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Using the GM flex fuel sensor on an Fbody

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Old 12-11-2022, 07:51 AM
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Originally Posted by NewOrleansLT1
I have a ‘02 Tahoe flex fuel file in an F body 411 PCM and now my A/C has stopped working.. Is there a way to fix this in the tune? Thanks!!
I'm sure it's not the only thing that doesn't work too right? The P411 Tahoe file is the worst OS for the F-Body. Go P59.
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Old 12-11-2022, 10:15 AM
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What does the tune have to do with the A/C not working?
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Old 12-11-2022, 11:01 AM
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Originally Posted by 01CamaroSSTx
What does the tune have to do with the A/C not working?
The PCM controls the ac clutch. Wrong ac settings prevent it from working.
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Old 12-11-2022, 02:52 PM
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Originally Posted by Fast355
The PCM controls the ac clutch. Wrong ac settings prevent it from working.
Is there something in HP tuners I can refer my tuner to do?
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Old 12-11-2022, 02:55 PM
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Originally Posted by Guillaume Malaquin
I'm sure it's not the only thing that doesn't work too right? The P411 Tahoe file is the worst OS for the F-Body. Go P59.
It’s not that simple swapping to a P59 with an LT1 car. The car is running fine tho, besides the A/C. It’s a 1994 Z28 using the plug and play Torque Head kit..
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Old 12-11-2022, 07:11 PM
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Originally Posted by NewOrleansLT1
It’s not that simple swapping to a P59 with an LT1 car. The car is running fine tho, besides the A/C. It’s a 1994 Z28 using the plug and play Torque Head kit..
I had to go from the 2005 GMT800 system and thus A/C segment to a 2005 Van system and a/c segment to make the ac work in my P59 run 1997 Express. Both are analog input setups.
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Old 12-16-2022, 07:22 PM
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Originally Posted by Fast355
I had to go from the 2005 GMT800 system and thus A/C segment to a 2005 Van system and a/c segment to make the ac work in my P59 run 1997 Express. Both are analog input setups.
Got it working today thanks!!
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Old 12-18-2022, 10:19 AM
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Originally Posted by NewOrleansLT1
Got it working today thanks!!
System segment swap or were you able to swap the ac type setting?
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Old 02-25-2023, 06:25 AM
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Holy crap what a big read. I have a 2000 fbody t56 DBC I just want to run flex fuel, not worried about boost ill go holley eventually. What's needed to run flex fuel while retaining my a/c, cruise and whatnot?
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Old 02-25-2023, 08:23 AM
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Originally Posted by Fast355
System segment swap or were you able to swap the ac type setting?
Changed the ac type setting
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Old 02-25-2023, 08:28 AM
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Originally Posted by cburb88
Holy crap what a big read. I have a 2000 fbody t56 DBC I just want to run flex fuel, not worried about boost ill go holley eventually. What's needed to run flex fuel while retaining my a/c, cruise and whatnot?
Since you have a 2000 you can get the Tahoe OS uploaded, add flex sensor and change the AC setting. If you want the cruise to work also I think you need to P59 swap with the ‘04 GTO operating system. I ripped my cruise out so it wasn’t needed.
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Old 02-25-2023, 09:27 AM
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Originally Posted by NewOrleansLT1
Since you have a 2000 you can get the Tahoe OS uploaded, add flex sensor and change the AC setting. If you want the cruise to work also I think you need to P59 swap with the ‘04 GTO operating system. I ripped my cruise out so it wasn’t needed.
The Tahoe OS is the worst OS for that purpose.

Don't listen to that. Use a P59 PCM, add a E85 sensor, 2004 Hummer H2 603 OS (the best for f-body, because only the ASR doesn't work instead of everything), and segment swap the Fuel segment with a 2004 Tahoe Flexfuel. Tune it with your stock data/modded data.
That's it.
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Old 02-26-2023, 11:38 PM
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Originally Posted by Guillaume Malaquin
The Tahoe OS is the worst OS for that purpose.

Don't listen to that. Use a P59 PCM, add a E85 sensor, 2004 Hummer H2 603 OS (the best for f-body, because only the ASR doesn't work instead of everything), and segment swap the Fuel segment with a 2004 Tahoe Flexfuel. Tune it with your stock data/modded data.
That's it.
alright well I guess I gota decide if I feel like doing all this and buying a p59 now when i plan on doing a holley terminator soon anyways. Might be pointless 🤣
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Old 02-27-2023, 12:55 AM
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Originally Posted by Guillaume Malaquin
The Tahoe OS is the worst OS for that purpose.

Don't listen to that. Use a P59 PCM, add a E85 sensor, 2004 Hummer H2 603 OS (the best for f-body, because only the ASR doesn't work instead of everything), and segment swap the Fuel segment with a 2004 Tahoe Flexfuel. Tune it with your stock data/modded data.
That's it.
Need to make sure you get a P59 with the IAC chip. Also one could use PCMHammer with Tunerpro to turn on flex fuel, no need to segment swap.
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