Duramax Diesels Forum Truck of the Week
  #91  
Old 09-01-2014, 11:06 AM
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DIESELMAFIAPER.LB7 DIESELMAFIAPER.LB7 is offline
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Quote:
Originally Posted by NC-smokinlmm View Post
Why not just swap in a ford cp4.2... lol. Don't the fords have a factory lift pump?
Cp3s are proven and if they grenaded they don't seem to ruin the rest the fuel system like cp4.2 does and yes I believe ford does have a factory lift pump and maybe it would be a worth while swap if they do flow more fuel and don't grenade as often I haven't paid much attention to that in the ford camp lol
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2012 mega cab 6.7: Tuned and deleted (reliable) sold! (should have kept it)

2016 CCSB custom sport lml ltz deleted with sotf tunes by me
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  #92  
Old 09-01-2014, 06:57 PM
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Quote:
Originally Posted by GMfuelsystems View Post
CP4.2 has been changed slightly, like coatings added to the cam and roller Assembly for less friction, the lift pump gear has been slightly changed. Ford 6.7 uses the same Injection pump but their cp4 pump has been stroked for fuel delivery, also Cummins 5.0 liter, AUDI V10 uses the CP4 pump as well. I don't recommend changing the CP4 pump with a cp3 pump for performance purpose's.
You will loose 2000bar capabilities, and if you are that worried about your pump failing remove the meteting valve or the filter between the supply and return ports located on the pump every so often to check debris.

My question is why did GM skimp on the cp4 and ford did not? Piezo cant be all that reliable, I have heard of the piezo going away again.

You are saying the metering valve is the culprit for the failures? Did you all see any issues during testing? There must be a reason ford saw the need to stroke the pump, they are feeding 0.1 more litres than us and there "claimed numbers" are higher.

Is cummins and audi running our pumps or fords stroker pump?

I am merely curious, my signature shows our loyalty to your camp, and that is just a fraction of our rigs. I would like to feel GM has a good reason for doing the things they do other than it saves a few pennies...
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"SARGE" 1966 Jeep/Kieser M35a2 duece, whistler multi fuel engine 6x6 pure beast mode
"Maxine" 2007 Silverado CCSB LT3, LBZ/alli, CTS, PYO's and 265 Hankooks, EFI, MBRP, PPE stuff, bilstien 5100,
"Rusty Bullet" 2007 Classic CCSB, 1 LT, Greystone 4X4, Cognito, EFI, tuned by McRat/Neens, DSP by Mike Meyer, PPE stuff, Autometer, Trippin, Airdog, MBRP, Bilstein, Hankook, TransGo Jr SOLD 437 hp 1051tq STOCK TRANS
"Tow Pig" 2003 LB7/Alli EC/LB 2x4 4" straight, cts, EFI, SOLD
"Squirel" 2000 Chevy Silvy 1500 RC/SB 5 speed 4.8 little screamer back to stock, had polished 243's ls6 intake cam and valve train
"Great White Hope" 2013 silverado 1500 z71 CCSB loaded Corsa Exhaust, gmpp intake, leveled, 5.3 HO
"White Power"-2012 GMC Sierra, White on tan leather, CCLB Dually, 4x4 LML Alli, All stock
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  #93  
Old 09-02-2014, 07:30 AM
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carpenca carpenca is offline
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Quote:
Originally Posted by Dirtbag View Post
No GM only offers a CP4 for the LML. Fleece Performance has developed a kit to allow you to replace the CP4 with a CP3. There are some fitment issues that require you to remove the EGR components and you also will need tuning to control it.

http://fleeceperformance.com/fuel-sy...onversion.html

So far it runs great and definetly has more power.
Permanent removal of the EGR system is not necessary, and tuning may or may not be necessary depending on application. Over zealous CP3 selection leads to more tuning requirements.

Caleb
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  #94  
Old 09-02-2014, 05:22 PM
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Quote:
Originally Posted by carpenca View Post
Permanent removal of the EGR system is not necessary, and tuning may or may not be necessary depending on application. Over zealous CP3 selection leads to more tuning requirements.

Caleb
I spoke to yall today about new tuning and the swap. I'm still debating it...
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2016 LML CCSB Denali < Lifted 22's/35's, Fox 2.0 < I officially need help.
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  #95  
Old 03-09-2019, 09:13 PM
Warrenv Warrenv is offline
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I have a 15+ and I had nothing but problems with it. Just out of warranty had to get head gaskets changed, then rear end started howling and in the process of ordering parts to repair had a piston either crack or a hole but will be doing a compression test in the morning to see which cylinder. I regret buying the truck. Bought it new and worked it from day one cause I lease it to the company I work for. I deleted egr and def with efi live tunes when def started acting up. Love the truck but too many issues. This is my 3rd Dmax. I started off with an 01 lb7 then an 07 lbz and now the 15+ lml and worked all of them the same with this company and issues with my lml only.
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  #96  
Old 08-30-2019, 06:18 AM
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I owned an 11 LML that I bought new, never had an issue. That was with good tuning and sensible operation.

I can say that my buddies shop sees quite a few LMLs in for head gaskets, blown motors, CP4's and various other issues. Don't think I'd ever own one again.
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2007 GMC 2500 CCSB

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2011 Chevy 2500 CCSB

Banks Ram Air, EGR Delete, ProFab Manifolds and Up-Pipes, Fleece CP4 to CP3 Conversion, Built Trans with ML-G converter, FASS Lift Pump, 4" DP Back Flo Pro Exhaust, PPEI EFI Live, EDGE CTS Monitor. -SOLD-
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  #97  
Old 08-30-2019, 07:03 AM
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They are good as long as they are not worked to hard= pulling big loads all the time with a tune, piston crackers.
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04 LB7 ECSB Built motor, Wagler billet narrowed Rods, Callies billet narrowed journal crank, Mahle Race Cast pistons, Randy's Girdle, Wagler/Callies Stage 1 alterfire cam, Exergy 100% SAC's, dual CP3's, Randy's race ported heads, Profab cast flow/up pipes, and Billet S480 over a DTS 67.7
2010 LMM CCLB-Tuning/Exhaust
2015 LML Cab and chassis- Tuning/Exhaust
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  #98  
Old 08-30-2019, 09:57 AM
04chase 04chase is offline
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have a buddy with 400k on his 2011 lml

glowplugs
2 TCM's
deleted since 90k , pulls 4 car hauler 90% of the miles and all stock engine and trans still strong as ever.
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-2007 LBZ CCSB LT3- 3794 stg 2 ,efi dsp5, custom coil over ,deaver 1/2 ton 4" springs , Mike L Trans , fass 150 , k3la ,bolt ons 600whp/1100wtq
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-2012 Ram 5500 6.7 -Kelderman 4 link rear/front , accuair elevel ,service truck #CHASETRUCKMOBILE

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  #99  
Old 08-30-2019, 02:05 PM
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LML is probably the best of the emissions motors. They built more than any other engine code so of course there will be more reported problems. Funny the consensus is lbz is best but they didn't build very many of them so it's not a fair comparison...
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2010 GMC 1500 RCSB Denali Clone < lifted 22's/33's/ Kooks / Magnaflow / 5.3 / 6l80E / TVS1900 @ 14#'s / BTR Top End / Boosted Bump Stick / Trunion upgrade / 90mm / 10% over / 2.8 griptec / 105 lb ID's / Mayhem built/tuned.

2016 LML CCSB Denali < Lifted 22's/35's, Fox 2.0 < I officially need help.
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  #100  
Old 08-30-2019, 02:29 PM
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Friend has 785k on his. Cp4 failure at 400k, crank let loose at 765k
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2003 2500 hd cc/sb (leftovers) MPS 63.5 ihi, built trans, airdog 150, 30 overs..... Sold


New and improved! 2007 classis lbz LS ec/sb

Egr delete, pcv re-route, PIPED, airdog 4g 165,

Danville performance tunes.
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  #101  
Old 08-30-2019, 02:50 PM
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Quote:
Originally Posted by Yngdmax92 View Post
Friend has 785k on his. Cp4 failure at 400k, crank let loose at 765k
Holy hell what does this guy do for a living? Takes me 4 years to put 125k on on my work truck, both my 2004 & 2010 are only in the 70's and I bought them new
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04 LB7 ECSB Built motor, Wagler billet narrowed Rods, Callies billet narrowed journal crank, Mahle Race Cast pistons, Randy's Girdle, Wagler/Callies Stage 1 alterfire cam, Exergy 100% SAC's, dual CP3's, Randy's race ported heads, Profab cast flow/up pipes, and Billet S480 over a DTS 67.7
2010 LMM CCLB-Tuning/Exhaust
2015 LML Cab and chassis- Tuning/Exhaust
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  #102  
Old 08-31-2019, 05:05 AM
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It's a 2012 Denali, starlite tuned since 116k. Crew cab dually. Strict hotshot truck, and it hauls heavy. Has the 19.5 conversation on it. Looks frican mint too!
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2003 2500 hd cc/sb (leftovers) MPS 63.5 ihi, built trans, airdog 150, 30 overs..... Sold


New and improved! 2007 classis lbz LS ec/sb

Egr delete, pcv re-route, PIPED, airdog 4g 165,

Danville performance tunes.
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  #103  
Old 08-31-2019, 08:14 PM
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rcr1978 rcr1978 is offline
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Must be a flat lander truck, it would be dead here I've seen a 100% stock LML crack them here under a 100k to many big passes and heat in the west.
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04 LB7 ECSB Built motor, Wagler billet narrowed Rods, Callies billet narrowed journal crank, Mahle Race Cast pistons, Randy's Girdle, Wagler/Callies Stage 1 alterfire cam, Exergy 100% SAC's, dual CP3's, Randy's race ported heads, Profab cast flow/up pipes, and Billet S480 over a DTS 67.7
2010 LMM CCLB-Tuning/Exhaust
2015 LML Cab and chassis- Tuning/Exhaust
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  #104  
Old 08-31-2019, 09:45 PM
Hoser Hoser is offline
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I’ve only got 112K on mine, but it’s almost always hooked to something or hauling heavy. I drive it like it’s meant to be driven, foot to the floor whether I have my trailers on the back or not. I do brake stands, whip donuts, yank big oak trees out of the woods, haul heaps of firewood through the woods, race anybody that’s willing, etc, and besides a few trips to the shop for warranty work, mainly emissions related, it’s been a solid truck. I guess I do currently have a crack in my radiator but I’m not in any big rush to fix it, even towing my gooseneck through the mountains it never gets warm. It’s been a pretty solid platform for me, a few more issues than my previous gen Duramax trucks, but again, mainly because of emissions.
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  #105  
Old 09-01-2019, 07:34 AM
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S Phinney S Phinney is offline
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They are fairly solid trucks. Maintenance is the most important part of issues with any vehicle. I would buy a 15-16 model if I were looking.


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03 GMC 4x4 CC/SB Intake, Dual Exhaust, built motor by Me, Cognito Kryptonite Suspension upgrades, Custom Traction Bars by Me, Suncoast Trans, 1055-1 Convertor, Two AirDog II 200's, Billet Sump, Venom Tuning AKA Me, Custom Fabbed Fuel system, Flexlite Fans, Best Time to date 7.14 at 98.21 mph 1211.8HP 1954.5 FT/Lb torque
2013 LML Daily Driver, 5" FloPro Exhaust, Venom Tuning, Ad 165 4G Lift Pump, Upcoming HSP Billet Bridge And Piping, Upcoming CP3 Conversion
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