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Thread: random hard to start and coast to idle

  1. #1

    random hard to start and coast to idle

    6.0 camed engine .hard to start some times with out pressing accelerator, Also coast down (driving)to idle cuts off .Throttle followers setting still stock I think that's the problem .insight please any one
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    learning

  2. #2
    Advanced Tuner Lakegoat's Avatar
    Join Date
    Jul 2012
    Location
    Florida
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    774
    I would add some base running airflow from 200 to 1000rpm. To make it easy, just add 1.00 to all those numbers and see what that does. You may need to add a little more. You have 25 degrees for idle spark. Try to lower that to around 18. Add a little more cranking fuel and see if that helps. Your Maf curve is probably in need of adjustment and that will help. It is supposed to be smooth as is your vve tables. Here is your maf curve.
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    2005 GTO, TrickFlow 225, Magnuson 2300, 4L80, 4 link 8.8
    2013 Silverado 5.3, 6L80

  3. #3
    thanks for the reply
    learning