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  #1  
Old 05-20-2010, 10:25 AM
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Join Date: Dec 2007
Location: Texas
Vehicle: 1998 Ford F150
Posts: 20
Fixed my Codes P0171, and P0174

probably not for everybody but this fixed mine.

reach in deep.
Click the image to open in full size.

my fingers are on it!
Click the image to open in full size.

grab this!
Click the image to open in full size.

with the motor running you'll be able to feel the suction coming thru this crack.
Click the image to open in full size.


replace the rubber tube piece with part from dealer or what i did is found some heater hose that was the same internal diameter and cut it a little bit longer (because the heater hose is stiffer it's harder to fit) and install.

heater hose has only been on about a month and it's doing fine, when/if it does fail I'll update.
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  #2  
Old 05-26-2010, 12:16 PM
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where exactly is this piece located i couldnt find it .
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  #3  
Old 05-26-2010, 12:26 PM
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What year is your truck?

My Mom has a 98' with the 4.2 V6 and it is giving these same codes. Saying that "Bank 1 is lean". I couldn't find that hose you have there, but I know where to start looking now. Thanks.


Did your truck run like crap, wanting to stall and everything before you fixed the problem? Thanks for all your help!!
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  #4  
Old 05-27-2010, 01:47 AM
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not sure what it's called. it goes on a nipple that comes from the plenum and goes back somewhere between the plenum and the firewall
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  #5  
Old 05-28-2010, 05:12 PM
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P0171 bank 1 and P0174 bank 2

So you have to remove the intake manafold to reach the pvc line? I was told that that code means cracked manfold. I have been having the same code pop up for some years know and I have heard alot of diffent solliutions. I know I have replaced the o2 sensor twice in 7 years. I have an 2003 f-50 stx 4.2. What about the exahust like the other guy was talking about?
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  #6  
Old 05-29-2010, 04:39 AM
glc glc is offline
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It could be anything that causes a vacuum leak. I just had to replace my intake gaskets, isolator bolts, and bushings. If you want it fixed right, you may have to take it to a competent dealer for diagnosis.
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Old 05-29-2010, 05:48 AM
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clean that engine bay
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  #8  
Old 05-30-2010, 04:37 AM
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Still going without any CEL or any other problems. no, didn't have to pull anything except the tube and end fittings that i'm hold in the picture.

and yea, their are a whole bunch of reason that this code could come up. this time it was a quick easy fix. just about any of the vacuum hoses that have anything to do with fuel or exhaust can cause those 2 codes. o2 sensor in my opinion would be last to check if throwing both codes, both sensors are not likely to go out at the same time.
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Old 05-30-2010, 10:54 AM
glc glc is offline
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It's very unlikely that bad O2 sensors will cause lean codes - when it throws those codes that means the O2's are doing their job. It has to be either too much air or not enough fuel. Too many people see those codes and immediately blame the O2's - which are the LAST things you change.
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Old 05-31-2010, 02:09 PM
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partial blame can go to places like Auto Zone. last time they read my codes the employee went right to picking parts that would "fix the problem" first thing he pulled was o2 sensors... i bought a coke and 3 musketeers.
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  #11  
Old 05-31-2010, 02:37 PM
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On my 97 with a 5.4 it was a vaccuum leak. Follow the tube from the PCV to the back of the intake, pul off the elbow and quite often theres your problem, looks just like that picture. Ford doesn't sell just the elbow, had to pay $60 fo the PCV, tube and elbow.
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  #12  
Old 05-31-2010, 06:45 PM
glc glc is offline
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Ah, but Ford DOES sell just the elbow - JBrew has posted many times on this in the V-8 forum.
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  #13  
Old 05-31-2010, 07:45 PM
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Originally Posted by glc View Post
Ah, but Ford DOES sell just the elbow - JBrew has posted many times on this in the V-8 forum.
Well up here in small town canada they said not, I,ll grill him next time in
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  #14  
Old 06-19-2010, 06:13 PM
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Swine: I think I found my problem on my Mom's truck. After replacing the PCV valve and checking hoses, I finally found what you had replaced. It is on the very back, passenger side, of the intake manifold. The hose was literally ripped in two. There was no crack to speak of. LOL I replaced the hose and used a 90 degree elbow to make it easier to install. Thanks for the tips on this. Hopefully this will take care of that pesky P0171 and P0174 code.
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  #15  
Old 06-19-2010, 11:25 PM
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I think I spoke too soon gang. After driving about 45-50 miles round trip with no problem. I stop at Wal Mart to get some things, when I get ready to leave the CEL came back on. The idle started acting up some while at the stop light too. It ran smooth and then started idling crazy. I actually had to put the truck in neutral so it wouldn't die. I will have to check the vacuum lines again and see something didn't come unplugged. Can't do it tonight...damn mosquitoes are too bad.
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Old 06-19-2010, 11:25 PM


 
 
 
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