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  #1  
Old 01-16-2014, 04:20 PM
jjvm90 jjvm90 is offline
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Default p1071 and p1074

So I have had this CEL on for about 2 years and am finally doing something about it, I've read all over the forum regarding this issue but so far nothing has worked, The code pops up every 5-60miles, If I floor the gas pedal it seems to come on alot quicker, so far I have put brand new o2 sensors in bank 1 and 2, cleaned MAF, IAC is pretty new( 20k miles max) new fuel filter, fuel pump replaced about 20k go as well, checked PVC elbow and it is fine, checked MAF with multimeter everything looked good, dont notice any vacuum leaks, New plugs and wires(20k) I have a K&N CAI on so I dont know if that has anything to do with it, anyone have any pointers of where to look next? I am limited on money so prefer to do all I can before finding a mechanic, only thing I can think of is if one of the cats is bad? Should I do seafoam? Thanks!
Also my code reader reads p1071 and p1074 PENDING(120k miles on truck)
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  #2  
Old 01-16-2014, 04:24 PM
RangerSchool RangerSchool is offline
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Default Re: p1071 and p1074

Quote:
Originally Posted by jjvm90 View Post
So I have had this CEL on for about 2 years and am finally doing something about it, I've read all over the forum regarding this issue but so far nothing has worked, The code pops up every 5-60miles, If I floor the gas pedal it seems to come on alot quicker, so far I have put brand new o2 sensors in bank 1 and 2, cleaned MAF, IAC is pretty new( 20k miles max) new fuel filter, fuel pump replaced about 20k go as well, checked PVC elbow and it is fine, checked MAF with multimeter everything looked good, dont notice any vacuum leaks, New plugs and wires(20k) I have a K&N CAI on so I dont know if that has anything to do with it, anyone have any pointers of where to look next? I am limited on money so prefer to do all I can before finding a mechanic, only thing I can think of is if one of the cats is bad? Should I do seafoam? Thanks!
Also my code reader reads p1071 and p1074 PENDING(120k miles on truck)
if you are sure you don't have a vacuum leak or a leak/crack in the air intake then I would install a new MAF.

FYI if all you get is those two codes at the same time then it would not be the o2 sensors.
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Old 01-16-2014, 04:44 PM
jjvm90 jjvm90 is offline
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Default Re: p1071 and p1074

If the MAF were bad would I pull codes for that ? the damn things are expensive any recommended brand?
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Old 01-16-2014, 05:38 PM
RangerSchool RangerSchool is offline
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Default Re: p1071 and p1074

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Originally Posted by jjvm90 View Post
If the MAF were bad would I pull codes for that ? the damn things are expensive any recommended brand?
I must have missed the part about the K and N filter in your first post. I would remove that and install the stock one correctly. then see what happens.

A lot of times when you have a bad MAF all you get are those 2 lean codes.

try the redneck Dx technique and disconnect the maf and see how the truck runs. it should run like crap and eventually stall.

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Quote:
Originally Posted by jjvm90 View Post
If the MAF were bad would I pull codes for that ? the damn things are expensive any recommended brand?
Motorcraft are always best. I think they are $120 on rockauto. Since the repair takes 5 minutes you could always get an aftermarket one and see what happens or try a junkyard!

What's the history with the truck and the k and n filter. Has the filter always been on? Has the cel always come on?
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Last edited by RangerSchool; 01-16-2014 at 05:40 PM.
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Old 01-16-2014, 08:17 PM
jjvm90 jjvm90 is offline
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Default Re: p1071 and p1074

Ill have to go check out a local junk yard I tossed my old intake 8 years ago , the cel wasnt on before I put the K&N on but I dont remember how soon after the swap it came on or if i changed the maf when I swapped it, tried the redneck method the truck didnt stall it just lowered the idle and threw some maf input cel codes, thanks for your help ill see what i can find
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  #6  
Old 01-16-2014, 08:26 PM
Jaws Ranger Jaws Ranger is offline
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K&N won't mess it up so stop hating on it, your MAF is just a dud
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Old 01-16-2014, 08:43 PM
RangerSchool RangerSchool is offline
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Quote:
Originally Posted by Jaws Ranger View Post
K&N won't mess it up so stop hating on it, your MAF is just a dud
Know & Nothing are useless and they mess with the truck, especially when they are installed wrong.
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  #8  
Old 01-16-2014, 08:49 PM
Jaws Ranger Jaws Ranger is offline
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I doubt that 20 million people would buy a filter that ruins the car, yes the oil gets sucked it but in such micro impounds that it doesn't make a difference

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And how can someone install it wrong??
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  #9  
Old 01-16-2014, 09:03 PM
RangerSchool RangerSchool is offline
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Quote:
Originally Posted by Jaws Ranger View Post
I doubt that 20 million people would buy a filter that ruins the car, yes the oil gets sucked it but in such micro impounds that it doesn't make a difference

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And how can someone install it wrong??
I think there were more than 50,000,000 German Nazis that followed Hitler! They were wrong! Doctors used to tell us smoking cigarettes was good for our health. WRONG!

I think he has the intake setup? I have seen many incorrect installs on aftermarket intakes. i.e. MAF leaking, silicone mess, or installed backwards, etc. I can not DX this issue properly over the internet without the stock intake in place. If the truck was in my shop i might be able to do with the aftermarket intake. My Best guess is the MAF. Anyways it's all yours!
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Last edited by RangerSchool; 01-17-2014 at 08:09 AM.
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  #10  
Old 01-17-2014, 10:36 AM
jjvm90 jjvm90 is offline
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Default Re: p1071 and p1074

Im sure its installed correct everywhere but I lost a bolt that kind of braces the Intake from underneath but its before the maf and is small screw size ill get a new one and start there, its not over oiled and I let it dry a day before putting it back on
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  #11  
Old 01-17-2014, 12:33 PM
cvar cvar is offline
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Default Re: p1071 and p1074

On mine, I got those same 171/174 codes cuz of intake manifold gasket leak. Engine would sometimes stall when idling in cold weather. New gasket fixed it. First, did you check all of your vacuum hoses for leaks?

BTW, you can measure your MAF output with a simple voltmeter. Same for DPFE output.
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  #12  
Old 01-18-2014, 02:41 PM
jjvm90 jjvm90 is offline
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Default Re: p1071 and p1074

yeah Ive checked everywhere for leaks with carb spray and nothing changed my idle, I have never stalled though I do feel like when I floor the gas there's a lack of power or just slower reaction, other than that the truck runs good IMO, I also checked each wire on the maf with a multimeter and they all pulled 12v except one that was starting around 70 and steadily climbing up to 80s idk what that means though
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  #13  
Old 01-18-2014, 02:50 PM
Jaws Ranger Jaws Ranger is offline
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What about TPS
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  #14  
Old 01-18-2014, 03:14 PM
jjvm90 jjvm90 is offline
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Default Re: p1071 and p1074

also pretty new around 20k miles
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  #15  
Old 01-19-2014, 07:17 AM
sh8zen sh8zen is offline
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Default Re: p1071 and p1074

Doesn't sound like a clogged cat to me, the maf will sense and compensate somewhat for that and if it's beyond the limits of the pcm to compensate, you'd hardly make freeway speed... you prolly would have mentioned that.

Doesn't sound like a vacuum leak either. They are usually more pronounced at idle than under a load which is where you are having the issue.

Have you cleaned your fuel injectors. Maybe the pcm is scheduling the proper amount of fuel to keep it from going lean but partially clogged injectors are inhibiting the delivery of the fuel to the point of causing it to run lean.

You can clean them yourself for very little $$, search videos to see how.

Have you checked fuel pressure? if it's low, that can cause a lean condition.

Ultimately, it's either getting less fuel than the pcm thinks it is (low fuel pressure, clogged injectors, etc), or it's getting more air than the pcm thinks it is (inaccurate MAF, vac leak, etc).

Do you have access to a scan tool? if so, put one on next time a P0171/4 triggers and post the freeze frame data for us to look at. I'm curious to know what your fuel trims are.
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