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  1. Replies
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    1,345

    You're running a bit rich. The partly burnt fuel...

    You're running a bit rich. The partly burnt fuel builds up in the exhaust and then when you lay the boot into it, the high exhaust flow blows all that built up shit out of the exhaust. If you then...
  2. Unusual problem. Good that you found it.

    Unusual problem. Good that you found it.
  3. What steps have you taken to identify the cause...

    What steps have you taken to identify the cause of the problem?
  4. You've got a serious problem with lean tip in and...

    You've got a serious problem with lean tip in and rich tip out. Fix that first and then you'll get a clearer picture of what's happening with your overall fueling.
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    Merry Christmas. :cheers:

    Merry Christmas. :cheers:
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    10,016

    They don't have data because they're cheap crappy...

    They don't have data because they're cheap crappy chinese injectors and they all flow differently. Read reviews on other sites and you'll see people with dead injectors out of the box, injectors that...
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    1,606

    When you run in closed loop, you need to have...

    When you run in closed loop, you need to have working cats.

    Either install cats or learn to live with the rich smell. The only other option is to run full time open loop, but I would not...
  8. Wrong. Ahhh, now there's your problem......

    Wrong.



    Ahhh, now there's your problem... IAT.

    GM knew that they had a problem with heat soak in the IAT sensor, so they 'bent' the airflow calculations to reduce the heat soak effect. The...
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    5,993

    Sounds like you still don't know how much trouble...

    Sounds like you still don't know how much trouble you're causing yourself. Those are the WORST injector ever made. I've seen huge bank to bank imbalances with those injectors... impossible to dial...
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    2,379

    Try running in MAF only mode and see if it still...

    Try running in MAF only mode and see if it still does it.
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    2,379

    Does that vehicle have a MAF sensor fitted?

    Does that vehicle have a MAF sensor fitted?
  12. Short answer... YES! Longer answer.... YES,...

    Short answer... YES!

    Longer answer.... YES, the VE will always move around. You can get it better but it will never be what I would call good. Even if you don't want to run a MAF... I would...
  13. Swap the injectors bank to bank. If the high...

    Swap the injectors bank to bank. If the high trims follow the injectors, then it's an injector problem. If the high trims stay on the same bank, then it's an airflow problem.
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    1,080

    V7.5 no longer supports installation to Windows...

    V7.5 no longer supports installation to Windows XP or Windows Vista. This change is due to SHA1 having been deprecated by digital certificate authorities.

    V7.5 and V8 are now only supported on...
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    Did you fix the problem?

    Did you fix the problem?
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    1,661

    I never said your cam was too aggressive. I just...

    I never said your cam was too aggressive. I just said that it's not going to have much torque at low rpm. If you can keep the revs over 3000 as you're pulling up your driveway, the engine shouldn't...
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    1,661

    Yep, it's your cam.... it's too big for low rpm...

    Yep, it's your cam.... it's too big for low rpm driving. The bigger the cam, the more torque you sacrifice at low rpm. For a good all-rounder, try something like a 218/224 on a 116 or 117LSA. It'll...
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    8,975

    Check your O2 sensor heater circuit.

    Check your O2 sensor heater circuit.
  19. Replies
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    18,317

    You can tune out a voltage discrepancy as long as...

    You can tune out a voltage discrepancy as long as it's a constant discrepancy... my main concern is that your charging system is not working properly.



    If you're confident that the charging...
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    6,460

    I came across this problem once a few years...

    I came across this problem once a few years ago... was a corrupted OS. If you've got an old version of your tune that you know is good, then full flash in that old file and see if the trims are still...
  21. What have you tried?

    What have you tried?
  22. Is this the same vehicle you were having return...

    Is this the same vehicle you were having return to idle issues with a couple of years ago?
  23. Replies
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    18,317

    I run my own vehicle permanently in MAF only...

    I run my own vehicle permanently in MAF only mode. I just have my VE table close in case I ever have a MAF failure, but I don't spend too much time adjusting it.

    The MAF is a sensor that measures...
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    It has to be in MAF only mode for CalcVET... but...

    It has to be in MAF only mode for CalcVET... but I think you now understand why.

    Yeah, I like DFCO disabled for tuning... it's a lot easier to work on fueling when the fueling is working.



    ...
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    18,317

    Did you switch the tune over to MAF only mode to...

    Did you switch the tune over to MAF only mode to do that log?
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