Open flash issue
 

Open flash tune: I haven been running corn fuel for approx 3000 miles an never had a problem. Two weeks ago I switch back my tune to the original for my free oil change at the dealer. I immediately went back to corn fuel and stage 2 EL tune but a couple day after the traction control light and check engine light came on. I drove the car for a couple of days and at times the car would lose power...I tuned the car back to the original time and both lights went away. I am hesitant of going back to E85 but sure miss the power. Is a 2015 with only 11k miles. Any thoughts?thx

What codes threw?

Not sure what you mean...just the traction control and check engine lights came on and once loss power as I was on first gear. Got concern thinking it wasn't related to the open flash and reading articles of having to open the motor to address this issue I then decided to flash it back to the original tune to be able to take it to the dealer and when I concluded with the tune I realized both lights when off.


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Open flash tablet can read/clear codes, if you can read them, then report here for more help. Without them its just guessing

Any codes?

Anything plugged into the odb port when this happened?

I had a similar issue with my 86Nanny plugged in, turned out to be a weird/bad batch of ODB connectors that made intermittent connection - every time it lost connection and regained it, it would try to handshake and sent the ECU into fits. Fixed the connector and no issues since. I should add, support was awesome -it could be anything not quite properly seated on the ODB causing this. Also, the code is important, just in case it's something else.

Use your OFT (under diagnistics i think) to read out the check engine light (CEL) code is will be something like Pxxxx or Uxxxx. if you post up what the codes are we might be able to help

A check engine light always has a code associated with it that gives you an idea of what the problem is (well, it gives you a place to start looking for a prob anyway). An OBD2 port reader or your OFT can read what this code is

Post the codes. Also a log containing your fuel trims would be helpful.

Why did you flash back to stock for an oil change? They aren't going to plug into the OBD port for that, and even if they did they wouldn't have the tools at the dealership to compare the ROM on the computer to a stock ROM.

Are you serious. I had no idea. I was under the impression they would find out. And the car was running incredible....I will flash it back in a couple of day when I fill up e85 and see how it goes.


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I will. Thank you.


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Maybe he found the one proactive dealer in the world who likes updating customer cars ;).

Warning they can check the CVN (checksum value) with techstream/subaru ssm tool. This gives them enough to prove the rom in car is non standard. The CVN is available as a standard PID so can be pulled even on ecutek/brzedit locked tunes. And will catch you out even if you flash a "stock" rom with Ecutek due embedded licience info changing CVN.

With OFT or Tactrix you can flash back a 100% stock rom and CVN will match the stock rom calid CVN.

As stated its extremly unlikely thet they will check the CVN at standard service. as they have to look up the value of stock rom CVN, but its possible.

They would only usually check CVN if you had problems or maybe other obvious mods .

They usually plug in their diagnostic tool at any service to check for stored codes also not all fault codes the CEL light.

Thank you sir. You da man


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Glad to report; I am back running e85 with the stage 2 el tune and the car is running great, no warning lights. What a difference E85 makes.


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Spoke too soon...the check engine light and stability control lights came back.


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I have no idea how to read the codes. Help greatly appreciated.


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plug in oft, go to diagnostics i think then read codes

http://uploads.tapatalk-cdn.com/2016...7e97b908f8.jpghttp://uploads.tapatalk-cdn.com/2016...9742f389f7.jpg



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Hi Steve is this what you are referring to?


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Figured it out code P0171. Too lean ?? Exhaust leak..


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Code is P0171. When I flash the car back to original or stage 1 the CEL and traction control disappear. Wouldn't that tell me that is the tune that's is bad and not a leak or air sensor, fuel trim ect??


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When you reflash the CEL's are reset. If you have a problem they will reappear after some driving.

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as elbarto said each time you flash ecu and cel codes are reset, the lean code make take a day or two of driving to show up, it will usualy be accompanied by high long term fuel trims of over 10%

its possible its minor exhaust leak and the stock tune tolerates it but the other tune does not.

i assume you have changed header ? did you use new gaskets and are o2 sensors screwed in all the way so ring is not loose, you may need to retap thread in hearer if their tight

I thought the CEL limit was +/-30%. Plus look at the screen shot, LTFT of 29%.. @steve99 the 1st post just mentions an oil change service.

I'm hedging my bets on incorrect tune. It's trying to add in 30% more fuel, just like what an E85 tune should....

yep correct limit is +/- 30% (or even 40% in some tunes) but if I was thinking along the lines of if you initially log tune and you see values over 10% and getting bigger its an indication something is not correct, as opposed to waiting for the ltft to hit 30% a while later.


yeah its possible he's flashed a E85 tune on petrol or the other way round for sure


petrol tune on E85 fuel will run way lean so that's possibility as his LTFT in that photo looks like +28 or a rearly bad exhaust leak


just need to confirm his ltft is ok on the stock tune with petrol

I have the exact same error code. I am running the E85 cal as well. The LTFT everywhere except at idle is dialed in but at idle it is usually 15% or thereabouts. Once in a while it hits 30% and sets the code. This isnt any leak or anything just something in the calibration that does it. Somehow the fuel mults that we did for E85 isnt applied at idle. I am thinking this can be fixed by adjusting the fuel pressure mult at low pressures?

I drove over 3000 miles in e85 stage 2 and no headers and the car drove perfect. I switched back to the original tune and petroleum for a dealer visit. As soon as I went back to e85 and stage 2 the issues started...I didn't do any different. So I went back to petrol and stage 1 tune and was fine and last week took a chance and went back to e85 stage 2 el and the cel and traction lights are back. The car is not running well and I still have over half a tank of corn fuel.


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Nothing to worry really because the LTFTs are out of spec only at idle. Causes idle hesitation but nothing to worry

They should still be in spec, or something is off.

I had a small exhaust leak (I believe at the header>midpipe) that gave me similar troubles - except that city driving in general was affected and there was some really odd behavior here and there.

C

Re-installed the air filter again, closed the gas tap tide, re-flashed, drove approx 20 miles and no issues so far. Will see.


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