Long Term Fuel Trim
Imported from Detroit
Joined: Apr 2009
Posts: 1,051
From: Michigan
Re: Long Term Fuel Trim
Actually you need to add the STFT and LTFT together. The total shouldn't exceed 10%. They could be -/+ and adding could equal zero which would be perfect.
Hybrid and Ethanol Expert
Joined: Mar 2005
Posts: 3,616
From: All over the Central U.S.
Re: Long Term Fuel Trim
Should be 0 with plain gas in normal condtions at sea level. The number should go negative at higher altitudes and go positive with ethanol use.
Should be about 3.5 with 10% ethanol in the gas.
Should be about 3.5 with 10% ethanol in the gas.
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