Originally Posted by
steveo
low BLMs mean it is removing fuel. it doesn't really mean the ECM thinks its rich, it means 'i think i WAS rich but i went and fixed that'.
in this case it has made a large (~18%) correction. but, if this assessment is false (o2 issue?) that means you are actually running lean.
108 is the limit too, so it's gone as far as it can
since it's bone stock this is abnormal.
besides a badly leaking injector or severe sensor fault it's really really hard to make a fuel injected engine run rich. since your engine is an air pump, usually an ignition or mechanical issue pumps oxygen into the exhaust which reads as lean drives your trims UP (adding fuel).
i haven't looked at your log but make sure your TPS,MAP, and coolant temp readings are sane. after that, how about purposefully fault the o2 by unplugging it and see if it runs better?
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