Question about 2000 Ford Windstar
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Posted on Jan 02, 2017
P0171 is system too lean bank 1, P0174 is too lean bank 2, and 302 is misfire bank 1. Look for vacuum leaks. If you don't find them, put a vacuum gage on it can check. The P0171 is almost always a vacuum leak. If not other possibilities are front O2 sensor is too old and should be replaced (if mileage is greater than 100k then replace). Try injector cleaner. Misfires are usually bad spark plugs, but could possibly be caused by insufficient fuel. I've never had a car of mine in bad enough shape to have that error.
Posted on Oct 24, 2008
SOURCE: OBD codes P0171 and P0174
Look on the passenger side of the intake at the rubber elbow attached to the big black plastic tube and then to the intake manifold. Make sure it is not sucking shut and maybe a small hole in the bottom of it.
Posted on Mar 20, 2009
If you do not find an obvious problem in the vacuum hoses or PCV connection, I would sadly suggest you prepare yourself for a new lower intake manifold gasket. Those two codes combined indicate that the leak is not in one spot, but across the rear of the intake. This 4.2 V6 is known for this failure, and many TSB's have been issued regarding it. If you don't want to spend hundreds replacing sensors and getting your ECM rebuilt just to have a truck you cannot get inspected, spend the $90 for a smoke test on the vacuum system. I wish I had done that two weeks ago. I will be changing the gasket this weekend.
Posted on May 08, 2012
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