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Going Lean cutting out misfire

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Old 11-03-2011
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Going Lean cutting out misfire

I have no CEL for a misfire or anything that would cause this symptom only a P0530. The o2's are reading correct voltage. When i accelerate on the highway it cuts out almost like a misfire, i know for sure it's not one almost feels like its going to lean. When i get on the skinny harder it down shifts and goes away.
 
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Old 11-03-2011
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MAF.
Clean and or Check it.
 
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Old 11-03-2011
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First thing I did. It's brand new so that's eliminated
 
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Old 11-03-2011
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Originally Posted by 04RangerDave View Post
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First thing I did. It's brand new so that's eliminated
New parts aren't always new.
Case in point, just recently, my GN started misfiring under load, a lot like your truck. I had just put a new MAF on it (as the first thing). I then proceeded to throw about 3k at the car trying to figure out what was wrong, turns out my "new" MAF was bad from the factory.
 
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Old 11-03-2011
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Originally Posted by StxDangerRanger
Originally Posted by 04RangerDave View Post
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First thing I did. It's brand new so that's eliminated
New parts aren't always new.
Case in point, just recently, my GN started misfiring under load, a lot like your truck. I had just put a new MAF on it (as the first thing). I then proceeded to throw about 3k at the car trying to figure out what was wrong, turns out my "new" MAF was bad from the factory.
Im gonna test it see if it's defective. But I assure it's fine
 
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Old 11-03-2011
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Originally Posted by 04RangerDave View Post
I have no CEL for a misfire or anything that would cause this symptom only a P0530. The o2's are reading correct voltage. When i accelerate on the highway it cuts out almost like a misfire, i know for sure it's not one almost feels like its going to lean. When i get on the skinny harder it down shifts and goes away.
Have you checked all vacuum hoses and the attached components for a good connection? SOHC 4.0's are somewhat known to develop a leak in the bends on that semihard plastic hose attached to the PCV (hole burns through the plastic and it likes the bends). I've seen holes on the front side 90*, and on the back side 90*. Me hasn't looked into the P0530 cuz I'm not sure if you've done a visual on it yet.

And although the MAF may not have been the cause of the problem, it is very true that just because a part, any part, is new doesn't mean it's good. It's just a $1XX part that maybe didn't need replacing at this point.
 
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Old 11-03-2011
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Originally Posted by CowboyBilly9Mile
Originally Posted by 04RangerDave View Post
I have no CEL for a misfire or anything that would cause this symptom only a P0530. The o2's are reading correct voltage. When i accelerate on the highway it cuts out almost like a misfire, i know for sure it's not one almost feels like its going to lean. When i get on the skinny harder it down shifts and goes away.
Have you checked all vacuum hoses and the attached components for a good connection? SOHC 4.0's are somewhat known to develop a leak in the bends on that semihard plastic hose attached to the PCV (hole burns through the plastic and it likes the bends). I've seen holes on the front side 90*, and on the back side 90*. Me hasn't looked into the P0530 cuz I'm not sure if you've done a visual on it yet.

And although the MAF may not have been the cause of the problem, it is very true that just because a part, any part, is new doesn't mean it's good. It's just a $1XX part that maybe didn't need replacing at this point.
I have the new pcv hose it's got wrinkles in it kind of like a drier hose just more rigid. All the parts I get are at cost so it wasn't near $1xx lol. Also the MAF I tested and it came on NON-DEFECTIVE.
 
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Old 11-03-2011
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Originally Posted by 04RangerDave View Post
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I have the new pcv hose it's got wrinkles in it kind of like a drier hose just more rigid. All the parts I get are at cost so it wasn't near $1xx lol. Also the MAF I tested and it came on NON-DEFECTIVE.
Then check the usuals. plugs, wires. coil pack.
how are all those and when was the last time you replaced any of it?
 
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Old 11-03-2011
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sounds normal to me. i mean... this is dave's truck we're talking about here.
 
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Old 11-03-2011
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Originally Posted by StxDangerRanger View Post
Then check the usuals. plugs, wires. coil pack.
how are all those and when was the last time you replaced any of it?
Recent work
Plugs are Motorcraft installed 2 weeks ago.
Wires are MotorCraft ^
Coil Pack tested fine
PCV 2 months ago with new hose
Motorcraft fuel filter
Bank 2 sensor 2 o2 replaced

Originally Posted by SteelDirigible View Post
sounds normal to me. i mean... this is dave's truck we're talking about here.
Not normal and neither is my truck
 
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Old 11-03-2011
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I doubt it, but i'm throwing it out there since its your truck,
Could be a cam lobe starting to go, but i HIGHLY doubt it.
 
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Old 11-03-2011
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Originally Posted by StxDangerRanger View Post
I doubt it, but i'm throwing it out there since its your truck,
Could be a cam lobe starting to go, but i HIGHLY doubt it.
Never heard of such a thing on a sohc 4l
 
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Old 11-03-2011
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Originally Posted by 04RangerDave View Post
Never heard of such a thing on a sohc 4l
Ive never seen it in person, but i've heard stories (a friend of a friends car, etc) that all it takes is a dimple to form, and that will make that cylinder misfire.
 
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Old 11-03-2011
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Try removing your tune as well. Alot of your issues could be a culprit of a poor tune. Not sure who wrote it, but even NASA screws up now and again.
 
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Old 11-04-2011
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Tune was removed. And Doug did them
 
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