KOER Questions
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Cargo Master
Joined: Sep 2015
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KOER Questions
Hey guys i was doing a koer test today on my truck and noticed when the test starts the engine runs very rough. Just was wondering if that is normal?
while doing the test in got a p0476 exhaust pressure control valve range / performance code. tried looking into some other threads on that code but they were kinda dead ends. anyone know what causes this code?
So i was wondering if my ebp butterfly was working properly, i ran the koer test again and got in there to watch the butterfly close. the actuator rod does move and it looks like its connected to the butterfly but i don't hear anything different other than the engine rpms go up. from other threads i have read, they said it was a VERY noticable when the butterfly closes, ive heard some people say it sounds like a loud jet engine. I don't hear anything of the sort. Is it possible that the butterfly is broke some how and not closing? i can see it move but maybe its broke internaly? It finally got into the 30's here in florida and i noticed that the truck does raise the rpms in order to warm up but the rpms surge up and down. not sure if that has anything to do with it or not. thanks for any input guys
while doing the test in got a p0476 exhaust pressure control valve range / performance code. tried looking into some other threads on that code but they were kinda dead ends. anyone know what causes this code?
So i was wondering if my ebp butterfly was working properly, i ran the koer test again and got in there to watch the butterfly close. the actuator rod does move and it looks like its connected to the butterfly but i don't hear anything different other than the engine rpms go up. from other threads i have read, they said it was a VERY noticable when the butterfly closes, ive heard some people say it sounds like a loud jet engine. I don't hear anything of the sort. Is it possible that the butterfly is broke some how and not closing? i can see it move but maybe its broke internaly? It finally got into the 30's here in florida and i noticed that the truck does raise the rpms in order to warm up but the rpms surge up and down. not sure if that has anything to do with it or not. thanks for any input guys
FTE-Spread The Knowledge
Joined: Feb 2008
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I have read that the arm needs adjusting in some circumstances, and others that it needs to be cleaned or repaired.
Probably not much help, but someone with vast knowledge will pop in shortly. I am in North Florida and my arm needed adjusting when that happened to us. Now we are back to the jet motor on these cooler mornings.
Probably not much help, but someone with vast knowledge will pop in shortly. I am in North Florida and my arm needed adjusting when that happened to us. Now we are back to the jet motor on these cooler mornings.
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Cargo Master
Joined: Sep 2015
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I have read that the arm needs adjusting in some circumstances, and others that it needs to be cleaned or repaired.
Probably not much help, but someone with vast knowledge will pop in shortly. I am in North Florida and my arm needed adjusting when that happened to us. Now we are back to the jet motor on these cooler mornings.
Probably not much help, but someone with vast knowledge will pop in shortly. I am in North Florida and my arm needed adjusting when that happened to us. Now we are back to the jet motor on these cooler mornings.
Post Fiend
Joined: Mar 2015
Posts: 5,277
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From: Blairsville, Pennsylvania
I've attached the installation and adjustment procedure. 
Tuned
Joined: Oct 2006
Posts: 286
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From: Northern Virginia
Just for clarity, the jet sound is more noticeable listening to the exhaust pipe at the rear. It may not be as noticeable if you have your head under the hood of a cold 7.3 watching the actuator.
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Cargo Master
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i did check at the exhaust while the koer test was going and notta. maybe a very faint jet engine sound but nothing like what others have claimed.
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Cargo Master
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Post Fiend
Joined: Mar 2015
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From: Blairsville, Pennsylvania
Let me say this about the EBPV butterfly system.
I rebuilt my EBPV piston on the bench. I didn't read the adjustment procedures ahead and time and was unprepared and impatient so I "guessed" by making it the same length as the original.
*Maybe* that is okay? Maybe not?
But now that EBPV flapper is on my list of suspects, I am kicking myself because I do not KNOW it is correct and thus cannot rule it out.
Be wiser than I. Read ahead to have the spring and such handy and take your time to do it right.
Those are my words of wisdom today
I rebuilt my EBPV piston on the bench. I didn't read the adjustment procedures ahead and time and was unprepared and impatient so I "guessed" by making it the same length as the original.
*Maybe* that is okay? Maybe not?
But now that EBPV flapper is on my list of suspects, I am kicking myself because I do not KNOW it is correct and thus cannot rule it out.
Be wiser than I. Read ahead to have the spring and such handy and take your time to do it right.
Those are my words of wisdom today
Thread Starter
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Cargo Master
Joined: Sep 2015
Posts: 2,860
Likes: 365
Let me say this about the EBPV butterfly system.
I rebuilt my EBPV piston on the bench. I didn't read the adjustment procedures ahead and time and was unprepared and impatient so I "guessed" by making it the same length as the original.
*Maybe* that is okay? Maybe not?
But now that EBPV flapper is on my list of suspects, I am kicking myself because I do not KNOW it is correct and thus cannot rule it out.
Be wiser than I. Read ahead to have the spring and such handy and take your time to do it right.
Those are my words of wisdom today
I rebuilt my EBPV piston on the bench. I didn't read the adjustment procedures ahead and time and was unprepared and impatient so I "guessed" by making it the same length as the original.
*Maybe* that is okay? Maybe not?
But now that EBPV flapper is on my list of suspects, I am kicking myself because I do not KNOW it is correct and thus cannot rule it out.
Be wiser than I. Read ahead to have the spring and such handy and take your time to do it right.
Those are my words of wisdom today
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