Filled with E85 without tune, now using regular 91 and the car stalls sometimes....

[000Camus000]

Hello,

I have this GT'18 (2800 miles), went with the frenzy and filled the tank (full) with E85 (without a tune), drove it a couple days, went to the Dragstrip and ended up with an empty tank, so I refueled (full tank again) with 91.

Everything was great until I was commuting in the freeway, saw some traffic ahead and put neutral to coast and slow down when I noticed 0 rpm, the engine was off. So I quickly turned the engine again but a wrench icon appeared on the dashboard. Once at home I let the car rest for some minutes, when I turned it on again the wrench icon was gone, the car felt normal, but again when cruising, going from sixth gear to neutral the rpm drop to 540, then 340, then 0.

I know it has to do with the gas change. It only happened me two times, after that the car seems to be more stable, maybe the ECU is readjusting to the normal ratio for ethanol. What do you think?

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[JennyStang]

Hello,

I have this GT'18 (2800 miles), went with the frenzy and filled the tank (full) with E85 (without a tune), drove it a couple days, went to the Dragstrip and ended up with an empty tank, so I refueled (full tank again) with 91.

Everything was great until I was commuting in the freeway, saw some traffic ahead and put neutral to coast and slow down when I noticed 0 rpm, the engine was off. So I quickly turned the engine again but a wrench icon appeared on the dashboard. Once at home I let the car rest for some minutes, when I turned it on again the wrench icon was gone, the car felt normal, but again when cruising, going from sixth gear to neutral the rpm drop to 540, then 340, then 0.

I know it has to do with the gas change. It only happened me two times, after that the car seems to be more stable, maybe the ECU is readjusting to the normal ratio for ethanol. What do you think?

Hmmm e85 with out a tune Hahahahahaha

 

[BadGTR]

Why would you put e85 with out the car being tuned for it?

 

[000Camus000]

Yeah, as I said wasn't the smartest decision, wanted to see if would be any difference, and in fact didn't noticed anything, even the A/F ratio was the same, I monitor these values and was around 13 at WOT, 14 ~ 15 cruising, 29+ coasting, so I didn't noticed the engine on the lean spectrum while running.

I need to note that this was from a flex fuel pump and I had 1/4 of 91 regular gas on the tank at the time.

 

[BlueThunder]

https://www.mustang6g.com/forums/th...tock-fuel-capable-of-e85.107395/#post-2313061

Bottom left.

 

[JOKER M1]

Sounds like you may have noticed a difference, just not the one you were expecting. Good luck and keep us informed.

Yeah, as I said wasn't the smartest decision, wanted to see if would be any difference, and in fact didn't noticed anything, even the A/F ratio was the same, I monitor these values and was around 13 at WOT, 14 ~ 15 cruising, 29+ coasting, so I didn't noticed the engine on the lean spectrum while running.

I need to note that this was from a flex fuel pump and I had 1/4 of 91 regular gas on the tank at the time.

 

[000Camus000]

https://www.mustang6g.com/forums/th...tock-fuel-capable-of-e85.107395/#post-2313061

Bottom left.

Yeah, I saw that today looking for info, but I guess that also counts for E85 with tune, I don't think the Dealer would be fine with that either.

Sounds like you may have noticed a difference, just not the one you were expecting. Good luck and keep us informed.

That's right, what I mean is that during the time the car had the E85 (or E50, it already had 1/4 of 91 that it's E15), didn't noticed anything until now. What I am going to do is disconnecting the battery to clear up the ECU, then drive normally and hope the issue doesn't come back, otherwise I may need to bring it to the Dealership. But yeah, I'll keep the post updated, I am sure I won't be the only fool to use E85 without a tune.

And I mean, what could be the very worst scenario? Like the timing a little more advanced than it should be, maybe to dangerous levels where piston meets valve? The car feels fine and hard, doesn't tick or knock that I notice. But anyway, let's see.

Thanks.

 

[BlueThunder]

I'm not sure if they can tell, but I'd get as much regular gas through it as possible before taking it to a dealer and don't mention any of this.

 

[JennyStang]

I am sure I won't be the only fool to use E85 without a tune.

I’m sure your the only person

 

[stang1971]

You should try Diesel Fuel next..... It TRIPLES the torque the motor puts out!!!!

 

[JennyStang]

You should try Diesel Fuel next..... It TRIPLES the torque the motor puts out!!!!

Dead

 

[Plimmer]

Just let it idle for awhile to relearn the fuel trims of 91,

 

[000Camus000]

Just let it idle for awhile to relearn the fuel trims of 91,

Thanks, I'll try that!

 

[F1scamp]

Wow. This is painful to read. Those a/f ratios on e85, taking to dragstrip, valve to piston, timing too advanced......

When they tell you that you need a motor, open your wallet, pay it, fix it, buy a prius.

 

[AZ18yote]

If you don't have a handheld to do a KAM reset you can try disconnecting the negative term from the battery and letting it sit for about 30 minutes, with head lights turned to on to drain any current.

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