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Hey all ,
MY LTFT is still a bit high after fixing a thotle body leak (14.6) when at idle, however it goes down when the vehicle is being driven (9-11). I know it takes awhile to even out after a repair but why is that my LTFT changes as I drive i thought that this value was suppse to remain steady and only change slowly. My STFT is very stable around 0 +or- 4 while driving conditions change.
Your thoughts?
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I think you might be over thinking this. You really don’t base your diagnosis on LTFT especially after a repair. It’s going to need a significant amount of time to ‘normal out’. Keep an eye on your fuel mileage, if you notice a significant change THEN start looking for issues with fuel trim, otherwise call it a win and move on. It’s an old vehicle after all and the fuel trim numbers might just be a reflection of that.
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