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Startibilty Issues- Flex Fuel - Reading 85% Ethanol

Discussion in '2nd Gen Tundras (2007-2013)' started by Jeffro22, Dec 1, 2022.

  1. Dec 1, 2022 at 10:04 AM
    #1
    Jeffro22

    Jeffro22 [OP] New Member

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    Truck started having really bad starting issues over the past few weeks. ALmost happening every morning. Takes 3 full key cycles/cranks before it actually starts. Runs rough for a few seconds and blows some smoke and then seems normal. Starts fine the rest of the day

    Checked the Ethanol reading with my scanner and its reading 85.1%

    It did this last year, but maybe only 2-3 times total.

    What's the latest on the fix? Is the dealer flash still just a temporary fix?

    Should I look at swapping fuel pump and possibly doing the mod to bypass the flexfuel/low pressure return at the switch valve?
     
  2. Dec 4, 2022 at 8:23 PM
    #2
    BozickA88

    BozickA88 New Member

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    Most recent fix is fuel pump and update. T-SB-0166-19
     
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  3. Dec 6, 2022 at 6:46 PM
    #3
    Jeffro22

    Jeffro22 [OP] New Member

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    Thanks. Guess I Will plan to take to dealer. Will let you know how it goes
     
  4. Dec 6, 2022 at 7:36 PM
    #4
    texmln

    texmln New Member

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    Just buy the $30 software on Ebay and reset it yourself. Every time I had it to the dealer for the fix the problem came back. No surprise since they jacked me for $150 each time. Since I reset it myself it's never happened again but I still have the software if I ever need it.
     
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    #4
    Jeffro22[OP] and Skew12 like this.
  5. Dec 7, 2022 at 3:56 AM
    #5
    Jeffro22

    Jeffro22 [OP] New Member

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    Do you have any more info on this or a link? Would like to give it a try
     
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    #5
  6. Dec 8, 2022 at 8:22 AM
    #6
    Jeffro22

    Jeffro22 [OP] New Member

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    Thanks ! ordered the techstream- Will update once I receive it
     
  7. Dec 13, 2022 at 2:54 PM
    #7
    Nufaze

    Nufaze New Member

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    6" lift, 35's, CAI, Flowmaster super 40 exhaust
    What is the software needed?
     
  8. Dec 22, 2022 at 11:01 AM
    #8
    Jeffro22

    Jeffro22 [OP] New Member

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    You can find on ebay or Amazon. Tech Stream - search
    OBD2 Diagnostic Cable for Toyota Lexus Scion or

    https://www.ebay.com/itm/403927130010

    thanks, took me a little while to get my laptop situation figured out. Ended up using a newer laptop with virtual box. Got my ethanol reset to 0%. Will continue to monitor but truck starts and idles a lot smoother. Hate I waited so long
     
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  9. Dec 25, 2022 at 5:31 PM
    #9
    Jeffro22

    Jeffro22 [OP] New Member

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    So far so good. Put about 700 miles on it since reset

    just checked and it’s reading 1.2%ethanol.

    Truck is starting perfect and seems to be running smoother
     
  10. Dec 25, 2022 at 6:55 PM
    #10
    texmln

    texmln New Member

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    Glad it worked out for you.
     
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  11. Dec 26, 2022 at 2:46 PM
    #11
    Jeffro22

    Jeffro22 [OP] New Member

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    Yeah, Thanks for turning me onto it.

    Used it today to program my spare key I bought off Amazon
     
  12. Dec 29, 2022 at 2:46 PM
    #12
    CTB Mike

    CTB Mike It's RED? My rods and cones must be screwed up!

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    Sorry you're having this problem, but this is why I would never own a Flex Fuel vehicle of any kind.
     
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  13. Dec 30, 2022 at 10:16 AM
    #13
    Jeffro22

    Jeffro22 [OP] New Member

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    Yeah. Didn’t research it it before I bought. Would definitely prefer to not have the ff but that really limits what you can find

    now that I have the alcohol density reset truck is running great. Especially considering it has 282k miles

    just wish I would have looked into re-setting it myself sooner. Was easy enough once I got software setup
     
    Skew12 and CTB Mike[QUOTED] like this.
  14. Jan 16, 2023 at 9:00 AM
    #14
    Jeffro22

    Jeffro22 [OP] New Member

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    just an update. Truck has been running great and no starting issues at all. I have been driving a bunch and have racked up about 5k miles since reset. Unfortunately my ethanol reading is creeping back up. I just checked and it was at 48% before a fill up and after fill up was reading between 55-60%

    Will plan to reset again and monitor. Not sure if I will eventually need to take it in to dealer and get re-flash of the computer also
     
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  15. Mar 1, 2023 at 9:05 AM
    #15
    Jeffro22

    Jeffro22 [OP] New Member

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    I have had to reset my density 3 times now since i first did it back in December. I have been driving a lot, but looks like it doesn't take very long to creep back up

    I checked this am it was at 54% . I can tell by the way the truck runs/sounds if the density is reading high. IT runs so much better when its at zero (or under 15%)

    Wish there was a permanent fix, but I guess i'll just plan to reset every month or so
     
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  16. Mar 24, 2023 at 9:50 AM
    #16
    swampmusic

    swampmusic New Member

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    Jeffro22 I’m having the same issue on my 2016 for the second time. Had the TSB done in 21 and now it’s back. No permanent fix that I can find. I ordered the Amazon cable and software to reset the density myself and cannot get it installed correct. Anyway you may be able to help?
     
  17. Mar 25, 2023 at 5:55 AM
    #17
    Jeffro22

    Jeffro22 [OP] New Member

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    I couldn’t get the software that I received with the cable to install either

    go search on Google Techstream in 5 minutes find and follow the instructions on IH8MUD think YouTube has some videos also
     
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  18. Mar 25, 2023 at 7:41 AM
    #18
    swampmusic

    swampmusic New Member

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    I tried that as well and can’t get the virtual box to work, it constantly says “aborted”. I am going to try uninstalling everything and starting over. After that I guess I’ll drop the $400 on a vf tuner. Thanks for the feedback.
     
  19. May 10, 2023 at 6:40 AM
    #19
    Jeffro22

    Jeffro22 [OP] New Member

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    reset mine again. 5/10/23 @289,877.. ethanol reading was up to 68.2%

    doesn't seem to be lasting long between resets. going to try to start logging readings, but guessing its only making it a couple thousand miles before reading is high
     
  20. May 10, 2023 at 11:25 PM
    #20
    OldGuy03

    OldGuy03 Still new here, but working on it

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  21. May 11, 2023 at 6:26 AM
    #21
    Jeffro22

    Jeffro22 [OP] New Member

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  22. May 12, 2023 at 2:36 PM
    #22
    OldGuy03

    OldGuy03 Still new here, but working on it

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    I guess that's the woes of flex fuel owners. I have yet to experience any issues yet, but assume eventually I will. Definitely one thing I didn't do my research on when upgrading my gen 1 to a gen 2. Other than this issue I know I'll still get 300k out of this rig before I pass it along though. I have that much faith and past experience in the Toyota brand. They just plain own my loyalty.
     
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  23. Jul 3, 2023 at 10:25 AM
    #23
    Jeffro22

    Jeffro22 [OP] New Member

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    Not making it very long before having to reset

    293,128 mileage - fuel density 76.1%
     
  24. Dec 14, 2023 at 7:20 AM
    #24
    Totmacher

    Totmacher New Member

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    So does it help any to once in a while run a full tank of ethanol-free gas through it or to use some kind of fuel additive?
     
  25. Mar 29, 2024 at 12:20 PM
    #25
    pablo89

    pablo89 New Member

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    having to reset about every week. and when I read my alcohol level ive been getting 0% not sure if im looking at the correct thing
     
  26. Mar 29, 2024 at 12:44 PM
    #26
    Totmacher

    Totmacher New Member

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    How high are long term fuel trims?
    On mine, trims and alcohol % readings were both high. There were 2 things i reset and then added 3 gallons fuel per the TSB instructions before starting/driving. No problem since. Took a while for numbers to stop fluctuating though. 3 tanks worth maybe.
     
  27. Apr 2, 2024 at 7:21 AM
    #27
    pablo89

    pablo89 New Member

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    so what did you reset all I reset was the alcohol density. my ft long have ranged between 7%-25% the times ive seen it sometimes less then 7%
     
  28. Apr 2, 2024 at 7:44 PM
    #28
    Totmacher

    Totmacher New Member

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    I did one called "learning value reset" and another called "fuel density learning value reset". Then added 3 gallons gas. Then started it and went on a long test drive.

    The adding gas is part of the TSB instruction that Toyota would do. I noticed first couple of fuel-ups after resetting the numbers fluctated a little so there must be something about adding gas that triggers the computer to take a reading.
    https://static.nhtsa.gov/odi/tsbs/2019/MC-10170730-9999.pdf
    Basically did steps 7-14 from that TSB except I used the other tool instead of Techstream.
     

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