E85 sensor kit removal question

lt4camaro · 11-05-2023, 02:42 PM

I am removing my E85 sensor kit that I installed, am returning the car to stock status. Will I have any CEL issues ? do I have to deactivate the E85 tables? I had Jannetty activate and set up the car for E85 originally after I successfully installed and wired the E85 sensor kit.

KingLT1 · 11-05-2023, 04:48 PM

Depends if flex fuel diagnostics is enabled.

lt4camaro · 11-05-2023, 05:48 PM

Quote:

Originally Posted by KingLT1

Depends if flex fuel diagnostics is enabled.

Thanks King, but not sure what you mean. Are you saying when Jannetty enabled E85 and tuned the car on E85 and enabled flex fuel diagnostics, I will have issues and flex fuel diagnostics will have to be disabled?

Megahurtz · 11-05-2023, 06:51 PM

That is exactly what he is saying

lt4camaro · 11-06-2023, 07:48 AM

Quote:

Originally Posted by Megahurtz

That is exactly what he is saying

Thank you.

Megahurtz · 11-06-2023, 10:58 AM

The problem with removing the Flex Fuel sensor on a car where it was tuned in, is if the diagnostics are enabled(and maybe even if they are not), you will get a CEL for FF sensor failure. Then the ECU will lock in on a default ethanol content as part of the failure strategy. I think the OEM value is 40% Ethanol. So if you pull the flex fuel sensor and put 93 octane in, the ECU will treat it like E40 and run super rich.

The tune needs to be removed. I would think most tuners would flash the stock file back in for free in your situation. At least I would.

lt4camaro · 11-06-2023, 11:04 AM

Quote:

Originally Posted by Megahurtz

The problem with removing the Flex Fuel sensor on a car where it was tuned in, is if the diagnostics are enabled(and maybe even if they are not), you will get a CEL for FF sensor failure. Then the ECU will lock in on a default ethanol content as part of the failure strategy. I think the OEM value is 40% Ethanol. So if you pull the flex fuel sensor and put 93 octane in, the ECU will treat it like E40 and run super rich.

The tune needs to be removed. I would think most tuners would flash the stock file back in for free in your situation. At least I would.

Well thank you for that, it certainly puts that into a perspective I can understand.

11-05-2023, 02:42 PM	#1
lt4camaro Drives: 2021 LT1 10 speed auto Join Date: May 2013 Location: Connecticut Posts: 2,343	E85 sensor kit removal question I am removing my E85 sensor kit that I installed, am returning the car to stock status. Will I have any CEL issues ? do I have to deactivate the E85 tables? I had Jannetty activate and set up the car for E85 originally after I successfully installed and wired the E85 sensor kit.

11-05-2023, 04:48 PM	#2
KingLT1 Drives: 2016 1SS NFG A8 Join Date: Aug 2017 Location: 46804 Posts: 6,810	Depends if flex fuel diagnostics is enabled. __________________ 2016 NFG 1SS A8 Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA

11-05-2023, 06:51 PM	#4
Megahurtz Snackbar Tuning Drives: 2023 SGM ZL1 Join Date: Oct 2016 Location: Florida Posts: 1,132	That is exactly what he is saying

11-06-2023, 10:58 AM	#6
Megahurtz Snackbar Tuning Drives: 2023 SGM ZL1 Join Date: Oct 2016 Location: Florida Posts: 1,132	The problem with removing the Flex Fuel sensor on a car where it was tuned in, is if the diagnostics are enabled(and maybe even if they are not), you will get a CEL for FF sensor failure. Then the ECU will lock in on a default ethanol content as part of the failure strategy. I think the OEM value is 40% Ethanol. So if you pull the flex fuel sensor and put 93 octane in, the ECU will treat it like E40 and run super rich. The tune needs to be removed. I would think most tuners would flash the stock file back in for free in your situation. At least I would.

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