Short term fuel trim %

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Gordy

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I have read where the short term fuel trim should aleays be between =/- 10%. Is this reading at idle, or through all throttle ranges.

The Hoe runs fine, but I got the p1071, and p1074 both banks yesterday. Nothing changed as far as how it ran, but the ltft was +35% usually it is usually+25% or less, stft was 35% was running fine. we hit -17 so it got pretty cold. So I cleared the codes to see if it pops up again.

Doing the research on the codes though got me looking at what the fuel trims should be which I did not know. Im usually in the +- 10% range with stft.


I never really paid much attention to it since I bought my code read still trying to understand the data, and what it should be with o2 sensors fuel trim ect.

Sometimes I think these codes pop up dur to water/ humidity/ cold conditions, and really are not an indication there is truly something array unless it is actually running like crap.


The Hoe runs good milage could be better.
 
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andrew383

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Have you been getting your gas from the same station????When was the last time you changed the fuel filter???
 
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