Fuel Issue - Check Engine light

[MaXimus0076]

Anyone have an idea what the heck this is?

6208 - Fuel Trim; Bank 1 (Mult)
P1128 00 [101] - System too Lean
Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 78348 km
Date: 2017.03.09
Time: 19:10:53

Engine speed: 681.00 /min
Normed load value: 11.0 %
Vehicle speed: 0 km/h
Coolant temperature: 84 °C
Intake air temperature: 68 °C
Ambient air pressure: 1010 mbar
Voltage terminal 30: 12.999 V
Unlearning counter according OBD: 40
Engine speed: actual: 672 /min
MAF_ENVD: 103.49411 mg/stroke
Coolant temperature (unfiltered): 84.8 °C
Engine: operating status: IS
T_AST_ENVD: 51.40 s
STATE_LS_ENVD[1]: 2

[chrisucf99]

What kind of gas are you running in the car? Could also be bad MAF or O2 sensor.

[sonic32]

What kind of gas and was a/c on?


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[MaXimus0076]

I am using E85 mix with 93 octane. On a 16 gallon tank, I used 5.89 of E85 and the rest of 93. No AC was on, just the radio

[chrisucf99]

You could have put in too much E85 and leaned it out. Go drive around and top off with some more 93. It'll clear up.

[whiped]

What does your fuel trim look like?

Was this on startup?

My guess is the Ethanol or not giving enough time for the LTFT to adapt.

Did you have an Ethanol in the tank before? How long after fill up was this? Any idea the overall E% in the tank?

[MaXimus0076]

What does your fuel trim look like? I have to check

Was this on startup? Yes. I was in the process of changing some VCDS settings and then I clicked on Scan for codes and the check engine light came on

My guess is the Ethanol and not giving enough time for the LTFT to adapt. Too much E85?

Did you have an Ethanol in the tank before? Yes. I had the same mix. I am on a half a tank now.How long after fill up was this? 4 days Any idea the overall E% in the tank? Nop

[sonic32]

If you're playing with mixes without a dedicated file you will get those lean codes.


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[MKGIY]

What does your fuel trim look like?

Was this on startup?

My guess is the Ethanol or not giving enough time for the LTFT to adapt.

Did you have an Ethanol in the tank before? How long after fill up was this? Any idea the overall E% in the tank?

How do you check the fuel trim? I had the same codes come up recently.

OP - is you gas millage off as well?

Thanks,

[MaXimus0076]

No idea how to check it. I know GIAC said its ok to mix, but I dont know if I have the correct MIX though. I might just switch to 104 octane

[rtl5009]

You literally made E38 exactly. So if there was a little extra e in Either the gas or the e85 it would have put you over the edge.

[whiped]

I'm in class but I will post some details after I get home tonight or tomorrow.

I've gotten a few PMs about this so I will try to put a thread together. If anyone is free and can beat me to it I'd appreciate it.

[whiped]

Long day yesterday and my laptop was just about dead when I made it home.

Here are some fields you can log in VCDS:

Long term adaption of mixture formation bank 1
Long term adaption of mixture formation bank 2
Short term adaption of mixture formation bank 1
Short term adaption of mixture formation bank 2
Lambda probes actual: bank1
Lambda probes actual: bank2
Lambda probes specified: bank1
Lambda probes specified: bank2

There are a few others but those will give you a good idea of what is going on.

There is some more info in Jrans thread: http://www.audizine.com/forum/showth...rmance-Logging

Another good way to check how the car is running is to look at your plugs.