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  #16  
Old 09-20-2010, 04:39 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!

See that....Cold air intake problem my ass!!
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  #17  
Old 09-20-2010, 04:43 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!

In the words of "The Count": "Ah... Ah... Ahh"


I still want to go back to stock
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  #18  
Old 09-20-2010, 04:44 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!

Good god!! Really?
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  #19  
Old 09-20-2010, 05:07 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!

Indeed
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  #20  
Old 09-20-2010, 05:40 PM
More_Cowbell More_Cowbell is offline
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Default Re: If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!

Here's another thing you could do asweel is get the meshing like what is over the big hose and put it on that elbow and it won't wear through as fast
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It looks like someone attacked the front of the truck with a bedazzler.
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  #21  
Old 09-21-2010, 04:15 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 More_Cowbell View Post
Here's another thing you could do asweel is get the meshing like what is over the big hose and put it on that elbow and it won't wear through as fast
True.... I knew this thread needed more cowbell
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  #22  
Old 10-20-2010, 02:22 PM
Solo V8 4G Solo V8 4G is offline
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Default Re: If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!

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Originally Posted by TurdFX4 View Post
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.
the way you would check to see if it is CAI is by hitting it with a hammer with it running, if the engine idle straightens up then you can remove the CAI clean it with carb cleaner or brake parts cleaner and reinstall.
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  #23  
Old 11-07-2010, 01:55 PM
The B4000 The B4000 is offline
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Default Re: If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!

To the OP-you are the King!! Thanks for posting all the great pics. I am not very skilled in the mechanical department, but this was my problem as well and your step-by step solution was a Godsend as I was about to spend about $300 on a new MAF sensor.

I have an '03 Mazda B4000 and about 2 weeks ago the CEL came on. Took it in to the mechanic, who replaced the fuel filter (which it needed anyways). The first time around he did the smoke test and found no vacuum leak as he was certain there would be a leak somewhere. He also believed all the O2 sensors were fine and cleaned the MAF sensor as well, which led him to the fuel filter. Within a day or two, the CEL returned when my wife was driving it. The second time around I had it back to him, he still could not find the issue; he is also a very reputable mechanic where I live so he cleared the codes and the next day, CEL on. He advised me if the light came back on, which it would, it probably was the MAF sensor going. The truck was running fine-no misses, stalls, hisses, lack/loss of power or anything. He had told me what the codes were and with a little help from good old Google I found this site. This morning, I found the problem (same as noted above) as there is 3/4" gash on the topside of this infamous elbow. I replaced it with braided heater hose from NAPA ($1.69/ft for the high end stuff) as per the OP's advice and in about 10 minutes, I had replaced it. I followed all the steps as the OP suggested to do, then took it for about a 20 mile test drive and no CEL.

Here is the gash in my PVC elbow; I had to cut the end closest to the throttle body as it was welded on there pretty good (the cut in the bottom edge) from years of service. Thanks again for the solution to such a simple (but annoying) fix!! Feeling pretty good about myself that I was able to fix something a mechanic with 20 years experience was unable to-haha.
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  #24  
Old 11-10-2010, 11:19 PM
02'4.04x4 02'4.04x4 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 RandSand View Post
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!!!!
Old school, strategically spray WD40 along vac line areas at idle and you'll hear the idle shift when in the right spot otherwise check fuel pressure and plugs. Plugs are like a cheat sheet. HTH
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  #25  
Old 11-21-2010, 04:57 PM
221k 221k is offline
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Default Re: If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!

my ranger has kicked thos codes since it had about 80 k on it. I havent done anything but now im have a problem with my number 3 plug fouling.my head gaskets are leaking.and i have to replace the plug every 500 miles. Are there any quick fixes for his problem.I just need to get another 30 k out of engine.
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  #26  
Old 12-12-2010, 07:53 PM
kilich kilich is offline
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Default Re: If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!

My 2002 explorer with the 4.0L in it just threw these codes so I was looking under the 4.0L forums and I see the codes that it poped and I was reading this so I go run outside and my mom is like what are you doing, Any who, It was cracked. I had some smaller hose but I just heated the hose and made it fit for now till I get around to fix it, But thanks to this thread no more rough idle
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  #27  
Old 12-17-2010, 04:18 PM
caryrae73 caryrae73 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 have a 2001 Ranger 4.0 and had the 2 codes and just went out and looked and yup the elbow has a big gash in it. Now just have to go out and get a piece of hose to fix it. Will this possibly help with the rough idle I have? It seems to be fine when driving any speed just when idling it will idle rough and sometimes even stall and the engine will shake a little. Seems to be worse after the engine as warmed up.
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  #28  
Old 12-17-2010, 04:28 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!

mine does that from time to time especially when the heat is on, but you will notice a slight difference
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  #29  
Old 12-17-2010, 04:48 PM
caryrae73 caryrae73 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 say 5/8" hose fits snug, how snug? A store near me has 19/32" hose which I would assume will fit since it is only 1/32" smaller then 5/8".
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  #30  
Old 12-17-2010, 05:15 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!

get both and see which is the better fit. Its cheap enough
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elbow, lean codes, o2 sensors, pcv, po171, po174

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