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  1. 02-15-2024 #1
    2000 Silverado
    2000 Silverado is offline
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    How to retard timing?

    I have a HP tuned computer (OS 12205612); I have found a XDF file that matches OS 12205612. The guy that programmed for me says he advanced the timing 3 and 4 degrees across the board. I have to run 93 plus octane booster in to keep from holding back. Fuel trims look fine, I don't think fuel is the problem.

    All I want to do is retard the timing, so I don't have to mess with the BOOSTANE and MMT from the booster that junks my plugs up after time. I'm not sure how to retard the timing with TunerPro, I'm new at this? Truck has 4.8, 2,500 torque converter, camshaft with bigger injectors. If anybody can help, thanks.
    Last edited by 2000 Silverado; 02-15-2024 at 04:17 PM.
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