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Thread: confused ?????????

  1. 01-04-2015 #1
    slobalt342
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    confused ?????????

    noob
    my fuel trims are good after i tuned them. but when i drive for 10 min or so my afr gauge (aem) goes really lean for a bit then rich for a bit and then back to normal. i scaned the car when this was happing and my fuel trims where fine.??? so idk why it is doing that. it doesnt feel slugish at all. im crusing when it normally happens.
    anyone have this problem. i would love the input and thanks in advance.

    cruise log 1.hpl

    this is the log i took from earlier today. it happens around 12 min in
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  2. 01-04-2015 #2
    5FDP
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    Looks like a cat test.

    Rear o2 sensor removed and running catless??

    Are tuning a 99-06 truck or 07+ truck by chance??

    99-06 need the rear o2 sensors plugged in to stop the tests. 07+ should be able to shut off the cat tests inside the PCM, it's under something on the engine side.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.
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  3. 01-04-2015 #3
    slobalt342
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    i have the rear 02 shut off in the tune, and yes im catless.
    im tuning a 05 gto m6 sorry forgot to put that.
    i have one rear 02 plugged in and the other is my wideband
    i can look for a cat test in my tune though.
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  4. 01-04-2015 #4
    slobalt342
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    i just check the tune and under engine diagnostics their is a cat check. i just disabled that and i also disabled the post o2 check as well
    well let you know if this works.
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  5. 01-05-2015 #5
    slobalt342
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    It worked. But my fuel trims are wacked out..Looks like i will be doing some driving today to get them back in order.
    Thanks man
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