P0171 System Lean (Bank 1), Knocking, Low Idle - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 05-01-2009
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Icon5 P0171 System Lean (Bank 1), Knocking, Low Idle

I recently failed my emissions with a P0171 code. I know this could be a lot of things, but there are some other symptoms that go along with the problem.

My engine has a faint knocking that sounds like a misfire. I tried higher octane gas and the sound kept on.

I idle rough down at 500-600 rpm's, and have stalled in the past. I changed the fuel filter and that helped with the stalling, but there is still some occasional hesitation. Once I get going it runs great, but my fuel mileage is down to 15-16 MPG highway.

I cleaned the MAF and throttle body tonight, but I am sure there is more to all this. I am going to get a new hose for my PCV valve because it seems to fit over the valve pretty loose.

What else do I need to do?

Also, I disconnected the neg. terminal to take off the MAF and of course the CEL went off and the code is cleared. How long or far do I have to drive before I know whether or not the problem is fixed?

I know I'm throwin' a bunch at y'all, and I appreciate any feedback.

Thanks.
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Old 05-01-2009
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you should reall learn to use the search feature on this forum.

p0171 is a lean on bank one, most often caused by a vacuum leak somewhere. Go check all your hoses for crack/dry rot or leaks/holes.
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Old 05-01-2009
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Originally Posted by PickupMan92 View Post
you should reall learn to use the search feature on this forum.

p0171 is a lean on bank one, most often caused by a vacuum leak somewhere. Go check all your hoses for crack/dry rot or leaks/holes.
X2
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Old 05-01-2009
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Get a can of carb cleaner and while the truck is running spray some on the vacumme lines, one at a time. If the idle picks up then right where you sprayed is your leak.
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Old 05-01-2009
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Personally... I wouldn't go around spraying carb cleaner all over a hot motor... I'd go more for the soapy water and look for bubbles.
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Old 05-01-2009
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Personally... I wouldn't go around spraying carb cleaner all over a hot motor... I'd go more for the soapy water and look for bubbles.

Well no, you dont do it hot. I figured everyone would have figured that out. Best time to do it is first thing in the am after the high idle has calmed down.
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Old 05-01-2009
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I had to say it lol Can't ever tell with people on here haha.
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