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Thread: Need some help updated tune and now limiting fuel

  1. #1
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    Default Need some help updated tune and now limiting fuel

    Guys I need some help. I have been searching and reading every thread I can find on why tunes lower commanded mm3 and duration at 2800rpm and above. I have checked every limiting table that anyone has mentioned and the are all above 145mm3. Everything looks to be good but I am still having an issues with fuel limiting. I was not having this issue before I made some adjustments to the 3-4 shift points and timing on#3 on my tune. I read in one post of someone having a similar issue after making several changes to his tune he thought it was possibly a file corruption problem. I built my tune again from scratch with a fresh CSP5. Still limiting fuel above 2800rpm. Something has happened or I unknowingly changed something. I know its something simple that I am missing. Any advise or suggestions would be greatly appreciated. Thanks in advance for your help.
    Last edited by nm2769; January 20th, 2020 at 08:42 AM.

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    Been doing some logging and have found that when MINJSTAT_F 7 is active I'm limiting Fuel. Then it goes to MINJSTAT_F 19 and then I have fuel fueling. From what I have read 7 is normal and should give full fueling. I have not been able to find what 19 is. This has got me confused. Anyone have any insight on what may be going on?

  3. #3
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    Post your tune and I can take a look

    Sent from my SM-G935V using Tapatalk

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    Quote Originally Posted by nm2769 View Post
    Been doing some logging and have found that when MINJSTAT_F 7 is active I'm limiting Fuel. Then it goes to MINJSTAT_F 19 and then I have fuel fueling. From what I have read 7 is normal and should give full fueling. I have not been able to find what 19 is. This has got me confused. Anyone have any insight on what may be going on?
    Click image for larger version. 

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    That is what Cummins shows FS 19 is. If you post the tune I'm sure someone could help you out. You should be able to obtain full fuel with what is in EFI Software on these ECM's.

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    Tune and last log. Thanks
    Attachment 23169
    CMB_0103.efi
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    Last edited by nm2769; January 26th, 2020 at 05:08 AM.

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    Quote Originally Posted by blackshadow View Post
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    That is what Cummins shows FS 19 is. If you post the tune I'm sure someone could help you out. You should be able to obtain full fuel with what is in EFI Software on these ECM's.
    Do you have any of the other codes from these slides? Thanks

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    Quote Originally Posted by nm2769 View Post
    Do you have any of the other codes from these slides? Thanks

    PM me email and I'll send you all the slides I have. They are getting pretty old now.

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    You need to raise the RPM limits under the engine protection tabs. Bring them all up to 6000ish or higher and then use your throttle table or boost limit table to limit your overall engine speed/max RPM.

  9. #9
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    I would try what Dom_c13b said. I did not see anything that should be holding you back. Even the RPM limiters seemed ok to me (I am on a manual). I run the following
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    If that does not work try the old tune again and run a diff on it to see what changed.

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    Quote Originally Posted by blackshadow View Post
    PM me email and I'll send you all the slides I have. They are getting pretty old now.
    Your not setup to accept PM's got this error

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