Question about 2000 Ford Windstar
I HAVE THE CODES P0171 & P0174 WITH MY CHECK ENGINE LIGHT ON. MY MECHANIC BUDDY HAS REPLACED THE UPPER GASKETS AND UPPER MANIFOLD AND STILL GIVING SAME CODES. WE HAVE REPLACED ONE O2 SENSOR; SPARK PLUGS; UPPER GASKETS; AND UPPER MANIFOLD. MY MECHANIC BUDDY IS STARTING TO GET FRUSTRATED AND WE WERE JUST HOPING IF ANYONE ELSE HAS ANY OTHER SUGGESTIONS. IT ALSO SAYS EMISSION SYSTEM SERVICE RECOMMENDED. WE ARE JUST LOOKING FOR ANY OTHER IDEAS OF HOW TO FIX THIS. HE PLANS ON CHANGING THE LOWER GASKETS TONIGHT. IF THAT DOESNT WORK WE HAVE NO IDEA WHAT TO DO!!!
If you have the 3.8 liter its more than likely bad intake manifold gaskets or a cracked manifold. Ford has had several TSBs on this issue. O2 sensors do not go bad as often as mechanics say they do. I have a 1999 that after 100 dollars at the parts store solved all lean conditions on the top end. The manifold has three parts to it. A lower aluminum that houses the butterfly blades for the variable intake runners( known vacuum leak were rods protrude at passenger side of lower bad bushings likely cause). Middle riser which uses oring seals which dry out and cause major vacuum leaks. upper is more or less the top cover which uses one large oring to seal. Hope this helps!
Posted on Apr 18, 2009
Just clean the MAF (Mass Air Flow) sensor with brake parts cleaner or electronics cleaner. Real easy. Your MAF is very easy to get to. Get a new mechanic buddy.
Posted on Mar 06, 2009
Your OBD codes indicate a lean signal on both banks. (I'm assuming you have a 3.0L) Bum O2 sensors could do this. Other ideas might be to check for air leak in the exhaust as well as intake. (Your buddy did a thorough job on air inlet) Did he check PCV, EGR and around the throttle body. Some of the exhaust gaskets can go slightly and mess up the O2 signal. Good luck guys. (Been there!)
Posted on Feb 06, 2009
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System Too Lean (Bank 2)
Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust.
Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time.
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