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Thread: 4.8L Goes Lean in Gear in Idle

  1. #1
    Potential Tuner
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    Aug 2020
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    4.8L Goes Lean in Gear in Idle

    Somewhat new to Tuning, Have a 2000 Silverado 4.8L Stock Head and block, Pro LS Vortec Truck Swap Camshaft 222/231 112lobe +5adv 1.7.1 LS6 rockers and spring. Performance EFI Fabricated Intake Manifold with Fuel Rails and Throttle Body 15? Throttle Opening 102mm throttle body. 44lb injector set at 58psi return system Injector table loaded in Tune. Recalibrated the MAF down to 1% Error except in the drive in gear as it goes lean AFR 28%. in idle P/N Wideband AFR reads 14.8 to 15.0. Under able to adjust VE as it has no affect on the lean in idle.

    Drive great pulls strong even on stock timing. Just can't stop it from going lean. If I park / brake and accel to about 2% TPS It trims down to 14.8 14.9 but KPA is about 89 t 90. looking for any insight to what table is causing this concern. 9_15 Lean in Gear.hpl

  2. #2
    What injectors are they? What data do you have for the injector set?

  3. #3
    Potential Tuner
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    Aug 2020
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    They are Deatschwerks attached is the Injector data file
    Attached Files Attached Files

  4. #4
    Tuning Addict 5FDP's Avatar
    Join Date
    May 2012
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    Rogers, MN
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    13,533
    Post your tune.
    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.

  5. #5
    Potential Tuner
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    Attached dis the tune file.

  6. #6
    Potential Tuner
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    Aug 2020
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    Went for another drive tried adjusting the idle and throttle plate some resetting the TPs and IAC, No improvement when going to as stop in gear. Relearned the MAF one more time, runs get, idles in neutral great but when placed in gear it goes vert lean. 28AFR. let off the brake a little and it jumps into normal AFR range momentarily hold it off idle brake with Brake and accel and it some what normal AFR range.

    Have not done VE tuning, timing, or idle tuning yet. looking to get it idling in gear first, not sure what table is playing me that requires the IAC to go to 400 and added 40 plus gram of air while in gear in idle.

    I am attaching the last tune and the test drive files

    Any suggestions are welcome!