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Thread: E38 idle tuning

  1. #1
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    E38 idle tuning

    Alright guys I?ve looked all over and can?t find the answer so maybe some will know

    Trying to fix my idle tune. When the car is cold commanded AFR is 9.56 or .81 lambda when the car warms up it idles at 9.56 still in open loop. I?ve adjusted the open loop table but makes no difference when I give it gas to about 1500 rpm goes to 10.56 AFR .95 lambda. I am on E85 but E content is 67%ish. I just need to know where to look for the commanded eq/AFR at idle any help is appreciated

  2. #2
    Tuning Addict 5FDP's Avatar
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    Post the tune and logs.

    Having .80 lambda when cold sounds normal for many vehicles, then once over 130 degree coolant temp it will be far closer to 1.00 and go into closed loop.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  3. #3
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    Same problem here

    I am having the same problem here, see attached tune file. Insanely rich at start-up, commanding 9.6 and logging shows 20% lean. Cant stand to let it run indoors as its so rich.
    Not drivable.

    2011 ss sd step one.hpt

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    Mods? Need to modify IVT Openloop multiplier chart?

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    has a cam and 75/78 turbo. swapped back to factory injectors chasing this issue. the car runs pretty good on MAF only tune.

  6. #6
    Tuning Addict 5FDP's Avatar
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    That tune wants the MAF disabled with the way you have the MAF fail settings and the dynamic airflow settings.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  7. #7
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    Quote Originally Posted by 5FDP View Post
    That tune wants the MAF disabled with the way you have the MAF fail settings and the dynamic airflow settings.
    Yes sir, that is correct. I have MAF running fairly well but can't run SD at all because it is so rich.

  8. #8
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    startup uses the same multipliers whether its maf or vve so sounds like u just have to adjust the VE table to get it closer to where it should be, i wouldnt run that vve when boosted without adjusting it even if ur just maf as it will use vve still if it has to, just adjust the OL gas/gear/PN tables to make OL fueling not as rich as its commanding 1.3 - 1.5 in some cold areas and that way rich, looks like its been adjusted richer not leaner as above 1 is richer in those tables same as how PE works, find a stock file if u dont have one and go back to that if its closer to 1.0

  9. #9
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    Larry, did you ever change your injector data when you changed injectors? If you are turbo, I doubt your stock injectors are going to keep up. What 07GTS said, that VVE is going to go dangerously lean into boost. Put it back in full MAF until you get the VVE dialed in. Also, your high and low octane charts are the same, this is bad.

  10. #10
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    Quote Originally Posted by 07GTS View Post
    startup uses the same multipliers whether its maf or vve so sounds like u just have to adjust the VE table to get it closer to where it should be, i wouldnt run that vve when boosted without adjusting it even if ur just maf as it will use vve still if it has to, ju adjust the OL gas/gear/PN tables to make OL fueling not as rich as its commanding 1.3 - 1.5 in some cold areas and that way rich, looks like its been adjusted richer not leaner as above 1 is richer in those tables same as how PE works, find a stock file if u dont have one and go back to that if its closer to 1.0
    Thank you very much for the info, I see what you are talking about. Believe it or not, those tables are the same as the as found. But I'm going to take your advise and bring them much closer to one. I probably haven't turned this pig over 4k since I started this, been afraid to turn it much with tune being so terrible.

  11. #11
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    Quote Originally Posted by NotSure View Post
    Larry, did you ever change your injector data when you changed injectors? If you are turbo, I doubt your stock injectors are going to keep up. What 07GTS said, that VVE is going to go dangerously lean into boost. Put it back in full MAF until you get the VVE dialed in. Also, your high and low octane charts are the same, this is bad.
    I did have the injector data in for the 1,000 cc injectors. I switched back to the stock injectors and data because of it being so rich. I had decided to take it back to as stock as possible and start over. No telling about the spark, I promise I'll fix it when I get fueling going my way. And I'll be damned careful in the meantime.
    I was thinking I'd run vve till around 2500 then MAF, what do ya'll think?

  12. #12
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    u have to tune the vve anyway or at least make it closer to what it should be, if ur using the maf then u can log the right pids and get an idea of how the vve is populating and fill it out so its close, should run fine on the 1000cc with your ecu will just need the right adjustments, try this for the OL tables and i changed the ITT table to be closer for the 1000cc also, idle spark is a little odd stepped like that, if the OL tables are too lean when cold just raise it up little where it needs it
    Attached Files Attached Files

  13. #13
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    Awesome! I'll download it tonight and let you know what it does.

  14. #14
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    Nope
    Not much better. admittedly it did run long enough to warm up, but still 20-30 percent rich even with AFR commanded at 14.7

  15. #15
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    have u adjusted the VVE to correct for the error then see what its like next startup ? are u getting the fail maf code ? might need to get a log of the issue for us to look at

  16. #16
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    took some swings at the error and didnt seem to matter. I'll spend some more time with it tonight. Also I'll make sure it's setting the mAF error code. I had the lamp on 2nd error, I'll change it to 1st error and retest

  17. #17
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    try this it should fail maf properly and couple other small changes, log maf sensor state it should show failed when running
    Attached Files Attached Files

  18. #18
    I had a similar issue and what worked for me was reducing the OL P/N and Gas Gear table by 5% at a time until everything fell in line. Nothing else seemed to work.

  19. #19
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    03032021 current.hpl log file from tonight.
    Just Crazy Rich! Doesn't seem to matter what I do.

  20. #20
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    Quote Originally Posted by Larry Reed View Post
    03032021 current.hpl log file from tonight.
    Just Crazy Rich! Doesn't seem to matter what I do.
    It isn't entering closed loop at all. I'd start by re-enabling all of the upstream O2 diagnostics... There's a lot of things that need addressing in that file.