Fuel Trim issue
#1
Fuel Trim issue
How do you reset fuel trims? I've had this issue of my fuel trims always being .1 (.1008 on the evoscan screen). It doesn't matter how many times I reset the ecu (disconnecting battery) or what STFT is doing it's always .1. Even today after my 1000cc injector install. I have Evoscan 2.6 currently, but it was the same for 2.5 and probably whatever I had before that. I've even swapped intakes (reset ecu) and it doesn't change. I've tried the "Fuel trim idle/Fuel trim cruise" codes in Evoscan too. Same thing.
Any ideas?
Thanks.
Any ideas?
Thanks.
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#13
EvoM Guru
iTrader: (50)
The "0.1008" value is because the exact decimal value is not in the EvoScan fuel trim formula. The following EvoScan entries will give you zero values for the fuel trims when they really are zero:
<DataListItem DataLog="N" Color="" Display="LT Fuel Trim Low" LogReference="LTFT_Low" RequestID="0C" Eval="0.1953125*x-25" Unit="%" MetricEval="" MetricUnit="" ResponseBytes="1" GaugeMin="-13" GaugeMax="13" ChartMin="-13" ChartMax="13" ScalingFactor="1" Notes="" Priority="1" Visible="false" />
<DataListItem DataLog="N" Color="" Display="LT Fuel Trim Mid" LogReference="LTFT_Mid" RequestID="0D" Eval="0.1953125*x-25" Unit="%" MetricEval="" MetricUnit="" ResponseBytes="1" GaugeMin="-13" GaugeMax="13" ChartMin="-13" ChartMax="13" ScalingFactor="1" Notes="" Priority="1" Visible="false" />
<DataListItem DataLog="N" Color="" Display="ST Fuel Trim" LogReference="STFT" RequestID="0F" Eval="0.1953125*x-25" Unit="%" MetricEval="" MetricUnit="" ResponseBytes="1" GaugeMin="-25" GaugeMax="25" ChartMin="0" ChartMax="200" ScalingFactor="1" Notes="" Priority="1" Visible="False" />
<DataListItem DataLog="N" Color="" Display="LT Fuel Trim Low" LogReference="LTFT_Low" RequestID="0C" Eval="0.1953125*x-25" Unit="%" MetricEval="" MetricUnit="" ResponseBytes="1" GaugeMin="-13" GaugeMax="13" ChartMin="-13" ChartMax="13" ScalingFactor="1" Notes="" Priority="1" Visible="false" />
<DataListItem DataLog="N" Color="" Display="LT Fuel Trim Mid" LogReference="LTFT_Mid" RequestID="0D" Eval="0.1953125*x-25" Unit="%" MetricEval="" MetricUnit="" ResponseBytes="1" GaugeMin="-13" GaugeMax="13" ChartMin="-13" ChartMax="13" ScalingFactor="1" Notes="" Priority="1" Visible="false" />
<DataListItem DataLog="N" Color="" Display="ST Fuel Trim" LogReference="STFT" RequestID="0F" Eval="0.1953125*x-25" Unit="%" MetricEval="" MetricUnit="" ResponseBytes="1" GaugeMin="-25" GaugeMax="25" ChartMin="0" ChartMax="200" ScalingFactor="1" Notes="" Priority="1" Visible="False" />
#14
I had the rear o2 check disabled via ecuflash and Tephramod 5.1. I just went into ecuflash and enabled it. It works just fine now. The rear o2 cel returned, but once I get off my lazy azz, i will disable it again. Which makes me wonder, if I disable it and the ecu no longer records trims, is it going to affect my tuning any?
#15
EvoM Guru
iTrader: (50)
I had the rear o2 check disabled via ecuflash and Tephramod 5.1. I just went into ecuflash and enabled it. It works just fine now. The rear o2 cel returned, but once I get off my lazy azz, i will disable it again. Which makes me wonder, if I disable it and the ecu no longer records trims, is it going to affect my tuning any?