Anyone have injector balance rate specs? - Ford Powerstroke Diesel Forum
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Old 01-16-2013, 07:29 PM
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Anyone have injector balance rate specs?

I looked at a 1999 F250 7.3 today. The owner said the truck has always had a "miss in it" every since he got it. He has owned it for 3 years. He says it misses in the "lower rpm range" and it "isn't very noticeable" but he would like to get it fixed because it annoys him. There are no active codes, and no codes stored in the memory. I checked the balance rates. Nothing appeared out of the ordinary except for cylinder 8. It was way higher than the other 7 cylinders. It was consistently running between 4.8 and 5.0. The other 7 were between .1 and 2.1. Anyone know how high they need to be before they are considered bad? I could not hear any fuel knocking at any rpm.
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Old 01-18-2013, 03:49 AM
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anyone?
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Old 01-18-2013, 07:19 PM
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number 8 balance rate will always differ from the rest, as it is the long lead. if you think number 8 is causing the miss, remove the valve cover, run it, and disconnect the number 8 injector. see if the idle remains the same
can you monitor icp and ipr?
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Old 01-19-2013, 04:47 PM
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Quote:
Originally Posted by kaya@bernhausen View Post
number 8 balance rate will always differ from the rest, as it is the long lead. if you think number 8 is causing the miss, remove the valve cover, run it, and disconnect the number 8 injector. see if the idle remains the same
can you monitor icp and ipr?
I think I can. I borrowed this from my buddy. It does alot of stuff. I just havent figured out how to do half of the stuff it is able to do.
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Old 01-19-2013, 08:49 PM
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the ethos will allow you to view icp and ipr. what you want to look for is high ipr duty cycle with lower than average icp at idle and low rpm. somewhere around 80% ipr duty cycle would be considered high. if you have those criteria, i'd say the pump is probably weak
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Old 01-21-2013, 03:39 AM
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Quote:
Originally Posted by kaya@bernhausen View Post
the ethos will allow you to view icp and ipr. what you want to look for is high ipr duty cycle with lower than average icp at idle and low rpm. somewhere around 80% ipr duty cycle would be considered high. if you have those criteria, i'd say the pump is probably weak
I will check it out and let you know. thanks
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Old 01-21-2013, 04:19 AM
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Re: Anyone have injector balance rate specs?

Number 8 also does that cause of CPS

I made my Samsung SGH-I997 send this.
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Old 01-21-2013, 08:54 AM
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Quote:
Originally Posted by jesilvas View Post
Number 8 also does that cause of CPS

I made my Samsung SGH-I997 send this.
Does it. Read high because of a bad Cps or is it normal to read high because of cps?
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Old 01-21-2013, 09:31 AM
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Re: Anyone have injector balance rate specs?

Quote:
Originally Posted by DieselMechanic87 View Post
Does it. Read high because of a bad Cps or is it normal to read high because of cps?
http://www.thedieselstop.com/forums/...s-test-257398/

I made my Samsung SGH-I997 send this.
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Old 01-21-2013, 05:57 PM
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Quote:
Originally Posted by jesilvas View Post
Thanks for the info. I was about to recommend changing an injector. I am reading high perdels on the same cylinders as him.(#3 and #8) Most likely have the same issue.
Here is his perdels:
cylinder:
#1 - 1.1
#2 - 0
#3 - 2.8
#4 - .9
#5 - 0
#6 - 0
#7 - 0
#8 - 6.6

this is his son in law's truck (it is an 02')
#1 - 1.3
#2 - 0
#3 - 0
#4 - 1.5
#5 - 2.8
#6 - 0
#7 - 0
#8 - 2.0
I also checked icp and ipr on his truck:
icp (v): .80
injection control pressure: 490 psi
injection pressure regulator: 12%
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