that reads 5v O2 signals. Or I suppose you could send the 1v signal to the ECU and then tap it for the narrowband gauge as well. 
Evolving Member
Joined: Mar 2003
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From: Roanoke, VA
AFR guages are stupid, and I wish I had never gotten mine. We call them expensive light shows over at NICO. You have to remember that a stock O2 sensor is reading one volt, or lack thereof, to indicate if it needs more fuel for the mixture. That's why the guage will bounce all over the place at idle, or even at cruise. When you mash the pedal, most engines will richen out a bit, but a huge amount. My guage goes a few clicks rich from stoich, so don't think the guage will go full rich when you go WOT.
Hobie said to get a wideband, and I agree. It's the only way to properly watch an AF mix, but it's expensive. Honestly, AFR guages are almost pointless. They don't let you notice anything because they're never accuarate, so how can you know if your car really is leaning out or going rich all the time.
Hobie said to get a wideband, and I agree. It's the only way to properly watch an AF mix, but it's expensive. Honestly, AFR guages are almost pointless. They don't let you notice anything because they're never accuarate, so how can you know if your car really is leaning out or going rich all the time.
Datalogging.
The true wideband output is a 5v though, so unless you get a WB modified display, the real 5v output is useless. If you use the 1v narrowband simulator for stock ECU's then you will probably still be getting the same crappy reading.
The true wideband output is a 5v though, so unless you get a WB modified display, the real 5v output is useless. If you use the 1v narrowband simulator for stock ECU's then you will probably still be getting the same crappy reading.
Evolved Member
Joined: Nov 2002
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From: Seattle
Originally posted by tenkawa_akito
AFR guages are stupid, and I wish I had never gotten mine. We call them expensive light shows over at NICO. You have to remember that a stock O2 sensor is reading one volt, or lack thereof, to indicate if it needs more fuel for the mixture. That's why the guage will bounce all over the place at idle, or even at cruise. When you mash the pedal, most engines will richen out a bit, but a huge amount. My guage goes a few clicks rich from stoich, so don't think the guage will go full rich when you go WOT.
Hobie said to get a wideband, and I agree. It's the only way to properly watch an AF mix, but it's expensive. Honestly, AFR guages are almost pointless. They don't let you notice anything because they're never accuarate, so how can you know if your car really is leaning out or going rich all the time.
AFR guages are stupid, and I wish I had never gotten mine. We call them expensive light shows over at NICO. You have to remember that a stock O2 sensor is reading one volt, or lack thereof, to indicate if it needs more fuel for the mixture. That's why the guage will bounce all over the place at idle, or even at cruise. When you mash the pedal, most engines will richen out a bit, but a huge amount. My guage goes a few clicks rich from stoich, so don't think the guage will go full rich when you go WOT.
Hobie said to get a wideband, and I agree. It's the only way to properly watch an AF mix, but it's expensive. Honestly, AFR guages are almost pointless. They don't let you notice anything because they're never accuarate, so how can you know if your car really is leaning out or going rich all the time.
Unless your AFR is accurate, it's useless. Unless you can log and review your AFR, it's useless. Unless you can change your AFR with your current setup, it's more or less useless. But definitely do no doubt the overall usefulness of knowing your correct AFR. There's a reason they hook you up to a wideband when you're Dyno Tuning.
yup, blinky lights are crap. but the best of the crappy O2 sensors are the numeric ones. gives you voltage in .01v increments +- .01v. still inaccurate, but as far as you go before going wideband.
aem uego uses a 5v wideband but has a connection that downgrades to 1v so you can hook it up to 1v O2 gauges aside from having a connection that also outputs 5v for other sensors. and then there's the pocket logger that logs obd2 stuff for you.
kinda OT but does anyone know what to use to see what your injector duty cycle is while you're driving? or would the only way to do that is datalog an oscilloscope while driving?
aem uego uses a 5v wideband but has a connection that downgrades to 1v so you can hook it up to 1v O2 gauges aside from having a connection that also outputs 5v for other sensors. and then there's the pocket logger that logs obd2 stuff for you.
kinda OT but does anyone know what to use to see what your injector duty cycle is while you're driving? or would the only way to do that is datalog an oscilloscope while driving?