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Thread: 02 sensor problems

  1. 06-18-2007 #1
    SuperSportTruck
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    02 sensor problems

    I have a 04 Silverado SS, which I am having a problem with B1S1 02 not reading any (mV) voltage. This is causing a rich condition which I am not happy about because it is fuel washing the cylinders in my new 408. when I initially saw this problem, I replaced both 02's with OEM 02's, to see if that was the problem. Unfortunately B1S1 still reads 0 mV. I then tested the hot and ground from the 02 plug harness. which came back at 11.8xx volts, so it seems to be getting power and ground. I guess the only thing left is the signal wire, but I don't know how to test it ?? Is there any other things i could be missing ?? Thanks for any help
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  2. 06-18-2007 #2
    WS6FirebirdTA00
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    sounds like you have a cut signal wire

    put the car in open loop until then, dont screw up a motor when you have control over it.
    Sulski Performance Tuning
    2000 WS6 M6 - LS6 (long block, refreshed top end), 10.8:1 CR, 90 mm ported FAST, Exo-Skel, 227/232 cam, QTP HVMC, EWP, GMMG, 9" w/4.11s
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  3. 06-19-2007 #3
    SuperSportTruck
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    Anyone know what voltage should read of the signal wire with key in run position ?? anyone know which of the 4 wires it is ?? i know pink is hot, black is ground, but other 2 not sure about
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  4. 06-19-2007 #4
    WS6FirebirdTA00
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    purple and white should be signal. Signal wire should read around 500 mV give or take a few hundred.
    Sulski Performance Tuning
    2000 WS6 M6 - LS6 (long block, refreshed top end), 10.8:1 CR, 90 mm ported FAST, Exo-Skel, 227/232 cam, QTP HVMC, EWP, GMMG, 9" w/4.11s
    2018 Sierra SLT 5.3L A8 - Airaid intake tube, GM Borla catback, L86 Intake/Ported TB
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  5. 06-19-2007 #5
    SuperSportTruck
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    Quote Originally Posted by WS6FirebirdTA00
    purple and white should be signal. Signal wire should read around 500 mV give or take a few hundred.
    WS6 thanks, I am going to check that out tonight and I will post what I find..
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