Ryan.Adams

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April 10, 2019 at 7:05 pm in reply to: 2001 Outback P0171, Fuel problem? #44130
Ryan.Adams
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I was watching live data yesterday on my drive home and on my way in this morning a little bit more closely. As of now the Idle fuel trims have came back down to certainly acceptable levels. ST -1% to 2% and the long term give or take 4%. it seems that while accelerating the trims will both very quickly soar up high but if I’m going a constant speed and staying under an apparent magic number of 2,000RPM the trims level back off to what they were at idle. if I push it past 2,000RPM the trims climb quickly and anything over 2,500RPM maxes out the fuel trims.

Upstream is an A/F sensor, Not sure what it is “suppose” to read on a Subaru but it is averaging 3.6v-3.7v The downstream at Idle seems completely normal .1v to .8v fluctuating nicely unless much load is placed on the engine and it flat lines 0.000v with blips on 0.050-0.070 and back to 0.000
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