Hi guys. I have watched a ton of your videos and loads others and still stuck. i am working on a 2001 corolla.1.8l..174,000 miles. code is a po171..lean bank 1. I have high fuel trims. shrt sometimes maxs out at 19.5% and lngt is always high 15 to 20 % +. Trims will drop at 2500rpm…maf reading about 1.8 at idle and rises up to 8 or 9 at 2500rpm. I have done a smoke test and could not detect a leak. o2s b1 wave looks ok, average about .485, and does switch wave from .1 to about.800…I dont think its fuel delivery because the trims drop at higher rpms. . vacuum tested about 21 with needle bounce, possible valve guides leak?
Freeze frame showed Fsystem..cl…ECT 179Deg,,, shtft -2.2,,, lgtft 34.4%,,,rpm, 710,,,,,IAT 95Deg,,,
I am about to start throwing money at it. not sure what else to do. i need the car fixed to pass emmisions for my daughter to start college. Live in tx and have to pass emmisions. Looking at new maf,o2sensors. Already changed pcv and air filter and cleaned the maf.Help !!
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