loss of power and a miss - Ford Powerstroke Diesel Forum
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Old 09-07-2011, 09:19 AM
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loss of power and a miss

im referring to the truck in the sig.

truck starts up and runs great, until under a load. meaning going up a hill, accelerating, or pulling something. the truck just kinda boggs down and kinda has a lope/miss sound to it, but most of the time i really keep my foot in it it goes away and runs like a raped ape kinda like a nitrous button. but thats only if really put my foot into it. if i just gradually accelerate it will just keep missing with no power. its kinds like a gas engine with a carb the needs a tune up baddd!

though my up pipes might be leaking but then why do the symptoms go away if i keep my foot in it?? sounds like a electrical problem or hell i dont know i tested my hpop and it held 2750psi at wot. thats good for a 15* i think.

before this started i could run 31psi a wot, im lucky to get 22psi now.

BUT i dont think my etgs have changed

new icp fuel filter and many oil changes. been going on for a year almost, so its seen winter and summer fuel.


any ides??
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Old 09-08-2011, 07:54 AM
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Old 09-12-2011, 04:38 AM
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Old 09-27-2011, 10:38 PM
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Loss of power and a miss

Here are a few things that you need to check before you start changing parts:
1) Fuel pressure, should be 55 to 65 psi from the frame pump at idle.
2) Fuel flow, hook up a gauge to the fuel system and drive it where you know you have had problems and watch to see if the pressure fluctuates below 55 psi.
3) The up pipes on the 7.3L have been a serious problem. If you do not have the updated bellows kit I would pretty much guarantee that they are leaking.
4) The engine backpressure control solenoid in the turbo pedestal starts to leak internally allowing oil pressure to close the turbo exhaust valve cutting off exhaust flow. Disconnecting the actuating rod and taking it for a spin will allow you to see if it is the culprit.

After you try these items let me know what you find. I have many more trouble shooting techniques that you can try.
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