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Thread: narrow band autometer gauge

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    Fuel Injected! one92rs's Avatar
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    narrow band autometer gauge

    i got an autometer narrowband air fuel gauge. it seems to jump aroun d more than i thought it would. the gauge is good. now for my question. could it jump around due to me having a heated 4 wire 02 sensor instead of a single wire 02 sensor. i know the signal is suppose to be the same. but!! would the newer 4 wire 02 sensor read faster than the older single wire 02 sensor causing the gauge to fluctuate so much.

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    the reading will fluctuate a LOT in closed loop.
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


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    RIP EagleMark's Avatar
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    Yeah I think I've seen them with the LED lights? They work well on a narrow band O2 sensor by itself for like tuning a carb. But when hooked up to the NB on an EFI system you get to see the cross counts.

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    Fuel Injected! one92rs's Avatar
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    so would it settle down with a regular one wire 02 sensor verse the 4 wire 02 sensor?

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    RIP EagleMark's Avatar
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    Not if it's still hooked up to the ECM in closed loop. In closed loop the ECM keeps cross counts going back and forth across stoich.

    Unless there's another way to wire it?

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
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    not that i'm saying it's a good idea, but a resistor/capacitor combo would essentially average out the signal and make the swingin much less noticable.

    response time to new conditions would suffer though.
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


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    Your gauge needs it's own sensor mounted in the exhaust, then all will be happy.

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    Super Moderator Six_Shooter's Avatar
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    Quote Originally Posted by lightning-jr View Post
    Your gauge needs it's own sensor mounted in the exhaust, then all will be happy.
    No it doesn't.

    The jumping from rich to lean in closed loop, while cruising or at idle is perfectly normal.
    The man who says something is impossible, is usually interrupted by the man doing it.

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    RIP EagleMark's Avatar
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    Right but for the gauge to work properly and not jump would need it's own NB O2 sensor is what he's saying...

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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    Super Moderator Six_Shooter's Avatar
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    Quote Originally Posted by EagleMark View Post
    Right but for the gauge to work properly and not jump would need it's own NB O2 sensor is what he's saying...
    Still not the case.

    It will still bounce from rich to lean, even with it's own sensor.

    Besides it's a lot of work for a NB gauge, to add another sensor for something that really equates to not much more than some dancing lights.
    The man who says something is impossible, is usually interrupted by the man doing it.

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    Fuel Injected! PJG1173's Avatar
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    for that much effort I'd put a WBo2 in and get some useful info from it.
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    RIP EagleMark's Avatar
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    Quote Originally Posted by Six_Shooter View Post
    Still not the case.

    It will still bounce from rich to lean, even with it's own sensor.

    Besides it's a lot of work for a NB gauge, to add another sensor for something that really equates to not much more than some dancing lights.
    Years ago I rigged up a 7747 with power, ALDL and O2 for the 1 volt and did get a steady reading, more of an experimant to me and forget all the changes needed but did work, it was just a jury rig situation to help a guy tune his carb. But your right even with another sensor the ECM will still throw cross counts, now if you add another sensor and can get clean 1.0 volt it does work. Why bother? I don't know...

    Quote Originally Posted by PJG1173 View Post
    for that much effort I'd put a WBo2 in and get some useful info from it.
    Yup!

    So you got the gauge, was there any info on how to get a NB O2 sensor powered for gauge without ECM? Depending on ECM I have seen some stop cross counts in certain situations. Like my LT1 in WOT I get steady o2 readings from each side. No cross counts...

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

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    Mark, carb or computer controlled carb?

    one should cause swinging, the other shouldn't. well, not much anyways, compared to a CCC/TBI/MPFI.

    at WOT, you shouldn't be getting cross counts... if you are, that means you're switching from lean to rich over the stoich point.
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


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    Fuel Injected! PJG1173's Avatar
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    Quote Originally Posted by EagleMark View Post
    So you got the gauge, was there any info on how to get a NB O2 sensor powered for gauge without ECM? Depending on ECM I have seen some stop cross counts in certain situations. Like my LT1 in WOT I get steady o2 readings from each side. No cross counts...
    shouldn't need power to the O2 unless its to power a heating element. the o2 will generate its own electricity to create the signal voltage.
    87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
    93 S10, 36x12.5x15 TSL's, custom turbo headers, 266HR cam, p&p vortec heads, $0D Marine MPFI with 8psi boost.
    05 Silverado, 2' lift, 4" exhaust, Bully Dog programmer,

  15. #15
    RIP EagleMark's Avatar
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    It was a 1227747 I used the O2 sensor wire for, hooked up to power, ALDL for data and I forget what changes I had done to chip... I thought the ECM supplied a 1 volt to O2 on that? It's here in a box somewhere, worked then help him get right jets in his carb car with no CCC ECM. Like I said it was more an experimant for me and worked well for him, probably a simpler method but that's all I knew how to throw together.

    So with a seperate O2 sensor to gauge it'll work?

    When I finish this harness on my test bench and get it running I'll have to check now just for curiosity...

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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