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Thread: LS1 help

  1. #1
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    LS1 help

    Hello. I have a 98 Fbody. I cannot for the life of me, get this thing to idle. I have PRC LS6 2.5 heads. MS3 cam and a Fast 102 intake and TB. I have flashed this thing so much.



    98ws611 25 21 startup speed density 3.hptlayyyy.Channels.xml21-11-27 22-57-01.hpl

  2. #2
    Tuning Addict 5FDP's Avatar
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    Put that VE back to stock, it's drowning in fuel.

    The MAP sensor reads about 100kpa even when it's running for that little bit, that isn't right and isn't helping here.

    What MAP sensor is installed?
    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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    Its stock. Guess I will test it to see if its bad. Thanks

  4. #4
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    What injectors are you running? Do you have an exhaust system on the car?

  5. #5
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    No exhaust, open headers. And I'm frustrated and embarrassed to say, fast 85's.

  6. #6
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    Load this calibration file. It'll get you close. You won't be able to find data FAST injectors, but this will be closer than the 35 lb/hr injector data in your current tune.

    98ws611 25 21 startup speed density kw 1.hpt

  7. #7
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    Thank you sire. I can't figure out what I am missing. Also, grabbed a Standard Brands MAP from Oriellys while I was out today. It is installed, suggested.hpl98 suggested start.hpt
    Last edited by 98ws6; 11-28-2021 at 10:14 PM.

  8. #8
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    Quote Originally Posted by 98ws6 View Post
    Thank you sire. I can't figure out what I am missing. Also, grabbed a Standard Brands MAP from Oriellys while I was out today. It is installed, suggested.hpl98 suggested start.hpt
    Open up the throttle body minimum air screw by at least 1.5 turns.

  9. #9
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    The frustration mounts!!!! TPS wont relearn. Its showing 3,5 % I have tried relearning it at 2.0%, 1.5% wont change.12 1 no.hpl
    98 suggested start.hpt

  10. #10
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    Quote Originally Posted by 98ws6 View Post
    The frustration mounts!!!! TPS wont relearn. Its showing 3,5 % I have tried relearning it at 2.0%, 1.5% wont change.12 1 no.hpl
    98 suggested start.hpt
    You've opened up the TB blade just a little to far. The TPS is now at 0.92V at an idle position. That why it won't relearn. Just back off of the adjustment until you get the TPS voltage down to 0.78-0.80V and then it'll allow you to relearn the TPS.