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Thread: Cold start issuss

  1. #21
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    There's a few of those. Wouldn't happen to have the exact number would you? 218/224 .553/.553 110+0 is the V2, for example.

  2. #22
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    yes that is the exact one, i appreciate you helping with this thanks

  3. #23
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    Alright then here you go. Deka 80 info, and I sanitized the VE a little.

    Use this then post a log, please. Include cylinder airmass, dynamic airflow, injector pulsewidth per bank, and STIT.
    Attached Files Attached Files

  4. #24
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    okay i will write and log this tomorrow i really appreciate it, tomorrow after work ill post it

  5. #25
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    LOG3.hpl
    LOG4.hpl

    It started really rough, had to adjust throttle some for the IAC so first log 3 is the original cold start, log 4 is the after IAC throttle plate adjustment

  6. #26
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    i had to give it throttle to stay running on the cold start it kept dying

  7. #27
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    Its very rich. It doesn't make sense worrying about IAC counts right now. Get the fueling a bit closer, else you'll bake in extra air you don't need.
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  8. #28
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    So I?m fully new to the tuning at all, what would get me to be able adjust that mixture down? I see that they are -30% fuel trims so it?s really rich, and then the o2 is 900mv

  9. #29
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    Adjusting the VE table based on the fuel trims. Tune is setup to use STFT's right now. LTFT is disabled, but there are residual values left. Please use VCM Scanner>Vehicle Controls & Special Functions to clear them. Load this tune and log.
    Attached Files Attached Files

  10. #30
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    LOG5.hpl
    LOG6.hpl

    still had to throttle it to get it started and when in open loop if throttle will die, log 5 is the cold start one, log 6 is after warmed up.

  11. #31
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    It's still pretty far off. Add STIT to the logs, too.
    Attached Files Attached Files

  12. #32
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    How to add STIT

  13. #33
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    I looked for that the other day when you said but I couldn?t find it

  14. #34
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    Specific Parameters>Engine>Idle>Idle Adapt (STIT).

  15. #35
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    its definitely getting better no throttle req for startup, it did die the first startup but it fired the second time and caught itself,


    LOG7.hpl

  16. #36
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    take a look at this, im unsure if im doing it right, but my fuel trims seem closer but im unsure if this is correct still, this is the tune i adjusted the VE table some

    log9.hpl


    truck tune 1_Deka 80_SD_3 (1).hpt

  17. #37
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    Hey that's pretty good. Keep doing it and you'll get there.

    For the dying at startup copy-with-axis your VE table to the Cranking VE table. It'll only do 3 columns, 400, 800, 1200rpm, but a linear interpolation between them will suffice. 1200rpm and up will be the same. Use horizontal smooth 3x between 280-400rpm.
    Last edited by SiriusC1024; 01-14-2024 at 12:18 AM.

  18. #38
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    okay thanks i appreciate it, so the goal is to get these fuel trims as close to 0 as possible correct? or do you just aim for +-10?

  19. #39
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    Within 5% if you can for VE.

  20. #40
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    is there something to adjust per temperature? it seems like it doesnt run right until it hits 180 degrees