Need some help here. Got an '04 Ford Freestar 3.9 with the awfully annoying P0171. Will make this short and sweet. Watched data numerous times and found intake leaks(IMRC shaft seals, upper plenum gaskets replaced) Customer has had tough time with this one, and just finished up the intake job tonight. Watching data, shows bank 1 @ 22% LT, and short term is -3 up to +33 when revving. So we have removed all intake leaks on this thing, but still getting the above FT numbers. So went to the MAF, and backprobed the MAF Signal and here's what I found. Kind of getting stumped on the MAF sensors, and had a post last month on a Toyota 1.8L with same code. My assumption would be on a V type engine like this V6 i'm working on, wouldn't you get a 171/174 at the same time? Or am I over thinking this? Oh, by the way, Fuel pressure is ok. Is this enough dropout on sensor to condemn? One is slight acceleration, one is quick acceleration.
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