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Thread: getting knock under wot

  1. #221
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    no idea what that is let me see.

    edit ok i see what you are saying
    Last edited by smasher; 09-22-2024 at 03:25 PM.

  2. #222

  3. #223
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    Quote Originally Posted by DodgeZ View Post
    yes that one seems to work well everything works now back to knocks sensors acting weird. Did you have to do the segment swap or change something in the system options because that's what I noticed had changed

  4. #224
    I set the "unused" to 0 in the system options. I did a segment swap with the old 4l80/8.1L tune file. I also disabled the DTCs for the flex fuel sensor. I added some notes in the notes area.


    I am not sure about the knock, I think you fixed a ground for the knock sensor in the middle of messing around with the flex OS? Sirius would be better at the spark tuning than me. Maybe the timing you were running before was not good but the sensor not being ground right didn't show it? Do you have a log from the working Flex fuel tune? I'd post a fresh log and the current .HPT tune you are running for Sirius to look at.

  5. #225
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    yea I was wondering about the system options it wouldn't let me change anything on that for some reason. but it runs great. ill update when I get a better log and make sure everything is good.

  6. #226
    Quote Originally Posted by smasher View Post
    yea I was wondering about the system options it wouldn't let me change anything on that for some reason. but it runs great. ill update when I get a better log and make sure everything is good.
    You can only pick one or zero, even though it show 255

  7. #227
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    Quote Originally Posted by DodgeZ View Post
    You can only pick one or zero, even though it show 255
    yea that is weird that it would show 255 on the others

    Edit I don't have a update everything runs well idle is kind of wonky. if I'm sitting at a idle for a while it will rise.
    Last edited by smasher; 09-22-2024 at 08:27 PM.

  8. #228
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    SD12 log looks totally fine.

  9. #229
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    Quote Originally Posted by SiriusC1024 View Post
    SD12 log looks totally fine.
    I figured the flex stuff would start complicating this process pretty quick, but at least you got him to the point of having a good running file to fall back on if anything goes too far into the weeds.

  10. #230
    Quote Originally Posted by SiriusC1024 View Post
    SD12 log looks totally fine.
    Was that after the knock sensor wiring? What would cause knock at the same timing. I guess a log is needed to see what is going on. Do you know if needing to do a crank relearn could cause knock? This a file from another motor, the crank learn would be from it, I am not sure if that would cause knock though.

    Quote Originally Posted by gametech View Post
    I figured the flex stuff would start complicating this process pretty quick, but at least you got him to the point of having a good running file to fall back on if anything goes too far into the weeds.
    This was very helpful, thank you for sharing.

  11. #231
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    Quote Originally Posted by DodgeZ View Post
    Was that after the knock sensor wiring? What would cause knock at the same timing. I guess a log is needed to see what is going on. Do you know if needing to do a crank relearn could cause knock? This a file from another motor, the crank learn would be from it, I am not sure if that would cause knock though.



    This was very helpful, thank you for sharing.
    Everything runs good and works ill probably go ahead throw the sensor on and pin it in within the next couple of weeks.

  12. #232
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    Quote Originally Posted by DodgeZ View Post
    Was that after the knock sensor wiring? What would cause knock at the same timing. I guess a log is needed to see what is going on. Do you know if needing to do a crank relearn could cause knock? This a file from another motor, the crank learn would be from it, I am not sure if that would cause knock though.
    After the wiring. I'm not sure what's making the difference.

  13. #233
    When you copy over a new OS and config from another truck it wipes out all of the old settings, I am 99.9% sure the crank learn settings would be from the truck the file came from. There are setting in there so it wouldn't pop an error code to rerun it. So if it is running the settings from a different block, crank sensor, crank. Maybe it is a degree or more off? The timing is based on the crank sensor, right? The crank relearn should be done with a new OS. Not sure if that would cause the KR but I can see how it could impact it if timing was already on the edge.


    https://ls1tech.com/forums/pcm-diagn...ml#post1814144
    Last edited by DodgeZ; 09-23-2024 at 01:56 PM.

  14. #234
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    Yes a crank relearn should be done.

  15. #235
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    Quote Originally Posted by DodgeZ View Post
    When you copy over a new OS and config from another truck it wipes out all of the old settings, I am 99.9% sure the crank learn settings would be from the truck the file came from. There are setting in there so it wouldn't pop an error code to rerun it. So if it is running the settings from a different block, crank sensor, crank. Maybe it is a degree or more off? The timing is based on the crank sensor, right? The crank relearn should be done with a new OS. Not sure if that would cause the KR but I can see how it could impact it if timing was already on the edge.


    https://ls1tech.com/forums/pcm-diagn...ml#post1814144
    ok ill see if that works I'm still getting the same knock and it doesn't matter which tune is in there. no knock sensor codes though.
    Attached Files Attached Files

  16. #236
    What long tube headers did you go with? Did you cut the "ear" off the 4l80e to get them to clear? I assume you installed new motor mounts? Anything that could be banging or rattling?

  17. #237
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    Quote Originally Posted by DodgeZ View Post
    What long tube headers did you go with? Did you cut the "ear" off the 4l80e to get them to clear? I assume you installed new motor mounts? Anything that could be banging or rattling?
    yes to all of that. I may have gotten it to stop ill check it again tomorrow I took a little out of the out of the sensor level.

  18. #238
    I thought Sirius said it cleared up in the old OS?

  19. #239
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    Quote Originally Posted by DodgeZ View Post
    I thought Sirius said it cleared up in the old OS?
    it just keeps coming back after a couple of days. doesn't make sense to me.

  20. #240
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    In that last log the P0327 low voltage knock sensor code was present.