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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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  #1  
Old 03-23-2014
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P0171 p0174 problem

I just replaced my upper and lower intake manifold gaskets, fuel injector o-rings, replaced some vacuum lines and replaced plugs,wires, oil change, and MAF sensor all within this year. Yet those two pesky codes keep returning.
I got a live data code reader and the freeze frame data shows the code pulling at 1408 rpm with the engine at 88 degrees centigrade. My fuel trims: LTFT both at 24.2% and my short terms at bank one 21.5 and bank two 19.5

Does anyone have any idea what's going on. I'm stumped and running out of cash.
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Old 04-15-2014
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http://engine-codes.com/p0171_ford.html & http://engine-codes.com/p0174_ford.html. It looks overwhelming but, usually its a vacuum leak some where. Check all the vacuum lines and gas cap for leaks, cracks, melting.,.....etc.

Last edited by BL00DPIG; 04-22-2014 at 05:39 AM.
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Old 02-26-2015
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I found that my front hubs were leaking vacuum. I replaced the front bearings, the right side was ready to fall apart but you couldn't feel it driving it. I replaced the factory vacuum hubs with manual locking hubs and blocked the vacuum lines to the hubs. After doing this my check engine light quit coming on. I also installed a vacuum gauge to keep track of the vacuum of the engine, it idles at 24psi of vacuum. Problem fixed
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Old 06-12-2015
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Quote:
Originally Posted by Darrell N View Post
I found that my front hubs were leaking vacuum. I replaced the front bearings, the right side was ready to fall apart but you couldn't feel it driving it. I replaced the factory vacuum hubs with manual locking hubs and blocked the vacuum lines to the hubs. After doing this my check engine light quit coming on. I also installed a vacuum gauge to keep track of the vacuum of the engine, it idles at 24psi of vacuum. Problem fixed
Darrell,
where did you get the parts for this? I have the same two troublesome codes and had a garage do a smoke test and found nothing
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Old 06-12-2015
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I got all the parts for the front end off E- bay
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  #6  
Old 06-12-2015
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Thank you

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Originally Posted by Darrell N View Post
I got all the parts for the front end off E- bay
Thank you
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Old 06-13-2015
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Did you replace this elbow?
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I replaced the whole tube with both the front and back elbows, code went bye-bye.
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  #8  
Old 06-13-2015
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Originally Posted by powerranger262 View Post
Did you replace this elbow?

I replaced the whole tube with both the front and back elbows, code went bye-bye.
I have not yet, so far just did a tune up and had a smoke test done, no leaks on smoke test
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Old 06-13-2015
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Think I found the issue

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Originally Posted by AZ vaper View Post
I have not yet, so far just did a tune up and had a smoke test done, no leaks on smoke test
Pulled fuel filter and looked like chocolate milk coming out. Hope this fixed the issue
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Old 06-13-2015
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Ewww.
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  #11  
Old 06-13-2015
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I don't think the previous owner did anything but gas and go
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