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Fuel trims

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Old 04-09-2004, 01:04 AM
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Default Fuel trims
What does it mean when your long term fuel trims are positive? Rich or lean...
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Old 04-09-2004, 01:09 AM
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Originally Posted by Snk Sknr
What does it mean when your long term fuel trims are positive? Rich or lean...
It means the PCM is adding fuel to maintain 14.7 AFR (Stoich). If it did not add the extra fuel you would be lean (>14.7) relative to 14.7. Hope this helps.

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Old 04-09-2004, 07:33 AM
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Correct. Except for the computer's intervention, you are slightly lean. Keep in mind though, that really doesn't say WHAT you'll be at WOT. This is just the PCM trying to maintain Stoich Ratio during non-WOT driving and idle.
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