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intermitted miss?

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Old Feb 7, 2010 | 09:40 AM
  #1  
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From: ontario can
intermitted miss?

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?

Frank
 
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Old Feb 7, 2010 | 10:55 AM
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From: Mi'kma'ki
how many miles on the injectors?
 
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Old Feb 7, 2010 | 11:14 AM
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From: Faibanks Ak.
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.
 
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Old Feb 7, 2010 | 11:33 AM
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From: ontario can
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.
 
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Old Feb 7, 2010 | 11:47 AM
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From: Faibanks Ak.
Does it seem to be consistant with a certain rpm. are you getting any smoke while it is missing, this can be hard to see at highway speed.
 
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Old Feb 7, 2010 | 11:55 AM
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From: ontario can
Yes its at a lower rpm(no tach) in o.d. I down shift run a higher rpm it clears up.
 
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Old Feb 7, 2010 | 12:15 PM
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From: Faibanks Ak.
What speeds is it doing it at and if you speed up does it go away.
 
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Old Feb 7, 2010 | 12:36 PM
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Iam doing around 55-60 in o.d drop down to 4th back off a little in rpms it goes away and I have to be loaded heavy empty it has never done it.
 
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Old Feb 7, 2010 | 01:09 PM
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From: Faibanks Ak.
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.
 
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Old Feb 7, 2010 | 01:37 PM
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From: ontario can
I dont think its lugging sure seens to rev high in direct its hard to tell with out a tach.
 
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Old Feb 7, 2010 | 01:55 PM
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From: Dairy, OR
Originally Posted by u.f.o
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.

Auto Meter 2888 - Auto Meter Performance Series Mini Tachometers - Overview - SummitRacing.com
 
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Old Feb 7, 2010 | 02:04 PM
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From: Faibanks Ak.
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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Old Feb 7, 2010 | 03:33 PM
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From: ontario can
Thanks Boys, I think I will look for a tach.


Frank
 
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Old Feb 7, 2010 | 06:41 PM
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From: Faibanks Ak.
I am 4000 miles from mine that is geared like yours, but anyone with a ZF5 and 3.55 gears can tell you what rpm's you are running at 55.
 
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Old Feb 7, 2010 | 07:02 PM
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Originally Posted by starmilt
I am 4000 miles from mine that is geared like yours, but anyone with a ZF5 and 3.55 gears can tell you what rpm's you are running at 55.
Gonna need the tire size too
 
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