milehighsubie303
New member
Have a couple questions, I have an e85 tune on my 2012 sti(open source) I keep getting code P0171 I can't get rid of it! Any suggestion? Anything I need to change? Thanks!
Kinda need a little but more info, also do you have a tactrix cable? Is there anyway you can send me a datalog that I can look at?
Have a couple questions, I have an e85 tune on my 2012 sti(open source) I keep getting code P0171 I can't get rid of it! Any suggestion? Anything I need to change? Thanks!
It could be a number of things, everything from mechanical, to electrical to the tune. What size of injector are you running? And can you give me a mod list?
Alright well if you can get me a datalog I'd be able to help you further, but right now other than checking for leaks in the vac lines, I'm just poking around in the dark.
Yes sir and you can send your datalogs to CBTuned@outlook.com
Put your name, make model and year of car in the subject field when sending me the logs
Ok. I have a friend with an AP is there a way I can run a datalog with it without unmarrying it from my friends wrx?
No you would have to divorce it from his car and if you have an STi it will not work on your car.
Well mods are: 1000cc injectors from injectors dynamics, DW fuel pump, invidia catted DP, Grimm speed boost controller, Perrin CAI. That's all the mods sorry I couldn't have any datalogs for you guys :/ I'm not sure the blend of the fuel the pump I go to says at least 70% ethanol
Almost reads like my mid list.
Where are you located? I assume Colorado by your forum name? If that's the case, you should be receiving 3 blends of ethanol at various times of year. Spring/fall, summer and winter blends. Winter being around 70%, spring/fall at around 75-80 and summer at 80-85%. The pump just states that there is a minimum requirement at any time of year but it's not a guarantee.
What happens is if your tuned at a specific time of year, say winter or spring, your mapping and fueling is custom to that fuel blend of a lower ethanol content. If that content changes to a higher percentage, your ECU gets scared because your AF sensors are picking up an anomaly that your exhaust gasses see too much oxygen in the burnt fuel. This will cause the ECU to call for more fuel. At a certain percentage it will trip a lean code like p0171. The ECU is trying to keep things happy until it can't anymore and calls for help.
I'm not a tuner so I hope I didn't fark that up but that's my take on it.
Ideally you would want a tune for each blend of fuel. I've heard some recommend tuning on summer blends and just run a bit rich for the other seasons.
Another reason could be that the fuel you've bought is stale or has phase separated, causing the gas and alcohol to separate. Since ethanol is a lower volume seller, usually, this can and does occur.
Ethanol also has a knack for attracting water. If your climate has shifted wildly in temps or humidity levels, water can be found in the fuel system. A catch can also be installed from the heads and crankcase breathers to catch any moisture, or oil, so it's not recirculated into the combustion chambers.
Purchasing a simple ethanol test kit can be beneficial if you plan on using ethanol. They're about 20 bucks from places like quick fuel.
Not saying this is your issue but it's some food for thought. I literally tore my hair out, some years back, searching for phantom boost/vacuum leaks and the whole shebang when all along it was a fuel issue.
When was the car tuned on ethanol? What time of year?
For not being a tuner that's a spot on response that I would give, nice job buddy
Almost reads like my mid list.
Where are you located? I assume Colorado by your forum name? If that's the case, you should be receiving 3 blends of ethanol at various times of year. Spring/fall, summer and winter blends. Winter being around 70%, spring/fall at around 75-80 and summer at 80-85%. The pump just states that there is a minimum requirement at any time of year but it's not a guarantee.
What happens is if your tuned at a specific time of year, say winter or spring, your mapping and fueling is custom to that fuel blend of a lower ethanol content. If that content changes to a higher percentage, your ECU gets scared because your AF sensors are picking up an anomaly that your exhaust gasses see too much oxygen in the burnt fuel. This will cause the ECU to call for more fuel. At a certain percentage it will trip a lean code like p0171. The ECU is trying to keep things happy until it can't anymore and calls for help.
I'm not a tuner so I hope I didn't fark that up but that's my take on it.
Ideally you would want a tune for each blend of fuel. I've heard some recommend tuning on summer blends and just run a bit rich for the other seasons.
Another reason could be that the fuel you've bought is stale or has phase separated, causing the gas and alcohol to separate. Since ethanol is a lower volume seller, usually, this can and does occur.
Ethanol also has a knack for attracting water. If your climate has shifted wildly in temps or humidity levels, water can be found in the fuel system. A catch can also be installed from the heads and crankcase breathers to catch any moisture, or oil, so it's not recirculated into the combustion chambers.
Purchasing a simple ethanol test kit can be beneficial if you plan on using ethanol. They're about 20 bucks from places like quick fuel.
Not saying this is your issue but it's some food for thought. I literally tore my hair out, some years back, searching for phantom boost/vacuum leaks and the whole shebang when all along it was a fuel issue.
When was the car tuned on ethanol? What time of year?