Air Fuel Ratio Guage Help

[ice111103]

Before everyone flames me, yes I know I need a wideband for accurate readings. I just don't have the money/time for that right now. With that being said:

I have an Autometer narrowband A/F guage (part # 4375). I have a "plug and play" connector I got from SHO Bros that is feeding it from the rear O2 sensor. The problem is that when ever it is on it only reads pegged rich. Even before that car is started.

Is there an electrical problem? O2 bad? (I just replaced them like 3 weeks ago) Should I try another jumper?

I have it connected to that O2 because I have the SHO Bros headers on the car and it takes into the connector. The front O2 only taps into the middle header tube.

Anthony

 

[SASHO91]

Sounds like it's not getting a signal from the O2 sensor. IIRC, that's what mine does.

FWIW, while I agree that a wideband is one of the best ways to know what your engine is up to, however the narrowband gauge is useful. I run mine so I can see if anything is wrong (i.e MAF is dirty etc.) and to monitor while i'm on the bottle.

 

[ice111103]

If the power wire form the 0@ got grounded some how would that ruina new O2? I have a pinched wire going to the guage before.

 

[whiteman_01]

I just put my gauges in my new car yesterday. I don't have the plug and play thingy that you do, so i just tapped into the black wire on the rear o2 sensor. Whats wierd is when i had the same gauge hooked up in my 92, the same way, the gauge acted very different then it does now.

In the 92 it would just swing from black go all the way to the top of stoche, and then back down to black again. The only time it would stay lit is at WOT. Now, in the 94 its always lit and floating around in the stoche area unless i am ideling to a stop light, then it goes to the first light in the lean area (one below stoche.)

 

[ice111103]

Mine would float around a little at idle and then go rich under throttle. Then I had a wire get pinched going to the gauge and the guage was always black. I replaced the O2s (because they were old, and I thought the one might be bad and leading to the guage not working) and then fixed the pinched wire. Ever since then the guage only reads super rich at ALL times.

 

[kzoosho]

When i had mine it would peg under wot but only that . Any other time it would read . I now have a wideband.

 

[whiteman_01]

Mine doesnt peg at all. Well, it hasnt yet anyways, its only been a few days.

 

[Lupo]

Normally (after the gauge warms up) under idle, cruise, or partial throttle, the gauge should go back and forth, showing the ECU is in closed loop mode. It should show go rich under WOT.

My idle used to show rich because I got a 255lph pump and still had the stock FPR. As soon as I got installed the FPR, no rich readings during idle.

 

[ice111103]

I can have the car OFF and it still is pegged rich. Is the O2 Bad?

 

[SASHO91]

I highly doubt that as your CEL would be on... It's a connection for the gauge(signal wire).

 

[ice111103]

CEL doesn't work......another problem I am looking into.....I can scan it with a scan tool (which I am pretty much doing weekly since the CEL doesn't work and see if there is any codes.