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| Hydra Chip 17-Position Chip The Power Hungry Performance Hydra Multi-Position Chip is the industry standard for the 7.3L! Redesigned from the ground up, the Hydra Chip provides Ford owners with a feature packed, high quality, and low cost alternative to other existing modules on the market today. |
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#1
Fri, December 31st, 2021, 02:13 PM
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You won't find a myriad of calibrations for either of those. You have "the preferred" set loaded. Is there a reason you are switching to the bypass mode? Like Bill stated, unless you're performing specific diagnostics or troubleshooting there is no reason to run the PCM's flashed calibration. If you need a "stock" setting, flash the chip with the TNAA4S2 "0S" calibration and use it....it won't cause the hiccup.
Also running a calibration on the chip other than TNAA5S8 (provided your original VDH4 PCM hasn't been reflashed) will cause the same stall/stutter you're currently getting.
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Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years. Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim. 
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#2
Tue, January 4th, 2022, 04:54 PM
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Sorry, just got around to checking the PCM. PCM shows running TNAA5S8. I double checked and all my tunes are TNAA4S2. The question was prompted due to me coming across the issue when I was getting familiar with the chip. I wasn't doing any specific troubleshooting, just wondered how it operated switching on the fly vs key switched, etc. All is good. Thanks again!
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Hybrid Mode
