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Thread: 1500HD and DFCO

  1. 04-16-2009 #1
    jstauffe
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    1500HD and DFCO

    I've been playing with the DFCO settings on my 2002 1500HD, specs in sig. It seems that with this truck the DFCO doesn't enable until I hit 75mph. I live in northeast MD, and its difficult to find a hill to coast down that fast! I've confirmed it several times with a wide band. Decelerate down hill, hit 75, and watch the WB go way lean.

    I have attached my tuning file, and a log showing the offense. Start looking at 6550. Any help you guys can give me would be greatly appreciated. I can't find the 75 mph tag anywhere. Could there be a parameter missing for this truck, or am I the one who is missing it?

    Thanks,
    Jonathan
    2002 Silverado 1500HD CCSB. 6.0, 4L80E, Comp XR269HR, LS6 Springs, Dynatech LT's, Gibson Extreme Exhaust, HPTuner
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  2. 04-17-2009 #2
    Russ K
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    Post your stock tune & I'll set up the DFCO for you.

    Russ Kemp
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  3. 04-17-2009 #3
    slow346
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    What is DFCO? We need a list of what these abbreviations means for newbies like me!
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  4. 04-17-2009 #4
    SilverG
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    Deceleration Fuel Cut Off
    07 Avalanche Exhaust & CAI
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  5. 04-19-2009 #5
    jstauffe
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    The tune I've posted above is my most recent, but if you need the original as shipped tune, here you go....
    2002 Silverado 1500HD CCSB. 6.0, 4L80E, Comp XR269HR, LS6 Springs, Dynatech LT's, Gibson Extreme Exhaust, HPTuner
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  6. 04-19-2009 #6
    Russ K
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    The DFCO should now function.

    Russ Kemp
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  7. 04-20-2009 #7
    jstauffe
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    Thanks! I'll give it a try and let you know how it works.

    Jonathan
    2002 Silverado 1500HD CCSB. 6.0, 4L80E, Comp XR269HR, LS6 Springs, Dynatech LT's, Gibson Extreme Exhaust, HPTuner
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  8. 04-20-2009 #8
    jstauffe
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    Russ,

    Every time I try to open the file, I get an error:
    "Unable to open file. Index was outside the bounds of the array"

    Have you seen this before? I'm running version 2.22.3152.18236.

    Thanks for your help!
    Jonathan
    Last edited by jstauffe; 04-20-2009 at 12:01 PM.
    2002 Silverado 1500HD CCSB. 6.0, 4L80E, Comp XR269HR, LS6 Springs, Dynatech LT's, Gibson Extreme Exhaust, HPTuner
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  9. 04-20-2009 #9
    mustangjonGT
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    You need the latest BETA to open the file. Email support for it.
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  10. 04-21-2009 #10
    jstauffe
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    Got the Beta version. DFCO is now functional! I've attached a screen shot of the changes made, if anyone is interested. It looks like it was the DFCO Entry/Exit map vs Baro tables that did it for me.

    Thanks Russ!
    2002 Silverado 1500HD CCSB. 6.0, 4L80E, Comp XR269HR, LS6 Springs, Dynatech LT's, Gibson Extreme Exhaust, HPTuner
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  11. 04-21-2009 #11
    BOTTLE FED
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    Mine is set at 6900 in 1st and 2150 in the rest of the gears

    Entry MAP is 19 all the way

    Exit MAP is 25 all the way

    Spark blending is the same at 200

    My AF gauge goes to 11xx when I get off of the gas. Is this why?

    The car is heavily modded with a supercharger
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