Duramax Diesels Forum Truck of the Week
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Old 10-09-2017, 04:25 PM
Tater1 Tater1 is offline
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Default RIP lml cp4

Driving down road today and truck dies instantly. Luckily I was close to home. Hooked scanner up and no rail pressure. So I guess cp4 has died. 130k miles. Just deleted emissions a month ago with a h&s tuner. Anyway considering doing the injectors, pump, rails, lines, lift pump myself. I have the capabilities and resources to tackle it.... I think. Any advice? Horror stories?
Thanks
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Old 10-09-2017, 04:27 PM
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Check your factory fuel filter and make sure you do not have a leak first. I had one of my 2013's die leaving the driveway. V2 showed no rail. Hit the primer button and found the filter leaking around the oring.

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Old 10-09-2017, 04:33 PM
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Hey thanks. Forgot to mention it's a 2012. And I replaced the whole filter base /pump assembly. No luck.
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Old 10-09-2017, 04:41 PM
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You can clean the rails and high pressure lines, fuel supply and return line to the tank.
Drop tank, flush it out for any debris in it.
Youíll have to buy and replace the injector return assembly as well.
Check for debris on the regulator before going and tearing it all apart, unless you are going to do a swap anyways.

Job isnít all that hard, itís harder deciding what size pump and sticks you want to run


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Old 10-09-2017, 04:48 PM
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So if I pull regulator and it's clean? Then what? Gonna pull it in the morning.
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Old 10-09-2017, 04:54 PM
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Check the wire harness for frays and or rub throughs. Prone at the ecm where the harness is next to the frame, over and behind the ac and alt areas as well.



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Old 10-09-2017, 05:15 PM
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Which regulator should I pull? I understand there's one on top of the pump and one on the fuel rail? I really appreciate the help
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Old 10-09-2017, 05:25 PM
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If you have the egr out reach in and pull the pump.
The one on the rail after you confirm metal debris on the pump, that would give you an idea how far the metal traveled.
I donít want to be the bearer of worse news, but if your going to swap the IP for a cp3 youíll have to invest in efi or EzLynk as a tuning platform.


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Old 10-09-2017, 05:50 PM
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Buy the LML cp4 fail kit. Comes with 8 injectors,cp4 and both rails. I personally would replace all high pressure lines and return lines. At 28000 psi metal can get stuck to the lines. Would not risk it over what it cost.
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Old 10-09-2017, 06:34 PM
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I wouldn't put another cp4 in it especially since you'll have the whole thing apart. Peace of mind knowing you won't be doing it again is worth the cp3 conversion.
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Old 10-11-2017, 11:11 AM
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Took it to a local shop. He says there is no rail pressure cranking. Unplugs the regulator and it goes to 31k psi. How does it make that much pressure if the pumps bad?
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Old 10-11-2017, 12:10 PM
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Did they unplug the regulator, or the sensor?

If the rail went up to 31k, it would start. I'm guessing they unplugged the sensor.
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Old 10-11-2017, 01:03 PM
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what are the codes. ill bet there are a few
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Old 10-11-2017, 02:55 PM
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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?
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Old 10-11-2017, 02:57 PM
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Quote:
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?
how big is the tune?
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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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