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Duramax 6600 Welcome to the Internet's first Duramax 6600 diesel discussion forum for the LB7, LLY, LBZ, LMM, LML, LGH & L5P RPO code engines. Tips on performance, fuel economy, troubleshooting and more.

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  #41  
Old 07-04-2010, 12:31 PM
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WhiteTruck WhiteTruck is offline
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While rare, there is one potential area that can cause a restriction and yet not be detected by checking at the factory test port. There is a short section of line/hose that is AFTER the test port going to the injection pump. The rubber part could deteriorate internally, causing a restriction. I wouldn’t look at this until the usual causes of low rail pressure have been checked, but something to keep in mind.
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  #42  
Old 07-29-2010, 09:13 PM
Clintv331 Clintv331 is offline
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Default Need Some Help with this!

For the past few weeks my truck (2006 LBZ) has been taking longer than normal time to start and has gotten worse in the past two days. Well two days ago under normal driving conditions (no load or anything) I get DTC P0087. Once the engine light was on i couldn't rev up more than 2k rpm (in park or while driving). i cleared the code with my tuner and not two seconds later it was back. at first i was thinking it was my fuel filter since it was about time to change it. Well i changed the fuel filter today and then went for a test run. I first cleared the code before taking off. once i got to not even half throttle the dtc was back. it feels like it's not getting enough fuel and is being restricted. when i got back i turned the truck off and when i started it back up it didn't take as long as it did before i changed the filter. also there is a little bit of black smoke coming out the exhaust when at idle. I have it on stock tune.

Could this be due to those hoses collapsing, bad injectors, bad fuel, or what? Can someone please give me some insight on this.

Performance mods: K&N Cold air intake, MBRP 4" turbo back exhaust, & Bullydog PMT

Thanks,
Clint
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  #43  
Old 07-30-2010, 06:52 AM
Kennedy Kennedy is online now
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As stated earlier:

There is a simple, sure fire way to test all but the one point of restriction that White Truck mentioned. It also will save you from making premature filter changes and let you know if indeed the filter is loaded:

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  #44  
Old 07-30-2010, 06:53 AM
Kennedy Kennedy is online now
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Also watch your WIF sensors. Been seeing some of them start to leak. When an extended crank is noticed I generally recommend pumping up the primer bulb hard and this will often show a leak.

A lift pump would keep the system full of fuel and not air...
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More than just a salesman-I use and test the products that I sell on a daily basis!
Superflow Lie Detector in house
2002 Chev K2500HD D/A CC Long LT 11.77@ 124mph at 7700# fuel only-e.t. needs help
2005 Chev K3500SRW D/A CC Long LT(SOLD)
2007 Chev K2500 Classic EC Short LT (Sold)
2012 GMC K3500SRW D/A CC Long LTZ Happy Birthday to me! Built 1 working day after my birthday and delivered 7 days later.
2016 GMC K3500SRW D/A CC short LTZ

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  #45  
Old 08-01-2010, 11:14 AM
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The information in GM PIP4526 is only helpful in the sense that it says that GM approves replacing only the hose portion of the line instead of the complete line(s) they recommended in the past. There is no new diagnostic information in it, as the supply line diagnostic is still done with a restriction gauge as JK recommends for possible causes of P0087, P0093 or P1093.
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  #46  
Old 07-12-2012, 06:08 PM
Demilee Demilee is offline
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Default Resolution?

Has anyone found a resolution to this problem? We are having the EXACT SAME problem. We've already replaced the hose recommended in GM PIP4526. We had that done in Austin, TX. We thought it worked until we got into some hills in Arizona and California on our drive out there.

We'd rather not spend the $4k+ on fuel injectors if that isn't the problem. Of course we have 117k miles on our 2008 3500 DRW Silverado so a warranty claim is out of the question. We only found out about the issue right after we bought the truck at 105k miles to tow our 2012 Voltage.

Any help would be appreciated!
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  #47  
Old 07-13-2012, 05:02 AM
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I do not know of any solution to this GM programming error, other than (uneccesary) injector replacement.

Have started seeing the same issue with my 2009, starting at 125K miles. In all other ways the truck runs and performs as new.

For the $4500 injectors cost, I'll keep pushing the 'reset' button on my scan tool and clearing codes until someone programatically fixes this bug in the ECM code. When under these conditions, I keep it plugged in and resting on the passenger seat. Silly, huh? I reset the code at least ten times yesterday.

GM should be more interested, as it causes a liability issue when you reduce power to someone towing heavy on a hot day uphill...NOT good.
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  #48  
Old 07-13-2012, 06:21 AM
greatwhite greatwhite is offline
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Quote:
Originally Posted by Mark Rinker View Post
...
For the $4500 injectors cost, I'll keep pushing the 'reset' button on my scan tool and clearing codes until someone programatically fixes this bug in the ECM code. When under these conditions, I keep it plugged in and resting on the passenger seat. Silly, huh? I reset the code at least ten times yesterday...
You just brought back memories of driving down the road with a glitching PMD and the laptop set up on "clear codes" to stay out of limp mode....

Yeesh.

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  #49  
Old 07-13-2012, 10:10 AM
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Arrow Just some thoughts - and more questions...

These rail pressure code problems come up occasionally during the hotter summer months in trucks with some miles on them - like 75,000 to 150,000 miles, while the injector data (balance rates, etc.) looks just fine when sitting in the dealer's parking lot.

The Bosch high-pressure pump appears to have a more difficult time producing the commanded rail pressure when temps are high and the fuel has thinned due to the high temperatures. Not able to meet the commanded pressure could be due to excessive fuel return flow in the injectors, pumping plungers in the Bosch CP pump not able to produce the pressure or a heat-related problem with the fuel rail pressure sensor.

With higher heat, the close fitting parts within the injectors and pumps can't generate the pressure it needs to. One way to mitigate this problem is to do something to keep fuel temperature down.

Is the return fuel cooler, located ahead of the fuel tank, clean? You can also maintain a higher level of fuel in the tank. More fuel in the tank provides a larger heat soaking reservoir. Worst case scenario - a low fuel tank and a mud caked cooler, then tow heavy in high heat. Is a larger fuel cooler or an auxiliary fuel tank (to keep the main tank full, longer) workable ideas... instead of replacing a set of out-of-warranty injectors?

If this were a 6.5, I'd suggest temporarily raising the fuel viscosity by using motor oil in a 10% mix to help determine whether the problem is due to a worn fuel injection system. Can't do this with a DOC/DPF equipped 2007+ truck. But, what about B5 - B20 bio-diesel, which is approved for the LML?

Jim
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  #50  
Old 07-13-2012, 11:21 AM
CoyleJR CoyleJR is offline
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Default Good thoughts, Jim

Jim has probably hit the nail on the head. My 2006 LBZ has 180k very hard towing miles on it and has never had a problem. I keep the primary fuel tank full at all times through a gravity feed from the 100 gallon aux tank. The full tank will absorb a lot of heat from the returning fuel. Additionally, I always pressure wash the fuel cooler when I wash the truck.
So far so good.
John
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