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Thread: Attempting to get tune correct so no gas pedal is needed on cold starts...

  1. #1
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    Question Attempting to get tune correct so no gas pedal is needed on cold starts...

    Basically have tried adding air with table B4343, but I can't seem to get my cammed lq9 to start and stay running without giving it gas on cold starts.

    It only starts without pedal effort when it is up to operating condition.

    I am posting a log of a cold start attempt without touching the gas I did this morning. It starts but dies a second later. Then have the full warm up logged in Drive. Also attached tune file

    +DFCO1300_1200.ctz
    LS1B_0163.efi

    Any help?

  2. #2
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    No help?

  3. #3
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    Read this thread and follow the instructions, should get you pretty close.
    http://forum.efilive.com/showthread....ips-amp-Tricks
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, starting the mods
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

  4. #4
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    Quote Originally Posted by ScarabEpic22 View Post
    Read this thread and follow the instructions, should get you pretty close.
    http://forum.efilive.com/showthread....ips-amp-Tricks
    Already have all that taken care of.

    It idles fine, I am trying to get cold start idle to occur without giving gas. Right now I have to give a little gas for a few seconds before letting off and idling fine.

    Trying to get to where I just start the truck and it goes straight to idling fine.

  5. #5
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    Look at B4343 and B4304 and the other parameters associated with that group of parameters.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, starting the mods
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

  6. #6
    Lifetime Member macca_779's Avatar
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    Add air to start up friction in the areas it's having trouble

  7. #7
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    I have already messed with b4343

    The values below are what are in the tune file I have attached to my first post.

    Do I just keep adding air until the problem goes away? Because its already higher than any idle tutorial I have seen so far.

    My current Startup Friction Air flow correction
    -40 F 15.500000
    15.000000
    14.500000
    14.000000
    13.500000
    13.000000
    12.500000
    12.000000
    11.500000
    11.000000
    9.500000
    9.000000
    8.500000
    8.000000
    8.000000
    284 F 8.000000
    Last edited by sac811; October 31st, 2013 at 09:41 AM.

  8. #8
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    Anyone have any suggestions after looking at my tune file and the log on what to do?

  9. #9
    Joe (Moderator) joecar's Avatar
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    I'm still looking and thinking...

  10. #10
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    Cam specs?? Idles at 54-56 kpa Probably not real big I hope. Why are you setting the idle only 725 rpm? Comanded afr does not equal actual afr. How did you tune the ve and maf tables?
    1997 S10, 06 trailblazer SS LS2 swap, 4L70E trans, 76mm turbo. Factory ZQ8 suspension. 3.08, G80 w/a zexel. With a 0411 swap.

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