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Thread: 2017 silverado lv3 4.3 throttle closing??

  1. #1
    Potential Tuner
    Join Date
    Mar 2025
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    2017 silverado lv3 4.3 throttle closing??

    This truck has the truck norris jr cam. The truck runs and drives very well except wot, ive noticed the tb will open 100% then close down to 64%. Rule of thumb is to check the tq limits,so i raised them and dd significantly over about 10 revisions to chase this issue down and nothing helps. Do these ecu's limit the throttle when the pusle width raises??
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  2. #2
    I know the VVE plays a role in torque calculations; looks like below 4000 RPM your VE Airflow is a fair bit lower than your MAF Airflow (believe above 4000 RPM is typical when the ECU favors the MAF over the VVE table/MAP sensor?). I'd try getting the VVE dialed in better using LTFT + STFT so the VE Airflow is closer to the MAF (assuming the MAF is accurate) and see what happens.