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Duramax Third Generation: 2006-2007.5 (LBZ & LLY) Discuss the third generation (2006-2007.5 LBZ & LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion also belongs in this forum due to the similarities of the 2006 LBZ and the 2006 LLY. Engine related discussion ONLY.

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Old 12-21-2015, 02:01 PM   #1 (permalink)
big truck big power
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123K and its Injector time.

MODS please move if in wrong section

Its time for me to start thing about doing injectors in my lly/lbz. 123K miles and the balance rates are all over the place.

Few Questions
Who is the best to order from, and do i stay with stock or aftermarket company.
What am i looking at in a time frame to do all 8 myself.
What else should i do while im in this deep.

TIA.

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Old 12-21-2015, 02:55 PM   #2 (permalink)
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I would try this first and only use Bosh remanufactured injectors if you need to replace..


https://www.dieselplace.com/forum/63-...x-forum-3.html

These guys have a good reputation on several sites, DuramaxForum and DuramaxDiesels..


https://www.dieselplace.com/forum/68-...l-specialties/

https://www.dieselplace.com/forum/68-...s-savings.html
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Old 12-22-2015, 08:14 PM   #3 (permalink)
willydmax
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If it's running fine with no engine/injector codes I don't think I would pay too much attention to the balance rates unless you have several thousand dollars burning a hole in your pocket
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Old 12-22-2015, 08:43 PM   #4 (permalink)
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I've got LBZs and LLYs with over 250k with original injectors. I'd make damned sure you actually need injectors before jumping in.
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Old 12-22-2015, 10:28 PM   #5 (permalink)
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I have to agree with the others, the likelihood that you need injectors is pretty low.

Remember to check the balance rates the proper way.
https://www.dieselplace.com/forum/63-...nce-rates.html
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Old 12-22-2015, 10:46 PM   #6 (permalink)
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I have 527,000 on my original injectors. You may simply need to run some Amsoil injector cleaner, sea foam or some other name brand cleaner for a tank or two of fuel. I do this whenever my balance rates start to go up.
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Old 12-24-2015, 10:19 AM   #7 (permalink)
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If it's not giving any grief don't sweat it.


People get too hung up on balance rates. They mean little to nothing unless there are symptoms and MANY readers do not report them properly
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Old 12-24-2015, 10:34 PM   #8 (permalink)
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I'm thinking its time, it hazes bad at idle I've done the GM injector cleaner what else can I do ?
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Old 12-25-2015, 10:03 AM   #9 (permalink)
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Did the gm injector cleaner have any effect at all? I have cleaned up my injectors on my lb7 several different times by running triple doses of power service diesel Kleene but it took around 1500 miles and some WOT runs towards the end to clean them up. Your problem is probably your injector tips are dribbling fuel. Maybe they will clean up and stop and maybe they won't. Chances are you only have one or two bad injectors that might need to be replaced. We have several vendors here that are good to work with, including Brent at LDS.
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Old 12-30-2015, 03:45 PM   #10 (permalink)
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Quote:
Originally Posted by big truck big power View Post
I'm thinking its time, it hazes bad at idle I've done the GM injector cleaner what else can I do ?
run a full bottle of stanadyne in a tank and see if any improvement, and try to get fuel at a GOOD fuel station, little corner store fuel stations have **** fuel most of the time, i personaly find SHELL and perto canada has the best fuel up here, Irving Fuel is crap in my eyes. anyways try that the GM injector cleaner i find has never worked very good for me as of long term results, but i have had many LLY's hazing and puking black smoke in stock forum and stanadyne almost took that down to normal smoke, we did put injector in most of them, but the old **** box beater we wanna see how far she goes. 700k original everything except t-stats and fluids ofc

and though i would post this even tho chances are this isnt the issue but never hurts to have information

PIP3491C: Highway Speed Excessive Smoke and Fuel Knock - keywords 6.6 additive balance black contamination cylinder injector LBZ LLY lubrication misfire noise pump white - (Aug 1, 2006)
Subject: Highway Speed Excessive Smoke and Fuel Knock

Models: 2004-2006 Chevrolet Express, Kodiak, Silverado
2004-2006 GMC Savana, Sierra, TopKick
Equipped with a 6.6L Duramax Diesel Engine RPO codes LBZ and LLY

--------------------------------------------------------------------------------

This PI was updated to clarify injector copper sealing leaks, and add information about early build injectors. Please discard PIP3491B.


--------------------------------------------------------------------------------

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
A customer may have a concern of excessive smoke and a fuel knock type noise while driving at highway speed. The customer concern discussed in this PI is more likely to occur in the 15,000 to 20,000 mile range, but may occur at a lower mileage. Excessive smoke may be described as white or black. The smoke associated with this concern will not be a small puff of smoke, but a large plume of smoke that does not dissipate quickly.

Recommendation/Instructions:
Complete current SI diagnostics for any symptoms or DTCs set. Get a large fuel sample from the fuel filter and check for contaminants. If there are signs of contaminants the fuel filter WIF (water in fuel) sensor must be removed. Hard particles will accumulate in the fuel filter WIF sensor area, and close visual inspection of this area will be needed. If contaminants are found, complete the SI procedure for Fuel System Cleaning. Evaluate the customer concern after the fuel system has been cleaned. If no contaminants are found, test drive the vehicle and try to duplicate the customer concern. If the customer concern cannot be duplicated, and the vehicle has only been at the dealer for one time, and one repair attempt, fill the fuel tank and add a fuel conditioner. Only alcohol free water demulsifiers should be used in General Motors diesel engines. The GM Diesel Fuel Conditioner®, The Racor Power Shot Plus®, and the Stanadyne® diesel fuel additives are alcohol free and utilize water demulsifiers to cope with water in the fuel (see service bulletin 03-06-04-017B). Other brands may be available in different areas; be sure that they clearly state that they are alcohol free demulsifiers before use.

If the concern of excessive smoke can be duplicated and the fuel knock is occurring, complete the current SI diagnostics for The Fuel Injector Balance Test with Tech 2.

Monitor and record all cylinder balance rates in drive and neutral.

Injectors that are above +/- 4.0 in park/neutral and +/-6.0 in drive will need to be replaced.

The injector must break both the +/-4.0 and +/-6.0 specification to qualify for replacement.



OR



Cancel the cylinders during the concern.

If canceling the cylinder with the Tech 2 stops the smoke or changes the fuel knock noise, that injector will need to be replaced.

If all the above diagnostics are inconclusive, or the concern is hard to duplicate, follow the steps below:

 1. Remove the injector return lines and inspect the injector return line outlets for signs of rust or corrosion.
 2. If rust or corrosion is found in the injector return line outlets remove the fuel pressure regulator from the fuel injection pump.
 3. Inspect the fuel pressure regulator for corrosion.
 4. If corrosion is found at the injector return outlets and at the pressure regulator, remove the fuel filter from the fuel filter housing and look inside the filter for sediment, rust, or signs of contaminates. Fuel filter inspection includes removing the WIF (water in fuel) sensor and inspecting the filter through the WIF sensor hole.
 5. If rust is found in the injector outlets, the pressure regulator, and the fuel filter, all 8 fuel injectors will need to be replaced. Also replace the fuel filter and pressure regulator during the repair. The injectors will be requested and returned to the WPC and inspected for corrosion. This 8 injector repair is to gather information on fuel system corrosion. If this type of fuel system corrosion is found, the fuel tank must be removed and inspected for contaminants. If contaminants were found in the fuel tank keep a sample of what was found.
 6. If no rust is found in any of the fuel system components and the vehicle is built before 8/20/04, refer to PI # PIP3400A for fuel injector copper sealing washer leaks. A copper seal that leaks (outside of combustion chamber) may be the sign of improper retaining bolt torque, or improper cylinder firing pressures. When a injector copper seal leak is found, there will be combustion soot found outside the combustion chamber (above the copper seal). If the copper seal leak is found the injector should be replaced. Soot found below the copper seal (inside combustion chamber) is not abnormal, and the injector should not be replaced. Be sure to clean injector bores following SI procedures.
Note: If a black smoke/fuel knock has been duplicated on a 2006 model year LLY or LBZ diesel engine, and there is no fuel system contamination/corrosion, check the vehicle build date. If vehicle has less that 4000 miles and was built prior to November 12, 2005 replace all 8 injectors. Complete any injector restriction processes.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

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Last edited by mebob; 12-30-2015 at 03:49 PM.
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