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  #1  
Old 08-06-2010, 03:39 PM
01_ranger_4x4 01_ranger_4x4 is offline
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Exclamation If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!

These two codes normally indicate a vacuum leak. a vacuum leak can be caused by a number of things but the most common cause in the 01+ SOHC 4.0L is a cracked PCV vacuum line elbow. so if you have one or both of these codes popping up check this out first.

the elbow is located just to the left of the throttle body just under where the upper radiator hose snakes around the oil fill, grab that hose and pull it over the oil fill



That will uncover the elbow so you can see it better. (mine looks a little different because its been replaced before)


the stock elbow will look like this



now that you have located the elbow pull it off of the lines its attached to and examine it for cracks or holes. Now if you determine that the elbow is bad you have a couple options to fix it. The first and most expensive option would be to buy an OEM replacement elbow that costs about $15.00 from Ford (part# F8UZ-6762-AA) or you could do as i did and go to the local auto parts store and pay a couple bucks for about 6" of 5/8" ID gas and oil safe rubber hose. Trim it to length if needed after a test fit and install it. I didnt use hose clamps to hold mine on because the rubber hose fit snuggly over the lines but you can use them if you wish. Once that is done dont forget to put the upper coolant hose back where it is supposed to be, disconnect the battery or use your code scanner to reset your check engine light and your done!

If anyone would like to add any additional pics or tips to this thread feel free.
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  #2  
Old 08-06-2010, 03:45 PM
STL STL is offline
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Default Re: If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!

Great info seems to be a common problem
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  #3  
Old 08-06-2010, 04:14 PM
01purpleranger 01purpleranger is offline
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Default Re: If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!

Sweet buddy thanks for the help!
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  #4  
Old 08-10-2010, 01:42 PM
lisahelms1 lisahelms1 is offline
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Default Re: If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!

Awesome, I had a huge gash in mine. Thank You very much for the help!
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  #5  
Old 08-10-2010, 02:35 PM
Clinton Clinton is offline
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Default Re: If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!

Very cool write up!!
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  #6  
Old 08-10-2010, 02:59 PM
TurdFX4 TurdFX4 is offline
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Default Re: If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!

mine occassionally throws the code for "Vaccum System small leak" or something like that. It only started after I did the body lift. I figured it was something to do with the filler neck modification
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  #7  
Old 08-16-2010, 05:00 PM
RandSand RandSand is offline
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Default Re: If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!

Great write up. Did not work for me as my elbows looked good back and front. What is the best way to check for vac leaks? I have read carb cleaner. Anything else that might set off these codes?? Thanks!!!!
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  #8  
Old 09-15-2010, 03:56 PM
TurdFX4 TurdFX4 is offline
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Default Re: If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!

Mine just threw the codes for lean bank 1 and 2, mechanic said it might be the CAI with it all of a sudden getting colder out, the colder denser air may effect it.
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Old 09-15-2010, 04:43 PM
Clinton Clinton is offline
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Default Re: If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!

Dude I have a CAI and no codes, I dont think it could be that after thinking about it
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  #10  
Old 09-16-2010, 07:06 PM
TurdFX4 TurdFX4 is offline
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Default Re: If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!

Quote:
Originally Posted by Clinton View Post
Dude I have a CAI and no codes, I dont think it could be that after thinking about it
I honestly dont know. maybe i do have a leak somewhere. It only started coming on after the Body Lift
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  #11  
Old 09-16-2010, 07:07 PM
Clinton Clinton is offline
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Default Re: If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!

you check that 90 intake hose?
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  #12  
Old 09-16-2010, 10:58 PM
4evermodding 4evermodding is offline
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Default Re: If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!

yea mine threw them their codes and i checked the pvc and had to plug the end of the plastic fitting, I have just changed it but forgot that the aftermarket ones have a second plastic end that needs to be plug, WALLA!
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  #13  
Old 09-18-2010, 08:28 AM
TurdFX4 TurdFX4 is offline
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Default Re: If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!

Quote:
Originally Posted by Clinton View Post
you check that 90 intake hose?
I just did, it is cracked!
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  #14  
Old 09-18-2010, 08:36 AM
Clinton Clinton is offline
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Default Re: If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!

Quote:
Originally Posted by TurdFX4 View Post
I just did, it is cracked!
There ya go man!! Get a replacement at lowes or home depot and you are set!!!
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  #15  
Old 09-20-2010, 04:36 PM
TurdFX4 TurdFX4 is offline
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Default Re: If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!

I just fixed it, here's what mine looked like:

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elbow, lean codes, o2 sensors, pcv, po171, po174

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