conlinj

I installed an air/fuel gauge that I got from 818camaro95 into my car, and all it was doing was reading Rich. So I put a multimeter on signal wire and it's reading over 2 volts. The sensor I'm using is a Bosch heated 02 sesnor for a zr1 corvette. I know the range should be between .050 and 1.00 volts for the gauge to read. Basically what I'm asking is do you think it's a bad o2 sensor? It's a carb car so it's not hooked up to a pcm to trigger a ses light.

-Jim

Duts87ss

Since it's a carbed car, try leaning out the idle mixture to see what happens before you spend the money on a new O2 sensor. If you can get it to read correctly at idle, then you can move on to getting the cruise and power enrichment worked out.

conlinj

I got everything all squared away, now I jsut have to install another in the passenger side exhaust.

Thanks,

-Jim

Duts87ss

What was the problem?

conlinj

It was the heater, I unhooked that and it read fine. Told me everything I already knew about the carb. Time to back the jets out a bit.

-Jim

RednGold86Z

Those AFR gauges that use a narrowband O2 sensor are about as accurate as a weather vane is at telling you wind speed (i.e. they just point in the direction of the wind).

1987IROC350

But they look good at night in a pillar pod

cas0484

Yeah, those things are strictly for show, you can't gain any remotely useful information from them other than being to tell if the 02's are working or not.

thirdgenrallysport

new ones out are supposed to be accurate to within 0.1

A/G

The problem is not the gauge. The problem is the signal sent by the O2 sensor. The NB sensor is designed to be accurate and/or dependable @.45 volts, and is used at this voltage as a switch only. It is constantly giving the PCM feedback to continuously add and remove fuel with it's signal toggling on either side of .45V. The NB O2 sensor, unlike a WB, is very temp sensative. Not only is it's accuracy askewed by temp variations, the resolution of it's signal deteriorates the further it deviates from stoich. Some have used the gauge to read the signal from a WB O2.

Edit: In response to the quoted post above, it could be compared to an oil pressure gauge. The gauge itself could be accurate to within ¼#, but if the sending unit is accurate to +-10#, you wouldn't know if the readout was registering accurate #s.