Any help would be great!!!!!!

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siclilly

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ok, i was driving home the other day parked the truck and everything was fine . the next day truck felt like it didn't have the power on the top end. logged the truck and the truck will only hit 74-77mm3 every thing is fine till you hit 77mm3 then the truck falls to 74mm3 and thats all i get!!!:confused:rail pressure hits 23-24k not hitting commanded rail pressure and not flowing commanded flow rate :confused:

changed the lift pump and same thing happens -bottle tested the rail no prob there. I dont think its the cp3 its got about 30k miles on it but i could be wrong:( its on a newer fuel filter (mabey 1k miles on the filter). about to change FPR but before I spend the money thought i would ask mabey someone has had the same problem? truck has 83000k miles on it.

any help would be great !!!!
thanks
kreig
 
bullfrogjohnson

bullfrogjohnson

Big Girl!
Nov 20, 2006
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What the RP doing at WOT and whats it dropping to? Sounds like it could be in the pump. Lso what tuning are you running and what fuel shot?
 
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siclilly

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23-24k for rail pressure at wot should be 26k

change the pump. still does the same thing.:confused:

my tuning.
 
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siclilly

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no I have not changed the cp3 its still pretty new no noises just low rail pressure and flow rate is way down at wot
 
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siclilly

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no im pretty sure I will get a 1093 but i have it tuned not to until 195 mpa so other then that no codes
 
McRat

McRat

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Aug 2, 2006
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Don't rely on mm3 for diagnostics except on a stock tune.
If pulsewidth drops, then you are 100% sure you are defueling. mm3 won't always tell since some PIDs won't report correct mm3's.

On LLY's there is a hidden underboost code, do a search on underboost. It doesn't always trigger a CEL at first, but will later on. It caps fuel delivery when triggered, not RPM like a 1093 will. I don't remember at this moment how I fixed it. That was from 4 years ago?
 
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siclilly

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pulse is down but its reading form 70mm3 line so i guess that wouldnt be down would it?its still following just kinda capped

I checked {c0806} is that what you were talking about ? I changed that when i put on my 4088

caps fuel delivery !!!!!! thats the best way to describe it !! she rips and then kinda slows her roll.
 
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siclilly

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Apr 7, 2008
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McRat said:
Don't rely on mm3 for diagnostics except on a stock tune.
If pulsewidth drops, then you are 100% sure you are defueling. mm3 won't always tell since some PIDs won't report correct mm3's.

On LLY's there is a hidden underboost code, do a search on underboost. It doesn't always trigger a CEL at first, but will later on. It caps fuel delivery when triggered, not RPM like a 1093 will. I don't remember at this moment how I fixed it. That was from 4 years ago?
Click to expand...

oooooooooooooooo 299 found it :D:D:D:D
going to try it......................... that funny !!! just did a way bigger mouth piece to feed the inducer have had it about 2 weeks !!
 
LarryJewell

LarryJewell

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Jan 21, 2007
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siclilly said:
oooooooooooooooo 299 found it :D:D:D:D
going to try it......................... that funny !!! just did a way bigger mouth piece to feed the inducer have had it about 2 weeks !!
Click to expand...
did you try rescaling your maf flow rate (B0201) to compensate for the larger mouthpiece.
 
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siclilly

New member
Apr 7, 2008
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McRat said:
Don't rely on mm3 for diagnostics except on a stock tune.
If pulsewidth drops, then you are 100% sure you are defueling. mm3 won't always tell since some PIDs won't report correct mm3's.

On LLY's there is a hidden underboost code, do a search on underboost. It doesn't always trigger a CEL at first, but will later on. It caps fuel delivery when triggered, not RPM like a 1093 will. I don't remember at this moment how I fixed it. That was from 4 years ago?
Click to expand...

it didnt work:banging::banging::banging:I fix everything so it should have fix it if thats what was up :confused::confused: what do you think pat??

logged it again but rail pressure is 22k and should be 26k but pulse is jumping up and down now :confused:it almost feels like a rev limiter at 2600 rpm wondering if the FPR(FCA) is going bye bye???
 
LarryJewell

LarryJewell

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Jan 21, 2007
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taking a look at your signature I see your using the egr false code shuteruper, that could be a conflict with EFI, might try pulling that and using EFI for the codes.
 
S

siclilly

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Apr 7, 2008
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LarryJewell said:
did you try rescaling your maf flow rate (B0201) to compensate for the larger mouthpiece.
Click to expand...

no i have not the the map is still in the stock location and in the same ID of pipe stock was i didnt think you had to rescale it unless you went to a bigger ID in the same location as the sensor ?????
 
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siclilly

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really!!!! i mean dont get me wrong im going to pull it out -just trying to understand why that little plate would cause that much of a prod !
 
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