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Old 01-30-2014, 06:14 PM   #1 (permalink)
DMW
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Default e85 back to pump

I've been on straight e85 for about 3 months now. I decided to switch back to pump gas, but my tank was just under 1/4 tank when I switched back. I reset the battery and loaded my pump gas tune back in.

Now I am getting very bad hesitation between 2k and 3k rpm. After that it seems to rev fine, but the air/fuel is on the lean side. I added WOT FUEL on my DSP, and it's about right now.

My question is could the 1/4 tank of e85 left in my tank be causing my hesitation problem?
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Old 01-30-2014, 06:36 PM   #2 (permalink)
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Quote: Originally Posted by DMW View Post
I've been on straight e85 for about 3 months now. I decided to switch back to pump gas, but my tank was just under 1/4 tank when I switched back. I reset the battery and loaded my pump gas tune back in.

Now I am getting very bad hesitation between 2k and 3k rpm. After that it seems to rev fine, but the air/fuel is on the lean side. I added WOT FUEL on my DSP, and it's about right now.

My question is could the 1/4 tank of e85 left in my tank be causing my hesitation problem?

Got some data logs? Better to use those than have us just guess at it.

Why wouldn't you just drain the E85 completely?
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Old 01-31-2014, 10:40 AM   #3 (permalink)
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Quote: Originally Posted by NachO_SRT View Post
Got some data logs? Better to use those than have us just guess at it.

Why wouldn't you just drain the E85 completely?

Is there a easy way to do this? ^
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Old 01-31-2014, 11:38 AM   #4 (permalink)
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Jump the fuel pump relay, undo the fuel line at the rail...
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Old 01-31-2014, 12:41 PM   #5 (permalink)
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Cool, does this run the risk of overheating the pump?
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Old 01-31-2014, 01:36 PM   #6 (permalink)
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Quote: Originally Posted by ACR_Joe View Post
Cool, does this run the risk of overheating the pump?

Not when it has fuel to pump - if you leave it and it runs without fuel, yes. Otherwise, if your prudent, and pay attention, no, it's fine.
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Old 01-31-2014, 02:11 PM   #7 (permalink)
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My problem is, what do I do with the fuel once I drain it? I plan to go out an drain 5 gallons here shortly. I wish I owned another car that was flex fuel.
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Old 02-08-2014, 07:46 PM   #8 (permalink)
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Quote: Originally Posted by DMW View Post
My problem is, what do I do with the fuel once I drain it? I plan to go out an drain 5 gallons here shortly. I wish I owned another car that was flex fuel.

I mix it with my lawn mower gas =-) no more than 50/50
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Old 02-08-2014, 08:40 PM   #9 (permalink)
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Quote: Originally Posted by DMW View Post
My question is could the 1/4 tank of e85 left in my tank be causing my hesitation problem?

Yes that's 100% the problem.
The 1/4 tank of E85 has shifted the stoichiometric ratio enough to jack with the fuel trims.

Its not a big deal besides being annoying and given enough time the Fuel Trims will fix the hesitation and for certain the issue will be gone once you fill up again.

Personally I'd just avoid WOT and just run the tank out.
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Last edited by duster360; 02-19-2014 at 08:29 AM.
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Old 02-19-2014, 08:26 AM   #10 (permalink)
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Quote: Originally Posted by squarebit View Post
Jump the fuel pump relay, undo the fuel line at the rail...

Took the words right out of my mouth.
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Old 02-20-2014, 02:02 PM   #11 (permalink)
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This was resolved after a couple more tanks of regular 91.

Now I have just have the tiny hesitation at 2k rpm because of the AGP RL. I have the parts on the bench to convert it to after the rail so hopefully everything will be right once this is done.
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Old 02-24-2014, 07:01 AM   #12 (permalink)
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I converted the fpr to be after the rail and now she drives like stock again. No hesitation whatsoever.

Sent from
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e85 back to pump-1393250405382.jpg  
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Old 02-24-2014, 09:28 AM   #13 (permalink)
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^^ ohh Shiny!
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