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My 7.3 has a intermittent miss with a good load on, or with my camper on. It will do for a little while and be fine, mostly in o.d. (t19 & g.v.). Empty it does do it. Any ideas?
When it misses is it a light miss and fell like just one cylinder is missing. (possible injector)
The only real difference between loaded and empty is the amount of fuel needed.
If it seems like a harder miss I would suspect a small air leak between the tank and pump or maybe an obtruction in the fuel system.I assume you have changed the filter, so maybe a weak pump. I would run a pressure and volume test on it.
Have you noticed if it acts the same on both tanks.
The engine suppose to have around 200k on it took out of donour truck (its second engine). The pump looks to be orginal. Runs real well 99% of the time, and it does matter what tank its on it will do it. I drop into 4 out of o.d. and it goes away.
Is it a chance nothing is wrong but it is lugging at those speeds with a load on it.
55 in overdrive with 3.55 is pretty low rpm's to be trying to pull loads with, try speeding up to 70 or 75 and see how it runs.
I dont think its lugging sure seens to rev high in direct its hard to tell with out a tach.
If you do a lot of hauling it sure would make sense to invest in a tach so you know what that thing is really doing. Wreckinball put one in his that just hooks up to the alternator... so easy hookup... I think the link is.
At 55 you are not revving high it just sounds like it. I have the same setup as you and she runs real smooth at 75, it runs smooth at 55 but is turning to low to be pulling a load.
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