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Air/fuel Guage Troubleshooting

choco
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choco Contributor

choco

Posted
Posted

As the title suggests,

Just installed an Autometer Pro-Comp Ultra-Lite A/F guage in an R33 RB26. Wired: Red to Power, Black to Ground and Violet to ECU O2 Sensor connection (clear wire at pin 29)

As soon as the ignition is switched on the last green rich LED lights up and the light never moves from it at all, ever.

I can't find any troubleshooting or posts anywhere with same problems and an answer.

So...

Is it a wiring issue?

O2 Sensor issue?

Is my car just that rich?

Something else?

Thanks,

Choco.

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StealthX Veteran

StealthX

Posted
Posted

First off, if your car's that rich, you'd have other problems, bad problems too. So rule that out...

Was the gauge designed for use with the stock narrow band sensors? i.e not specifically for a wideband sensor?

Double, triple check youve got the correct wire on the ECU, it sounds like you might've soldered on the wrong one.

Try this also: put a volt meter on the sensor's wiring, and have a look at the voltage when the car's running. with your hand, crack open the throttle slightly and see if they change, that will make sure your sensors are infact, working.

QWK32 Veteran

QWK32

Posted
Posted

at a guess i'd say your O2 sensor is dead. with the car running put a multimeter on the O2 sensor signal wire and check to see if it bounces back and forward between 0-1v. if you getting a constant voltage say 0.9v, then you O2 sensor is dead and that explains the reading on your A/F gauge.

paulr33 Grand Master

paulr33

Posted
Posted

please be careful. you are trying to wire up a 02 guage to a narrow band 02 sensor (there are two on the GTR)

the issue with the narrrow band ones is they are slow and narrow and are really only useful at stoich 14.7 AFR

they are useless for anything else other than giving the stock ecu feeedback during closed loop

so whilst your issue seems fundamental (wiring or dead sensor) once fixed please dont use this to tune the car

its likely thre guage will just bounce around all over the place and never show anything meaningful that resembles AFRs or how it's tuned

choco Contributor

choco

Posted
  • Author
Posted

Cheers will try the multimeter. No the gauge will not be used for tuning. Purely used as a guide if the car is leaning out and shows something needs further attention. I know they are not accurate but I figure something a little accurate is better than nothing.

Thanks for the concern anyway.

Cheers,

Allan

mad082 Grand Master

mad082

Posted
Posted

yeah it sounds like your o2 sensor is dead. new o2 sensor should give you a bit better fuel economy.

also the o2 sensor won't tell you if you are leaning out unless you are really leaning out badly. you could have your car tuned to the ideal AFR of aroung 12:1 and it will still say you are rich. you could be leaning out to around 13.5:1 and it will still say you are running rich. if they do tell you that you are running lean then you have more than likely have damage done as the car has to be running pretty darn lean before they will tell you that you are.

also it would be worth hooking it into the other o2 sensor to see if it is also dead

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
Cheers will try the multimeter. No the gauge will not be used for tuning. Purely used as a guide if the car is leaning out and shows something needs further attention. I know they are not accurate but I figure something a little accurate is better than nothing.

Thanks for the concern anyway.

Cheers,

Allan

Sorry mate but AFR guages are a waste of money. They are not even "a little accurate".

It will never do anything other than have nice colours, honest truth.

If you want proper AFR read out, you need to install a wideband and get feedback that way.

You'll never stand a chance running of factory O2 Sensors, they were not designed for that and as soon as the move of stoich, they are useless - rendering any gauge a waste of time and money.

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