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  #76  
Old 12-26-2012, 09:46 AM
sammyjohn sammyjohn 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 1999 with those codes. Think I will check thoss hoses today!
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  #77  
Old 12-26-2012, 09:48 AM
djfllmn djfllmn is offline
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Quote:
Originally Posted by sammyjohn View Post
I have a 1999 with those codes. Think I will check thoss hoses today!
You don't have those hoses

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  #78  
Old 12-26-2012, 09:51 AM
sammyjohn sammyjohn 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 oregonhighgp View Post
try checking your upper intake manifold gaskets,their are 3 gaskets that needs to be replace,4.0 have a problems as the gaskets get old ( leaking ). 22.00 bucks for the kit. 3 to 4 hrs. work time
How do you check a gasket, without pulling everything on top?
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  #79  
Old 01-13-2013, 02:34 PM
hogmoss hogmoss 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 '98 Mazda B4000, same codes as listed here. I have changed the fuel filter, plugs, wires, MAF. After changing all of the above it ran significantly better for a few weeks, CEL remained on the whole time. Yesterday it started riding rough again.

Symptoms: Rough idle, stuttering during low rpm acceleration. If I give it more gas during acceleration it smooths out. I looks for the hoses listed in the pics in the beginning of this thread but did not see those. I replaced the vacuum line that comes off the EFI control box (not sure if that's what it really is) on the driver side of the truck that runs into the throttle body; I also replaced the 5-6 inch vacuum line at the back of the driver side cylinder that also plugs into the throttle body. Neither of these have fixed it.

The guy at the parts house says that he thinks it an O2 sensor, thoughts? Any help will be greatly appreciated, really struggling to get this fixed.

Steve
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  #80  
Old 01-23-2013, 05:30 PM
king27 king27 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'm really glad you posted this! i just replaced the o2 sensor for my 99' ranger because it popped up on my scanner, along with both these codes. replaced the o2 sensor and everything was great for a couple of miles till the "check engine" light came back on... scanned it again and it only read these 2 codes. i'll look more into what you showed me here tomorrow when i have some daylight. Thanks again!!
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  #81  
Old 01-23-2013, 09:24 PM
Jfuentes Jfuentes is offline
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Default Re: If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!

Wats up guys I own a 99' 2.5L SOHC had code p0171 and at times the p0174 as well have my Matco scanner keep checking it but have no luck getting rid of it I've done the following to it..... Both O2 sensors being a So Sohc it only has bank 1 anyway changed them my self however I replaced them with 'Denso' ones, around $50 each Motorcraft was looking at a out $120 a piece... changed my fuel filter... a couple of air vacuum hoses that looked beat up did do the Carb test with no luck though... changed my MAF sensor a couple of times already and I do recall feeling differences in between changes... have gotten PCV valved changed even the hose that comes with it... I have gotten out my EGR valve to get clean as well n still have no luck... I have replaced a gasket on my pipe right after catty it was bad an licking from there... haven had any luck yet getting rid of my CEL but have made my truck run better n increase MPG. ANY HELP WILL BE GREATLY APPRECIATED THANKS....
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  #82  
Old 02-07-2013, 12:31 AM
cologc46 cologc46 is offline
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Default Re: If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!

Check engine light came on about two months ago. I had autozone pull my check engine code and the sales guy there immediately was selling me oxy sensors and spark plugs. My 2002 Ranger (4.0L) has about 110K miles on it, mostly all highway miles. Anyway, I told the autozone guy, not today on the parts, knowing I would check the forums first.

I found this forum and low and behold, the #1 sticky thread is the p0174 code. I pulled the L shaped vacuum hose and inspected it. It looked to be intact, but knowing it was 10+ years old I went back to autozone and got a piece of vacuum hose. I replaced the hose, pulled the battery cable to reset the codes, and have drove it for 2 months. The p0174 has not come back. Yea!!! Thanks guys for saving me some big $$ and hassle of diagnosing what would have been a bitch to figure out. Thanks thanks thanks.
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  #83  
Old 02-10-2013, 10:05 AM
taconic taconic 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 don't see any of those vacuum lines(as photographed) on my '98 4.0L(build date 12/97)!!! I've go the CE light coming on showing L and R banks "lean."
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  #84  
Old 02-10-2013, 10:51 AM
01_ranger_4x4 01_ranger_4x4 is offline
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Quote:
Originally Posted by taconic View Post
I don't see any of those vacuum lines(as photographed) on my '98 4.0L(build date 12/97)!!! I've go the CE light coming on showing L and R banks "lean."
It's because this thread is specifically for the 01+ SOHC 4.0. It's different than your 98

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  #85  
Old 03-02-2013, 11:21 PM
aodha aodha is offline
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I had this problem and used a rubber hose. And about a year later that rubber hose isn't holding the vacuum pressure. I'm about to go but the real elbow piece from the auto parts store.
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  #86  
Old 03-13-2013, 02:17 PM
Yellowhousejake Yellowhousejake is offline
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Default Re: If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!

HA! Thanks. I had the same rough idle issue and found the hose worn through. Changed it and everything is great again. I did change plugs though and found all six were very worn with gap over .125. It simply would not have run without a computer.

This is the second time this forum has given me the solution, the first time was the right track on changing a fuel pump a year ago.

I joined the forum today.

Thank you all.

DAve
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  #87  
Old 03-18-2013, 06:58 PM
Jimmyaf Jimmyaf 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 Fordified View Post
I have a 2000 Ford Ranger 4x4 extended cab with an automatic trans that has displayed bank 1 and bank 2 lean codes, as well as #6 cyinder misfire. I replaced the plugs and still had the same codes, so I replaced the spark plug wires and when I checked the codes today it came up bank 1 lean and #3 cylinder misfire. I find no vacuum leaks visually, as well as spraying starting fluid around manifold and hoses. I have to think it is probably still a vacuum leak, due to the fact that it dropped the Bank 2 lean, and the fact that the cylinder misfire went from #6 to #3. Any ideas.
Did you get this Fixed? I have a '02 Sable that though it was the 3.0 it has the same elbow off the pcv that was bad. I bought it cheap because of the rough idle assuming it was just a vac leak but the guy had ignored the CEL and ran it lean till it burnt the exhaust valve on the #6 cylinder giving me a misfire. A quick compression test will tell you if it's that bad. At least it would be easier than my DOHC motor to do the valve job.
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  #88  
Old 03-20-2013, 01:58 PM
DirtyD925 DirtyD925 is offline
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Default Re: If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!

hahaha exactly what mine was good post!

----------

i used a coolant hose not 100% sure how well its working though seems to fit fine but im still having some issues while idling
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  #89  
Old 03-21-2013, 01:25 PM
jakimbral jakimbral is offline
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Default Re: If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!

Found out that this elbow is what the problem if on mine, after I changed out the MAF senor (of course). Replacing it tonight or tomorrow. Does anyone know if it is easier to get the new on than it is to get the old one off?
Thanks
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  #90  
Old 03-22-2013, 05:50 AM
TXCOMT TXCOMT 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 jakimbral View Post
Found out that this elbow is what the problem if on mine, after I changed out the MAF senor (of course). Replacing it tonight or tomorrow. Does anyone know if it is easier to get the new on than it is to get the old one off?
Thanks
It's kind of a pain to get the old one off; I had to use a knife to cut it. The new piece should be a breeze! Just put a little dishwasher soap or lithium grease on inside ends of the hose and it should slip on easily.

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

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