Duramax Diesels Forum Truck of the Week
  #16  
Old 10-12-2017, 06:29 AM
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Originally Posted by Chevy1925 View Post
how big is the tune?
Just an economy tune.
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  #17  
Old 10-12-2017, 06:41 AM
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If you end up needing the pump/injectors and rails we have a full kit here at a killer price! Let me know if i can help.
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  #18  
Old 10-12-2017, 06:44 AM
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Originally Posted by wilsondiesel View Post
I have one that's tripped a p0087 and when logging rail psi at wot, desired is 29k but actual around 24-25k, this truck only has 78k miles, it is deleted and running an Air Dog, time for a cp3 conversion?


Have you checked the regulator on the fuel rail for debris ? Any type of debris will fail the regulator and cause it to stay open longer than required tripping the code for low fuel pressure.

Then there’s the basics with the rubber on the fuel supply lines, and the fuel basket in the tank collecting garbage in the screen.

If you find debris on the regulator, you can assume the worse with the cp4.


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  #19  
Old 10-12-2017, 07:10 AM
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Quote:
Originally Posted by wilsondiesel View Post
Just an economy tune.
has it done it since the tune? there are a couple things that must be done right in the tune to keep rail pressure up.
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02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

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  #20  
Old 10-12-2017, 08:48 AM
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Quote:
Originally Posted by Chevy1925 View Post
has it done it since the tune? there are a couple things that must be done right in the tune to keep rail pressure up.
Believe truck felt a little sluggish before delete, but its only coded once for low rail in the last 7 months since its been deleted.
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  #21  
Old 10-12-2017, 08:50 AM
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i would put a stock delete tune in, test and if that still shows low rail, start looking at the FPR like stated
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James

02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
Tailgate Crew Member #4
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  #22  
Old 10-12-2017, 08:53 AM
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Quote:
Originally Posted by Chevy1925 View Post
i would put a stock delete tune in, test and if that still shows low rail, start looking at the FPR like stated
When cp4's just get weak they'll still put shrapnel in the system or is that just catastrophic failures?
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  #23  
Old 10-12-2017, 08:59 AM
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Quote:
Originally Posted by wilsondiesel View Post
When cp4's just get weak they'll still put shrapnel in the system or is that just catastrophic failures?
when they start going, they start going fast and it will start putting steel in the fpr. from there it starts throwing steel down to the injectors quickly after. they generally dont wear out like a CP3 till you get lots and lots of miles on them. if its ran that slow for a long time, it may not be a CP4 but until you start diaging it, we dont know.
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James

02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
Tailgate Crew Member #4
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  #24  
Old 10-12-2017, 02:35 PM
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Just got three in here that are all failed. A 69k '14 3500 w/t. Chevy garage replaced pump, lines, rails, and injectors under warranty. Also a '12 2500 ltz with 205k. It runs and sounds great but will only make 90mpa. Has one injector balance rate bad. Will be tearing into it next. Also bought one with 119k that someone pulled the regulator and left in the cab. It's covered in debris and no start. Fun fun
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  #25  
Old 10-12-2017, 04:43 PM
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Originally Posted by 04jimc View Post
Just got three in here that are all failed. A 69k '14 3500 w/t. Chevy garage replaced pump, lines, rails, and injectors under warranty. Also a '12 2500 ltz with 205k. It runs and sounds great but will only make 90mpa. Has one injector balance rate bad. Will be tearing into it next. Also bought one with 119k that someone pulled the regulator and left in the cab. It's covered in debris and no start. Fun fun
Wanna sell that last one ?
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Special thanks to Evan, James, Russell, Mark and all the others I'm forgetting.
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  #26  
Old 10-12-2017, 04:53 PM
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Wanna sell that last one ?
Before it's fixed? Definitely

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03 Chev CC SB ZF6-Gone
04 GMC CC SB SLT LLY
597/1096 Batmostocker-Gone

06 GMC CC DRW-Gone
08 GMC CC DRW-Gone
Current Tow Rig-12 Ram 4500 Crew


'Oughta K
now Better'- PPL Lim Pro Stock 05 3500 Crew Cab 158" WB 2014 PPP 2.6 Champions
Thanks to Blackout Performance

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  #27  
Old 10-13-2017, 04:53 AM
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Before it's fixed? Definitely

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Pm me some specifics
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01 ext cab, 480 over billet ihi, trans with g converter, sac 45s, tap shift, lots of black, everything built by myself with help from some of the best in the buisness.

Thanks to everyone on this forum who has helped me and those whom I bought parts from.

Special thanks to Evan, James, Russell, Mark and all the others I'm forgetting.
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