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i guess it vary between engines but 12% Co2 is usually signs of a efficient engine and 14% is more efficient, anything below 12% is a problem.
what did you use to check the vacuum?
my guts is telling me its probably that low fuel pressure problem. i guess its good that your tackle that first. And try changing to a oem 240sx filter. also cleaning the strainer.
neways, so there's no signs of misfire at all?
btw you know if you fix this lean condition problem , Nox will probably drop also.
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