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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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Old 02-27-2010
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Icon13 lean codes...sigh

alrighty guys, i know i know did you search first.... YES, but i have so other things as well.


i got the P0171 and 0174 codes...lean in both banks. im also having idle issues. when i stat it, its good until the idle drops to around 750(normal) but then dives well under 500 and nearly dies... ocasianaly it will, even at a stop light. im also having cold start issues, when i havnt drove the truck in about a half hour i have to crank on it for a while, or prime the pump 2-3 times(clicking the key on and off before starting). altho i think it may be somthing else like a check valve in the pump. this proble has been ongoing for quite longer than the codes. im also getting **** poor mileage, but its a sohc on 33's and stock gears...

thoughts, direction, and help are well welcomed!
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Old 02-27-2010
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The hose underneath the radiator hose that leaks? What you are describing is exactly what mine was doing, that hose was leaking, fixed it, and is perfect now.
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Old 02-27-2010
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yep its the fresh air PCV hose. Very common problem Search the code in the search engine and you should get a how to
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Old 02-27-2010
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this is under the upper rad hose?
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Old 02-27-2010
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My mom's explorer has the same codes. Never could find the leak
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Old 02-27-2010
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its under the upper radiator hose by the throttle body, the upper hose rubs through on the hose elbow
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Old 02-28-2010
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ah gotcha ill hit that up tomorrow. thanks for the help.
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Old 02-28-2010
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fixed. i also cleaned iac,maf, and t.body. runs much much smother. i will have a write up later on the fix for others in the future. thanks again guys
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Old 02-28-2010
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Awesome. I would like to see it.
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Old 03-01-2010
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can anyone tell me where this elbow would be on a 95 4.0. I've looked at a few of the tutorials but they all seem to have the pcv near the throttle body but I'm not seeing on my truck but i'm having the same symptoms. Rough idle lean codes in both banks P0171 and P0174. I cleaned my maf and that didn't seem to do anything for me. Any help is appreciated
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Old 03-01-2010
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Quote:
Originally Posted by 07wrxwag View Post
can anyone tell me where this elbow would be on a 95 4.0. I've looked at a few of the tutorials but they all seem to have the pcv near the throttle body but I'm not seeing on my truck but i'm having the same symptoms. Rough idle lean codes in both banks P0171 and P0174. I cleaned my maf and that didn't seem to do anything for me. Any help is appreciated
95 would be a pushrod or cologne 4.0, which does not have this elbow..the pcv valve is on the rear of the drivers side valve cover ( i beleive)
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Old 03-01-2010
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Quote:
Originally Posted by Toreador4x4 View Post
95 would be a pushrod or cologne 4.0, which does not have this elbow..the pcv valve is on the rear of the drivers side valve cover ( i beleive)

hmm then thats probably not my problem. Doh I was hoping it would be something simple. with 218k I really don't want to start throwing parts at it
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Old 03-01-2010
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check the pcv and all gasket areas between the throttle body and the heads (throttle body gasket, iac gasket, upper intake gaskets, pcv, vacuum lines off the intake etc)
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Old 03-01-2010
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I did a really good writeup for people with problems like this on adaptive fuel diagnosis techniques that would probably help you but the damn mods never stickied it like they should have.
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  #15  
Old 03-02-2010
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Quote:
Originally Posted by Toreador4x4 View Post
check the pcv and all gasket areas between the throttle body and the heads (throttle body gasket, iac gasket, upper intake gaskets, pcv, vacuum lines off the intake etc)
Well I found the issue. I used a trick from my turbo vw days and induced alittle pressure (7 psi) into the intake system and found my leak. But as I was looking through my Haynes manual I realized I have a pushrod v6 so I wasn't sure if theres a better place for me to post but here is a picture of the problem. I believe it has to do with the EGR

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that little sucker just pisses air out. All the other hoses and lines seem good although there could be other problem area's once the area is actually able to pass that section. Any experience with fixing this seal?
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Old 03-02-2010
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im pretty sure that large line you are pointing to is for the A/C
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Old 03-02-2010
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Originally Posted by Toreador4x4 View Post
im pretty sure that large line you are pointing to is for the A/C
opps I guess my arrow didn't come out so well the line that I am referring to is the metal hard pipe that is right behind the AC pipe. The metal pipe is question goes from the Intake manifold to the left header. I believe its for the EGR system? I'm thinking about just mixing up some jbweld and sealing that sucker up.
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