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Old 07-26-2012, 12:15 PM   #1
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Default air fuel ratio wont stay tuned

Link ECU. Tune the AFR to a set point. Wideband indicates a certain mixture point. Later, go to the same conditions (rpm, load, temp, etc) and the lambda compensation is having to add fuel. I don't store any auto tune. Get back to that same point later, and the mixture is just fine.

Ideas? I'm thinking flaky fuel pump, clogged fuel filter... Could I have a couple revolutions of misfire on one cyl and not really notice it, thus making the O2 sensor see a lot of oxygen, even though there is enough fuel to burn it?
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Old 07-30-2012, 03:54 PM   #2
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How much compensation is it adding? A couple percent could just be as simple as humidity or something, but a lot could be worth looking into.

Did you or Andrew end up driving that car home last night with no exhaust?
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Old 07-31-2012, 12:11 AM   #3
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Maybe you need to recalibrate your wideband.
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