P0171 2000 Explorer
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P0171 2000 Explorer
Here's the deal. I have a 2000 Explorer XLS with 90,000 miles. For the last few months I've been getting a P0171 lean code. I have reset the code, but it comes back on usually after 50 miles or so. I've changed fuel filter, PCV valve, run some injector cleaner, cleaned and tested the MAF sensor. I also checked the PCV hose that people have reported as a culprit and it looks fine. The weird thing is that it doesn't seem to affect the performance at all (no stalls, weird idle) like other people are reporting with this code, although my gas mileage seems a little lower. I would really appreciate some advice on what to check before I take it in to Ford. Thank you in advance!
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From: Washington State
aemter My girlfriend has a 1997 Ford Explorer XLT 4.0 SOHC engine with about 88,000 miles on it. PO 171 & 174 codes developed. I cleaned the IAC first. The codes stayed clear for a while but came back after a couple of months. I then bought a new IAC and cleaned the MAF. That lasted for a couple of months. We had the spark plugs and PCV valve changed. The problem popped up again. Finally we had the lower intake manifold gaskets changed. That seemed to do the trick because now when we start it up in the cold weather it's smooth as a baby's bottom--no hesitation whatsoever upon warmup. And those codes has stayed away for about a month and a half now. I wish I had done the lower intake manifold gaskets first instead of all the other stuff. I would advise you not to let anyone talk you into changing the Oxygen sensors because from what I've read that doesn't cure it and it's very expensive. Good luck.
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UPDATE:
Since I wrote my initial post, I took off the PCV hose and put hose clamps on both ends and reinstalled it. The hose seemed like it fit too loosely on the ends which prompted me to do this. The check engine light has stayed off for almost two weeks now after I made this change. All in all--the repair cost me about $0.20! The hose must have been loose enough to be causing a slight vacuum leak. I'm glad I found this before I decided to take it to Ford!
Since I wrote my initial post, I took off the PCV hose and put hose clamps on both ends and reinstalled it. The hose seemed like it fit too loosely on the ends which prompted me to do this. The check engine light has stayed off for almost two weeks now after I made this change. All in all--the repair cost me about $0.20! The hose must have been loose enough to be causing a slight vacuum leak. I'm glad I found this before I decided to take it to Ford!
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canyonbreeze
Explorer, Sport Trac, Mountaineer & Aviator
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Oct 13, 2011 08:28 PM
