Duramax Diesels Forum Truck of the Week
  #76  
Old 01-06-2017, 05:44 PM
Cheeny23's Avatar
Cheeny23 Cheeny23 is offline
FNG
 
Join Date: Jan 2017
Posts: 3
Default

Quote:
Originally Posted by quadracer37 View Post
I would do a new injector return line assembly with check valve, and replacing the rail pressure sensor and electric relief valve is also a good idea. They might get by OK for a little while, but you dont want to end up stranded somewhere because of one of these items failing not long after the repairs.
he removed the whole fuel system to send out and cleaned at the same place that benched my injectors. If any of it is bad, he already knows to replace it. It's just money right
__________________
2013 GMC Sierra 2500hd Crew Cab Duramax
2002 GMC Sierra Ext Cab 5.3
1956 Chevy 3600 Task Force
Reply With Quote
  #77  
Old 01-11-2017, 06:53 AM
TakeAwayTheFear TakeAwayTheFear is offline
FNG
 
Join Date: Jan 2017
Posts: 1
Default

So I have a 2015.5 and so does my step dad. Both are 3500 duallys I have 226k miles and he has 254k no problems. His buddy has a 13 or 14 2500 with well over 300k with no probs but my brother has a 15.5 2500 with 140 and his just took out the whole motor from what I heard yesterday....... all the trucks are used to transport campers all over the country. Mine and step dads have been tuned for the past 40-70k miles just for fuel economy and emissions. Was told it was a 40-50hp tune
Reply With Quote
  #78  
Old 01-11-2017, 11:52 AM
2004LB7's Avatar
2004LB7 2004LB7 is offline
Hotrodder
 
Join Date: Dec 2010
Location: Norcal
Posts: 683

Default

just so there is no confusion. bosch made no meaningful "updates" to these pumps since their introduction to correct the problem.

the biggest updates was coating changes to the roller follower and new body alloy (high silicone cast aluminum). the issue of the roller getting jammed up and not rolling on the cam will not be solved by this. also the bigger issue that seems to occur is the roller (and follower) turns 90 degrees to the cam and has no way to roll. this grinds a groove in the roller and cam sending metal into the fuel system.



all CP4s suffer from these failure modes, whether it is a CP4.1 or CP4.2. the design of the pump is the problem here. added lubrication MAY help extend the life of the pump but it seems that pumps still fail regardless.

the TDI club has this well documented with the CP4.1 used on the VW TDI
http://forums.tdiclub.com/showthread.php?t=299854
and
http://forums.tdiclub.com/showthread.php?t=286380
and of course my thread
http://forums.tdiclub.com/showthread.php?t=387252

the best guess and evidence as to why Bosch would make this change is to lower the cost of manufacturing. the CP3 has an almost all high strength steel body to handle the pressures, plus three precision ground/machined pistons, valves and related parts. in the CP3 each piston only makes one pressure stroke per a revaluation. the CP4 piston makes two. this is twice the strokes

the CP4 only has a steel piston head that retains the pressure. the body is all aluminum. there is only one piston in the CP4.1 and two pistons in the CP4.2. the parts count on the CP3 is several times higher than a CP4. being that a CP4 retails for roughly the same cost as a CP3 this was likely a way for bosch to increase profits. bean counters likely designed this pump.

what doesn't make sense is now they are paying more on the HPFP warranties along with replacement of contaminated parts as a result. whether they come out ahead is anyone's guess

luckily i am still driving an LMM so i don't have to worry there but i did experience a CP4.1 failure on my VW TDI. right now i am in the process of collecting the parts needed to convert that over to a CP3/R70 pump.

If my duramax had a CP4, converting it to a CP3 would be one of the first upgrades i did after the warranty was up
__________________
2008 Chevrolet 3500HD DRW LTZ
285/75/17 Nitto Dura Grapplers, 4.56 gears, Front and rear ARB lockers, Efi Live tuning by me, Raptor 160 LP, Cognito 4-6 NTB Lift, 4" Exhaust, Built Trans by Mike L.

Last edited by 2004LB7; 01-11-2017 at 12:02 PM.
Reply With Quote
  #79  
Old 01-11-2017, 07:17 PM
TheBac's Avatar
TheBac TheBac is offline
Why do I keep doing this?


 
Join Date: Apr 2008
Location: Mid Michigan
Posts: 10,780

Default

One thing Ive always wondered about the CP3 swap is how does a CP3 maintain the higher PSI that the LML requires (not to mention the fuel volume) when its essentially "half" a CP4?? Just curious.
__________________
Tom
"BBT" 2003 GMC CC/SB 4x4
12.14@111.15

"Flyin' Brick" 1999 Chevy 1500 RC/SB 2wd -- in progress
2014 Chevy Cruze Diesel -- the DD

Two wrongs dont make a right, but three rights do make a left.

Reality is a matter of perspective.

This forum isn't for the weak of heart.....or wallet.

From mufflerguy on yb,
"Lets build a race car they said. Itll be fun they said. I don't know who "they" are.........but they need a good punch in the face!"
Reply With Quote
  #80  
Old 01-11-2017, 11:27 PM
2004LB7's Avatar
2004LB7 2004LB7 is offline
Hotrodder
 
Join Date: Dec 2010
Location: Norcal
Posts: 683

Default

An excerpt from truck trend

"The CP3 is a radial-piston pump that can supply up to 29,000 psi in some applications and is perhaps the most well known and most modified high-pressure pump on the market."

"Next is the CP4, which is also made by Bosch. Although it has a higher number designation, the CP4 actually flows about 20 percent less fuel than its younger brother, the CP3. Found on ’11-to-present Power Stroke and Duramax engines, the CP4 is a more advanced pump despite flowing less fuel, with external high-pressure circuits and a maximum pressure of 29,000 psi."
__________________
2008 Chevrolet 3500HD DRW LTZ
285/75/17 Nitto Dura Grapplers, 4.56 gears, Front and rear ARB lockers, Efi Live tuning by me, Raptor 160 LP, Cognito 4-6 NTB Lift, 4" Exhaust, Built Trans by Mike L.
Reply With Quote
  #81  
Old 01-11-2017, 11:39 PM
Digmax Digmax is offline
Hotrodder
 
Join Date: Jan 2016
Posts: 266
Default

Quote:
Originally Posted by TheBac View Post
One thing Ive always wondered about the CP3 swap is how does a CP3 maintain the higher PSI that the LML requires (not to mention the fuel volume) when its essentially "half" a CP4?? Just curious.
Not sure on this but converted to a 10mm cp3 and that thing will hold 29 no prob on max effort
Reply With Quote
  #82  
Old 01-18-2017, 10:23 AM
Cheeny23's Avatar
Cheeny23 Cheeny23 is offline
FNG
 
Join Date: Jan 2017
Posts: 3
Default

i sent emails to the NHTSA and GM about it, and filed a formal complaint with the NHTSA. granted it's probably not going to be found as a "safety" issue, just trying to ruffle feathers at this point. I was in AZ for the weekend and got a call from someone at GM, and she asked me some questions, apologized for the inconvenience, blah blah, then she said she was going to reach out to my local dealer where I bought the truck and start a reimbursement claim process. not sure if anyone else has gone through it or been successful, but at this point, any money back in my pocket and I'd be happy. final bill was $8979 with the sdp cp3 kit, airdog 4g, and new injectors, the rest of the fuel system was fine, no contamination back to the tank. I'm friends with a few of the guys at the dealer, since we get all our personal and company vehicles there, so i'll follow up with them today and see what's going to happen with that claim.
__________________
2013 GMC Sierra 2500hd Crew Cab Duramax
2002 GMC Sierra Ext Cab 5.3
1956 Chevy 3600 Task Force
Reply With Quote
  #83  
Old 08-24-2017, 11:42 AM
Fjmaess Fjmaess is offline
FNG
 
Join Date: Aug 2017
Posts: 1
Default CP4 Failure

Add me to the list. 2016 Chev 2500, 22,000 miles, completely stock. Towed our boat down to Norris Lake, dropped it at the marina to go pick up RV and put it at marina when boom....DIC flashed "Reduced Engine Power" and "Change Fuel Filter". truck still moves but VERY slowly. Codes were for low fuel rail pressure, and another that my scanner didn't recognize. Had to have it towed into Chevrolet dealer in Knoxville, TN where they told me the entire fuel system has to be replaced. $15,000 and 2 weeks, luckily all covered under warranty.

I have been told that this failure is covered on the 5 year/100K mile powertrain warranty, but have trouble finding that exact language in the warranty. does anyone know anything about that>

Also, I don't believe installing a lift pump (Fass or Airdog), would void any warranty...but again, does anyone have any specific knowledge on that?
Reply With Quote
  #84  
Old 08-24-2017, 12:43 PM
LML6600DMAX LML6600DMAX is online now
Gearhead
 
Join Date: Dec 2015
Posts: 35
Default

Quote:

Also, I don't believe installing a lift pump (Fass or Airdog), would void any warranty...but again, does anyone have any specific knowledge on that?

This will depend on the dealer some wouldnt care and others would deny you.

Cp4 is covered under the 5yr 100k power train



Sent from my iPhone using Tapatalk
Reply With Quote
  #85  
Old 08-24-2017, 04:24 PM
02greysixer's Avatar
02greysixer 02greysixer is online now
Hotrodder
 
Join Date: Jun 2011
Location: North Central FL
Posts: 1,700

Default

In the past month and a half we've seen 6 cp4 pumps grenade. 4 Duramax, 1 Ford and an Audi Q7.

Got me paranoid about my 6.7. Really wish I could do a cp3 swap.

Sent from my SM-G930P using Tapatalk
__________________
2010 LMM CCSB LT
4" Flo-Pro
FASS 150
Beans Sump
Leveled w/ drop shackles
RidgeRunner Tunes
More to come

Rip zf6 swapped lly
Reply With Quote
  #86  
Old 08-24-2017, 04:29 PM
FROGMAN524's Avatar
FROGMAN524 FROGMAN524 is offline
Hotrodder
 
Join Date: Jul 2010
Posts: 127
Default

Have the Duramax trucks had lift pumps or other mods?


Sent from my iPhone using Tapatalk
__________________
2016 Sierra 3500HD Denali CCSB
MotorOps on Spade Tuner/AirDog 165 II-4G/S&B CAI/FloPro 5" SS Turbo Back W/Muffler/30" FTE Resonator/MBRP 6" SS Tip/CTS2 Insight/EDGE EGT Probe/GMC-Kicker Soundgate Sub
SOLD2015.5 GMC Sierra 3500HD Denali CCSB
SOLD2007.5 GMC Sierra 2500HD SLT CCSB Graystone/Ebony
Z71 4x4 DuraAlli EFILive by ATP Air Dog II 165 G2 Diff Cover Alli Deep Pan TranSynd Cognito Boxed UCAs
Kryptonite Tie Rods Cognito PISK Bilstein 5100s Bilstein Stabilizer PPE Race Valve/Ported fitting MBRP 5" DP Back RBP 6x18" Tip AutoMeter Cobalt Boost & Pyro Advent OGM-1 Nav Method 16x8 Machined BFG KO2 286/75R16 Mike L Suncoast/Goerend
SDP Twins PPE Race Up-Pipes/Manifolds

If wishes were horses, beggars would ride.
Reply With Quote
  #87  
Old 08-24-2017, 04:57 PM
02greysixer's Avatar
02greysixer 02greysixer is online now
Hotrodder
 
Join Date: Jun 2011
Location: North Central FL
Posts: 1,700

Default

Quote:
Originally Posted by FROGMAN524 View Post
Have the Duramax trucks had lift pumps or other mods?


Sent from my iPhone using Tapatalk
No lift pumps on them. 1 is a fleet customer of ours. We've cared for the truck since basically new. It died because of contamination. Fuel was slam full of water from a shady gas station. 40 horse h&s. 1 had less than 100k, efi tunes of some kind. 1 had 120k, lived on h&s perf tune. Last one has 150ish, not sure what tune or power level it's at. Didn't ask the customer and don't have it running yet.

Sent from my SM-G930P using Tapatalk
__________________
2010 LMM CCSB LT
4" Flo-Pro
FASS 150
Beans Sump
Leveled w/ drop shackles
RidgeRunner Tunes
More to come

Rip zf6 swapped lly
Reply With Quote
  #88  
Old 08-24-2017, 06:42 PM
FROGMAN524's Avatar
FROGMAN524 FROGMAN524 is offline
Hotrodder
 
Join Date: Jul 2010
Posts: 127
Default

These stories make me want to do a swap but don't want to spend $3000 right now if not needed.


Sent from my iPhone using Tapatalk
__________________
2016 Sierra 3500HD Denali CCSB
MotorOps on Spade Tuner/AirDog 165 II-4G/S&B CAI/FloPro 5" SS Turbo Back W/Muffler/30" FTE Resonator/MBRP 6" SS Tip/CTS2 Insight/EDGE EGT Probe/GMC-Kicker Soundgate Sub
SOLD2015.5 GMC Sierra 3500HD Denali CCSB
SOLD2007.5 GMC Sierra 2500HD SLT CCSB Graystone/Ebony
Z71 4x4 DuraAlli EFILive by ATP Air Dog II 165 G2 Diff Cover Alli Deep Pan TranSynd Cognito Boxed UCAs
Kryptonite Tie Rods Cognito PISK Bilstein 5100s Bilstein Stabilizer PPE Race Valve/Ported fitting MBRP 5" DP Back RBP 6x18" Tip AutoMeter Cobalt Boost & Pyro Advent OGM-1 Nav Method 16x8 Machined BFG KO2 286/75R16 Mike L Suncoast/Goerend
SDP Twins PPE Race Up-Pipes/Manifolds

If wishes were horses, beggars would ride.
Reply With Quote
  #89  
Old 08-25-2017, 02:56 AM
Yngdmax92's Avatar
Yngdmax92 Yngdmax92 is online now
Hotrodder
 
Join Date: Sep 2013
Posts: 380
Default

Am I the only one who saw the new TSB from gm about lml injectors and fuel rails? I want to say it was around $2200 for all 8 Injectors with out cores and new rails and lines. My friend showed me on gm website. I thought that was pretty cool and from what I understand, they know what happening and giving a little break on the parts cause of it. Correct me if I am wrong.
__________________
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.
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -7. The time now is 04:45 PM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
vB.Sponsors