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Old 12-20-2020, 09:37 PM   #1
dholloway543
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high fuel trims

Back 3 months ago I zeroed out all of my fuel trims buy adjusting the MAF sensor and they stayed zero. Now 3 months later I have all positive fuel trims some up to 9%. The only thing that has changed is the air filter and the temperature. Do you think that could be the variable that changed or is it a sign of something else.


Ex. the combined fuel trim at 600rpm 0.15 engine load is at +8.1%
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Old 12-20-2020, 09:46 PM   #2
Spuds
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Originally Posted by dholloway543 View Post
Back 3 months ago I zeroed out all of my fuel trims buy adjusting the MAF sensor and they stayed zero. Now 3 months later I have all positive fuel trims some up to 9%. The only thing that has changed is the air filter and the temperature. Do you think that could be the variable that changed or is it a sign of something else.


Ex. the combined fuel trim at 600rpm 0.15 engine load is at +8.1%
What tune are you using?
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Old 12-20-2020, 09:54 PM   #3
dholloway543
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A custom tune made for a my specific turboed car
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Old 12-21-2020, 03:57 AM   #4
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fuel trims at idle can vary quote a bit with large variations in intake air temperature.


Add 4% to maf scale in that low end area then 2% to thexarea jist above to smooth it in
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