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Author Topic: 1.8T engine is running too rich - Long Term Fuel Trim -19% please help :(  (Read 86594 times)
userpike
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Ideally, if you are going to change any adaptation values, it would be to return them to stock...


agree 100%. a vw tech told me he resets adaption values even for oil changes. so really any kind of maintenance, tune ups, part changes/upgrades, or whatever; you want to reset the adaption values to stock and let the ECU "relearn" the values on its own. Obviously, if you've tuned using the adaption values you would want to keep those settings. I don't think that is the case here though.
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userpike
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I just did it
I have a print screen of data I got after I hit read ecu:

I also hit save to disk after I did print screen so I'm adding file I got after that


hit that "set defaults" button, erase DTCs and go for a drive.  you have the current settings saved, so no worries.

How many miles before you used Unisettings for this info did you reset adaptions values?
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nyet
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those all look like the defaults already...
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funnix
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« Reply #78 on: February 06, 2015, 01:47:32 AM »

Could the problem be solved?

I think i've a similar problem!

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nyet
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« Reply #79 on: February 06, 2015, 11:56:02 AM »

There are a million different reasons fueling might be out of whack.
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Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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« Reply #80 on: February 11, 2015, 04:13:56 PM »

Has any one thought of a failing turbo or valve seals Huh If the turbo or valve seals are leaking the burning oil will cause the O2 sensor to read rich. The burning oil will cause this problem. The the front O2 sensor will see it as a rich condition. It will not take much oil to cause this. You might not see the burning oil smoke if you have a cat.

Another thing ... What fuel are you running ? pump fuel ? track fuel ? E85 ? .... what about that DV Huh I have seen the Forge valve open up when driving aroun town causing rich conditions. What spring do you have in the DV ? If you pressure test the system with a Forge valve it will pass and will  show no leaks but when you drive around town the vacuum will open it up  and cause the mass Air sensor to read incorrectly.

Lee
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funnix
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« Reply #81 on: February 12, 2015, 12:49:15 AM »

Hey Lee,

thank you, my problem is:

LTFT: -10,8

STFT: -2,3 till +1,6


charge-air duct ckecked with 2Bar-> no leaks

DV -> new
N75 -> new
PCV -> new
Temperaturesensor -> new


If i driving full throttle my boost is pulsing (1,1 - 1,4 Bar)
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10101011
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« Reply #82 on: February 12, 2015, 04:55:15 AM »

Hey Lee,

thank you, my problem is:

LTFT: -10,8

STFT: -2,3 till +1,6

That sound like a MAF  sensor failing or the hose between the turbo and air filter is cracked . Do you have a cone air filter ?


charge-air duct ckecked with 2Bar-> no leaks

DV -> new
N75 -> new
PCV -> new
Temperaturesensor -> new


If i driving full throttle my boost is pulsing (1,1 - 1,4 Bar)
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overspeed
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« Reply #83 on: February 12, 2015, 06:47:28 AM »

Hey Lee,

thank you, my problem is:

LTFT: -10,8

STFT: -2,3 till +1,6


charge-air duct ckecked with 2Bar-> no leaks

DV -> new
N75 -> new
PCV -> new
Temperaturesensor -> new


If i driving full throttle my boost is pulsing (1,1 - 1,4 Bar)

Looks like leak... little, but consistent...
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10101011
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« Reply #84 on: February 12, 2015, 07:06:32 AM »

What are the long term fuel trims at idle and part throttle ? 
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funnix
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« Reply #85 on: February 15, 2015, 11:22:51 PM »

I've got Touque Pro app to log LTFT & STFT

The LTFT is steady at -10,8 maybe -12

and the STFT is moving at -1,2 to +1,6



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nyet
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« Reply #86 on: February 15, 2015, 11:41:13 PM »

idle and part are the same?
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Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
10101011
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« Reply #87 on: February 16, 2015, 06:06:26 AM »

I want a screen shot of ( MVB ) meausuring bock 32 and 111.
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funnix
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« Reply #88 on: February 16, 2015, 06:59:26 AM »

@Nyet: In the Tourque Pro Android App i only have LTFT1 and this Value ist steady -10,8 and sometimes -12,..


@10101011: In the evening i will upload a screenshot!
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funnix
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« Reply #89 on: February 18, 2015, 11:16:04 AM »

Sorry guys,

litte late...


If i pump the break pedal the value in block 33/1 increase from -0.8 to +20,4 for short time!

in the boost gauge the needle increase from -0.8 to -0.6 while pumping.

I've checked the vacuum line to the brak booster with a compressor and found... nothing!



Sorry i missed the 111 block, so here it is:

1: -1,3%
2: -0,3%
3: 0%
4: 0%


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