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Re: 96 Windstar lean code bank 1 and bank 2. Please Help
I don't know where you did your research but 95% of the time, P0171/174 (lean bank 1/bank 2) is a vacuum leak. I would bet money that either you have a bad PCV line from the valve to the intake, or a bad PCV valve itself (which would account for the oil pooling in the intake). Also, I think you have the wing-style upper intake, I have seen some of these leak similar to the plastic bubbles that were used later.
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