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Ford Windstar - fixing PO171 and PO174

21 messages,  Last post on Jul 04, 2009 at 10:18 AM

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#20 of 21 Re: po174 and po 175 nightmares [gec19delta] by autodr Mar 28, 2009 (10:46 am)
Replying to: gec19delta (Mar 28, 2009 9:25 am) Good write up. Just a few details I'd like to add or change.   "A P0171 lean code for bank 1 is the cylinder bank on the RIGHT (passenger) side of the engine on Ford vehicles with a V6 or V8 engine and rear-wheel drive.    A P0174 lean code for bank 2 is the cylinder bank on the LEFT (driver) side of the engine on Ford vehicles with a transverse-mounted V6 engine and front-wheel drive. This code is not set on four cylinder engines (no bank 2)."   Right/Passenger/Rear... depending on longitudinally mounted (rwd) or transverse mounted (fwd)   LEFT/Driver's/Front... depending on mounting.   "One of the most common causes of Ford P0171 and P0174 lean codes is a dirty mass airflow (MAF) sensor."   "one of" I agree... but probably the most common is a vacuum leak.   "If the lean codes keep coming back, the MAF sensor may have to be replaced if the engine does not have a vacuum leak or fuel delivery problem."   Careful. What would happen if it had E85 added to the tank? What if someone damaged the inlet screen to the MAF (not sold with a MAF unless you get the entire air cleaner housing). I've also seen some really P-Poor quality air filters (especially go-fast types) cause rich and lean codes because the nose cone is shaped wrong causing a distorted air flow shape through the MAF sensor. No part should be replaced based on the reoccurred of a code because codes don't mean "replace this" or "this part is bad". In the case of a lean or rich code, fuel trim characteristics should be observed, plus BARO reading PID, and/or volumetric efficiency calculations should be made to peg a bad MAF. One common characteristic of a faulty MAF is that the Load% PID and the LTFT PID will follow each other perfectly when graphed out.   All of the Ford Plastic intake manifolds have seal issues. I know that old TSB may only mention one style. But a lot has happened since then. Also, on Wind-ed Stars, the lower intake also leaks. Not mentioned in the TSB. The IMRC shaft seals leak vacuum. FoMoCo released a reflash that hides the leak so they didn't have to eat many under warranty. But eventually they leak bad enough there that the lower intake manifold also has to be replaced because they leak beyond what the new software can hide... the actual aluminum manifold.   As for the 4cyl engine not having a bank2.... as long as you are talking FoMoCo, then you are right. No FoMoCo 4cyl that I know of... yet... have a bank 2. But, a 4 cylinder in-line engine can have a Bank2. Just look at about a 2002 Nissan Sentra. Cyls 1 and 2 are piped to the B1S1 O2, and the #3 and #4 cyls are piped to the B2S1 O2. Then they have 2 separate Cats (inside a common housing), with a B1S2 cat monitor, and a B2S2 cat monitor. A total of 4 O2 sensors with a bank 1 and bank 2 on an inline 4cyl engine. They are out there Just not in the FoMoCO world.... so you are still in the right.
#21 of 21 2001 ford windstar transmission issues by trounda Jul 04, 2009 (10:18 am)
i pulled the transmission and replaced torque converter and front seal drove down the road 0/d light started flashing getting this code p1744 please help need this van so my mom can go to work

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