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11/09/2022 9:38 pm
Topic starter
hi i have a 2009 toyota hilux dual cab workmate with 2.7 l 4 cyl 330500 km scan tool says -4.7 on long term fuel trim is this bad and or what does it mean
2 Answers
2
12/09/2022 12:17 am
Ideally you want zero (optimal mixture), or within a few points.
The negative sign means the computer is trying take away fuel. But this number is useless by itself.
ST & LT fuel trims must be analyzed in concert.
3
11/09/2022 10:54 pm
It means your engine is running a little too rich. Do Scotty's video, make your car run better with spray cleaner, change your air filter and maybe run a little fuel injector cleaner to see if it improves.
