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Thread: Wideband O2 install advice

  1. #1
    Fuel Injected!
    Join Date
    Feb 2015
    Location
    Ogden, UT
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    33
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    120

    Wideband O2 install advice

    When I wired in my AEM UEGO wideband gauge/controller and sensor, I thought I was being pretty resourceful by using a cigarette lighter plug for power and ground, and the 0-5v output to the EGR Pintle input in the PCM for data logging. I didn't intend for it to be a permanent install because I figured I would only use it for tuning, then take it out until I needed to make adjustments for mods. The sensor pigtail is fished down through the existing shifter hole in the floor, and the wideband sensor is in the existing location for the narrowband sensor. I've disabled Closed Loop in the bin and have been tuning in Open Loop only so far.

    Data logging has worked great so far, but I feel like I have a bug in my integration of the sensor. I have noticed that sometimes the value displayed on the gauge doesn't match what the data stream is seeing. I understand that there may be some lag between them, but for the most part they should be fairly close, within 0.1 or 0.2 of each other. Occasionally I see consistent 0.5 or so differences between readings. Enough so that when I use logged data to make VE adjustments, I bounce between lean and rich and never really settle near 14.7.

    To the others around that use a wideband sensor and log data with the PCM, do you see swings in readings like this? Should I tap into the switched 12v and grounds used by the PCM for more consistent readings? If my power sourcing is adequate, do I need to plug in the lighter plug and let the gauge/sensor initialize before starting the engine, or is plugging it in after starting ok? What are your experiences with your equipment?
    1990 Chevrolet K2500, RCLB, Blueprint 383 TBI (16197427 ECM / 80 lb/hr / 15 psi FP), NV4500, NP241, 3.42

  2. #2
    Fuel Injected!
    Join Date
    Jun 2015
    Age
    29
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    262
    You should be sourcing a ground connection from the same source as the PCM, otherwise you will see a ground offset and it will skew your readings.

  3. #3
    Fuel Injected!
    Join Date
    Feb 2015
    Location
    Ogden, UT
    Age
    33
    Posts
    120
    I got around to hardwiring my WBO2 sensor tonight. I spiced into the 12v ignition source and one of the grounds for the ECM. The readings on the gauge and data log are much more agreeable.
    1990 Chevrolet K2500, RCLB, Blueprint 383 TBI (16197427 ECM / 80 lb/hr / 15 psi FP), NV4500, NP241, 3.42

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