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Thread: Sierra 6.2 2015 E85 problem with cranking.

  1. #1
    Potential Tuner
    Join Date
    Sep 2022
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    Bordeaux, France
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    Sierra 6.2 2015 E85 problem with cranking.

    hello,

    i have a 2015 gmc sierra with the 6.2 that i modified to flexfuel with the fuel sensor and modification of the tables and i have cold start problems.

    i mainly use only e85 all year round because it is easily found in france.

    in france, the cold arrives with a lot of humidity in my region, my sierra does not start the first time from 14?Celsius but especially with more than 80% humidity it is difficult.

    i am happy with all the settings i made but i would like to solve this cold start problem.

    here is my map
    sierra 261024 E85 reglage moteur +boite + ventilo avec humidit? et ajout d?marrage.hpt

  2. #2
    Senior Tuner edcmat-l1's Avatar
    Join Date
    Aug 2006
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    4,730
    Without seeing a data log and just going by symptom it sounds like you should be addressing this with cranking fuel. Would be better to see a data log of it cranking when cold.

    What does it do? Cranks, no start, but does it do anything at all? How many times do you have to crank it to get it to start?

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  3. #3
    Potential Tuner
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    Sep 2022
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    Bordeaux, France
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    indeed thanks for the remark and I will make a log of it ��, in fact it does not start on the first start but on the second