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What are acceptable long term fuel trim numbers?

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Old 04-01-2019, 08:32 PM
Ben Matheson's Avatar
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Default What are acceptable long term fuel trim numbers?
Did a search but nothing indicated a normal range
 
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Old 04-02-2019, 02:20 PM
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I believe anything over +10 or lower then -10 will throw a CEL if driven long enough. Below + or - 5 is good. Balanced trims for the opposing banks is important as well
 
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Old 04-02-2019, 05:40 PM
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Agree with Bill, what are you seeing? If you have long term trims drastically different something has changed.
 
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Old 04-02-2019, 05:46 PM
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Yeah, +/- 5% is good. Mine is +1.5 on Bank 1, and 2.5 on Bank 2. Fluctuates a little bit from there.
 
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Old 04-02-2019, 05:51 PM
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I was at -7 and -9. Just had exhaust flange gaskets replaced and was down to 5 and 7 after 1 short drive from the shop to home. I suspect they will continue to improve as I drive it more.
 
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Old 04-02-2019, 05:52 PM
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If you have a scan tool capable of resetting the adaptive settings, give that a go. Otherwise, keep driving for awhile and it should correct itself out (if you fixed the problem)
 
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