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this is a 2006 ford ranger 4.0 auto. running a eaton m90 supercharger at 3.5 lb.s of boost.
ecm is showing a p0171 and p0174 but short term fuel is at .85 and long term is at 1.2 ? no vacuum leaks.
if i introduce a vacuum leak fuel trim dose not change ? i was running this combo for a few months with no issues ran great.
didn't ck fuel trim back them but no issue so didn't see the need. pulled the engine at the beginning of the month to replace timing
chain cassettes replaced the rings seeing i was there. did replace one stuck open fuel injector and both upstream o2 sensors.
no exhaust leaks the code will set with in a minute of driving what i have is a sct programmer but i can data log. i have a aem air/fuel gauge
it bounces around 14.1 to 14.9 most of the time.
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