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Old 06-27-2022, 06:08 PM   #1
chondo
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Car broke down unsure why- e85 oft

Hey all, hoping I can get some insight not sure what happened here.

Have been running the stock e85 tune with oft on stock 2018 brz for a couple years without issue. A week ago I got an oil change and state inspection at a local shop.

2 days later Drove it a few miles then tried to floor it and it stops accelerating and turns off. Tried starting it a couple times and car shakes for a bit and turns off (like choking?). Checked Fluids and all looked good from what I can tell.

Had the oft tablet with me and it showed no cel codes and the same e85 tune was loaded. ReRan the same tune and it started up, chokes a bit but gave it some gas and it settled down. Has worked fine ever since.

The shop said they only read the ecu for errors and donít make any changes. Could the tune have gotten corrupted somehow and was fixed when I reloaded it? Should I post logs (noticed no issues since)? I didnít take it back to the shop yet, should I?

Timeline/cliffs
ó tuned to e85 from regular gas on the previous fill up
ó 30 miles on current fillup (filled from same pump as previous)
ó get oil change and inspection
ó ~10 miles later car breaks down when flooring it
ó ran same oft e85 tune that was already loaded
ó no issues for week and a half normal and hard driving ~100 miles
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Old 06-28-2022, 02:08 AM   #2
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I'd suggest posting a log with datazap. It may highlight an issue.
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Old 06-28-2022, 08:20 AM   #3
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Wont be tune issue if it ran for ages before


might be fuel issue


if the tune get corrupted in ecu which is extremly unlikely the car wont even start. the ecu check the tune checksum every startup if its incorrect no start
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Old 06-28-2022, 03:23 PM   #4
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Thanks for the responses. Here's a log I captured today. datazap log

other info from the incident: The e85 pump states 70% minimum ethanol. I didn't monitor with the oft after filling up but took it easy for a few miles. I remember flooring it in 2nd gear up to about 5.5-6k rpm then shifting to 3rd and then it stopped accelerating. engine light flashed and I pulled over and it shut down. It would start up again but the RPM would fluctuate a lot then turn itself off 1-2 seconds after.

was also 100 degrees F and think I saw steam when I opened the hood. some water leaking on the ground probably from the AC.
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Old 06-28-2022, 06:23 PM   #5
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Originally Posted by chondo View Post
Thanks for the responses. Here's a log I captured today. datazap log

other info from the incident: The e85 pump states 70% minimum ethanol. I didn't monitor with the oft after filling up but took it easy for a few miles. I remember flooring it in 2nd gear up to about 5.5-6k rpm then shifting to 3rd and then it stopped accelerating. engine light flashed and I pulled over and it shut down. It would start up again but the RPM would fluctuate a lot then turn itself off 1-2 seconds after.

was also 100 degrees F and think I saw steam when I opened the hood. some water leaking on the ground probably from the AC.

Check engine light flashing is usually misfires, they can be due to fuel or spark issues.


log looks ok nothing major.


ususual for you to see steam under hood, check coolant again.



a/c drain shouldnt get into engine bay
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Old 07-02-2022, 09:28 PM   #6
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They might have disconnected the battery and the ecu is calibrating itself. The rom file was updated to 4.0 something awhile back too. I would check to see if your running the current version just to be sure.
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Old 07-03-2022, 08:26 AM   #7
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They might have disconnected the battery and the ecu is calibrating itself. The rom file was updated to 4.0 something awhile back too. I would check to see if your running the current version just to be sure.
I’d say it’s that,

I reflashed to a different e85 tune and during the relearn process, after a short drive to the shops my car wouldn’t start. Would crank then immediately stall out and die. I could keep it running if I gave it gas but would die immediately after I took my foot off. I reflashed to my old tune which was still shaky at first but got me home and then settled, no issues since.

The re-learn process seems pretty hit or miss with e85 tunes in my experience
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Old 07-08-2022, 02:50 PM   #8
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Iíd say itís that,

I reflashed to a different e85 tune and during the relearn process, after a short drive to the shops my car wouldnít start. Would crank then immediately stall out and die. I could keep it running if I gave it gas but would die immediately after I took my foot off. I reflashed to my old tune which was still shaky at first but got me home and then settled, no issues since.

The re-learn process seems pretty hit or miss with e85 tunes in my experience
Yeah this sounds similar to what happened. Shop did test the battery so I guess ecu had to recalibrate. No issues since so Iím calling it good
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