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Old 09-23-2022, 02:56 PM
Trio3b Trio3b is offline
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Re: 3.8L P0171 High STFT

Ouch! Sorry. Trying to do this on cell phone. Can't see #/%#*×.

Engine starts cold fine and idles in open loop for ~ 30 seconds with fuel trims good. THEN closed loop and STFT shoots high. If memory serves LTFT is not outrageous but will check again. I do not recall OL at WOT but will check again. Am using Innova tool with limited live data but I believe I can check O2 sensors and post back.

NOTE: A little history. Last year, car would start hard then lope terribly. Never could find idle. Found vac leak in that stupid vac line rats nest near throttle body. Fixed and no longer does that but still the lean condition. This happened AFTER all the "fixes" listed above. Car is driveable but ECM still trying to correct a lean condition.

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