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Thread: Cold Start issue. O2 sensors whoas

  1. 12-23-2019 #1
    JackJack4.8
    JackJack4.8 is offline
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    Cold Start issue. O2 sensors whoas

    Truck is an 08 GMC Sierra. 7875 turbo, 80lb Deka injectors, Walbro 425 in the tank.

    Having an issue with cold starts. Still working on the tune but the cold starting issue is one of the worst problems. I am an HP tuners noob so any help is greatly appreciated.

    I've attached my current tune and a cold start log. I just changed my drivers side o2 sensor yesterday.

    Thanks,

    Jared

    cold start issue 2.hplJack Jack Tune.hpt
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  2. 12-24-2019 #2
    AJK13
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    Id suggest using the 2 Bar OS. I have a very similar setup and the custom OS is way easier and has boost enrichment. Disable all your LTFT/STFT, DFCO to tune your VE table from idle to boost.
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  3. 12-25-2019 #3
    Jack Jack 4.8
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    I'll look in to that. What's your set up? Do you have a tune I could take a look at?
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  4. 12-25-2019 #4
    geneass
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    check commanded afr before startup.
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  5. 12-26-2019 #5
    Jack Jack 4.8
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    What should it be?
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