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Old 04-08-2021, 10:29 PM   #1
kev0
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Can an Ecutek tune influence what flex fuel gauge reads?

My tuner is off the clock otherwise I would have asked him but I'll ask you guys in the mean time. Can a tune influence what a flex fuel sensor will read? I switched tuners and I got the green light to go E85. I filled up 10.5 gallons of E85 and drove 10 miles but my FF gauge never changed. It only fluctuated between E10 and E11 ever since I went back to pump gas.

Car still drove fine although the fuel trims are a bit lean. This isn't a faulty gauge, is it? It worked for the past 15k miles before I switched tuners but now it isn't updating with the new tune.

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Old 04-08-2021, 10:48 PM   #2
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My tuner is off the clock otherwise I would have asked him but I'll ask you guys in the mean time. Can a tune influence what a flex fuel sensor will read? I switched tuners and I got the green light to go E85. I filled up 10.5 gallons of E85 and drove 10 miles but my FF gauge never changed. It only fluctuated between E10 and E11 ever since I went back to pump gas.

Car still drove fine although the fuel trims are a bit lean. This isn't a faulty gauge, is it? It worked for the past 15k miles before I switched tuners but now it isn't updating with the new tune.
Zeitronix flex fuel analyzer and stand alone gauge?
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Old 04-08-2021, 10:54 PM   #3
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Zeitronix flex fuel analyzer and stand alone gauge?


Zeitronix. It's Xero Limit's Flex Fuel Kit that utilizes the rear o2 sensor.

Such a weird issue.
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Old 04-08-2021, 11:05 PM   #4
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Zeitronix. It's Xero Limit's Flex Fuel Kit that utilizes the rear o2 sensor.

Such a weird issue.

Same here, but mine is Visconti's version. My gauge worked just fine reading about 10% before my CSG flex fuel tune using EcuTek to flash it, and is working properly afterwards reading about 80%.

The tune should not affect your gauge at all. The tune however can be adjusted to change how the ECU reads and interprets the data and when you data log, you can see that value, but this would not in any way affect what your stand alone gauge will read.

Pick up one of those inexpensive ethanol test kits to check the actual amount of ethanol to gasoline to make sure the pump is actually giving you what you're paying for.
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Old 04-08-2021, 11:08 PM   #5
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Ok. Might be a coincidence that it just so started to have problems then. I've been going to the same E85 station I have been visiting for the past 11 months. 10.5 gallons of E85 and my E% didn't rise up one bit. Let's see what Zach has to say

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Old 04-08-2021, 11:13 PM   #6
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Ok. Might be a coincidence that it just so started to have problems then. I've been going to the same E85 station I have been visiting for the past 11 months. 10.5 gallons of E85 and my E% didn't rise up one bit. Let's see what Zach has to say


Zach tuned mine as well. It's quite possible, however unlikely that your ethanol content sensor in the fuel line has gone bad. Or it's possible that you got a bit of water in the tank and is affecting the sensor output.
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Old 04-08-2021, 11:14 PM   #7
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What does the ethanol content read when you data log with EcuTek?
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Old 04-08-2021, 11:37 PM   #8
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all flex kts ive seen with separate guages the; guage is driven off a separate circuit to the signal circuot to ecu


log what the ecu is seeing a flex fuel percent in ecutek see if it same as guage reads


if so then likely issue with flex kit electronics.



if both read same then maybe flex sensor is bad
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Old 04-08-2021, 11:45 PM   #9
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all flex kts ive seen with separate guages the; guage is driven off a separate circuit to the signal circuot to ecu


log what the ecu is seeing a flex fuel percent in ecutek see if it same as guage reads


if so then likely issue with flex kit electronics.



if both read same then maybe flex sensor is bad
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What does the ethanol content read when you data log with EcuTek?


Surprisingly enough, the ECU is reading exactly what the gauge reads! 11.xx%. It's just problem after problem with my car. Ughh.
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Old 04-08-2021, 11:56 PM   #10
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Surprisingly enough, the ECU is reading exactly what the gauge reads! 11.xx%. It's just problem after problem with my car. Ughh.

Definitely test the ethanol content of the fuel before going any further. Both the gauge and what the ECU is reading seem to coincide with about 11% ethanol.
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Old 04-09-2021, 12:04 AM   #11
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you need to assure the scaling for flex sensor written in ecutek tune is good for your sensor
And the result must then coincide with the gauge reading

some tuners (i do for example) can out 10 or 11% as the default fixed ethanol percentage for when the flex kit is not working/faulty

the flex fuel programming and its scaling is only as good as the tuner implements it
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Old 04-09-2021, 12:14 AM   #12
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you need to assure the scaling for flex sensor written in ecutek tune is good for your sensor
And the result must then coincide with the gauge reading

some tuners (i do for example) can out 10 or 11% as the default fixed ethanol percentage for when the flex kit is not working/faulty

the flex fuel programming and its scaling is only as good as the tuner implements it
Ok, so in your opinion, do you think the tuner intentionally set it to 10-11% for the first E85 log he wants me to do? Maybe he did it so he can ensure that it is safe?
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Old 04-09-2021, 12:16 AM   #13
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i m not in your tuner's head and need a log to look at possibily with a cold start and all the Flex values ticked in in ecutek for logging

would be very stupid to put fix 11% for flex, even if you put e85
so no i do not think so

the fixed value i was talking about is forced by ecutek if the flex sensor gets faulty basically
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Old 04-09-2021, 12:24 AM   #14
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Ok, so in your opinion, do you think the tuner intentionally set it to 10-11% for the first E85 log he wants me to do? Maybe he did it so he can ensure that it is safe?

Knowing how Zach works, you've flashed between 5 and 8 calibrations for this tune already. If he told you you were ready to fill up with flex fuel, the tune is not going to be set to a certain ethanol percentage.

Your gauge reads 11%, your log reads 11%. I am willing to bet that there's 11% ethanol content in your tank right now.

Test your fuel.

EDIT: If the test comes out as a different % there is something wrong with either your sensor, your ethanol content analyzer (the Zeitronix box) or there's water in your fuel.
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