ok guys this may be a real dumb question to some of you but i was just wondering how are the injectore on duramax trucks fired are they fired using a high pressure oil pump like the fords or is it something different my truck is pretty high mileage and im trying to make the injectors last as long as possible ive been running amsoil fuel additive for quite some time now but i didnt know if there was an injector oil i could change like the fords have

 

I feel the best protection you can get is purchasing quality fuel, from a well known fuel stop, use the best filters available and constantly drain the water out of the filter housing.
The reality is you WILL need injectors but hopefully the above will make them last as long as possible. Sounds like an engine knock , a misfire, blue or white smoke, heavier than normal black smoke extended start times or no start are all signs of failed or failing injectors. Do NOT continue to drive with failed injectors. First problem that could occur is a damaged nozzle or body causing the crankcase to fill with fuel or a problem with that cylinder/piston. Secondly you could cause further damage to an injector that could have been repaired. In some cases if you turn in a cracked injector or completely failed injector on core you will not get your core refund.
Below is a good write up on the firing of the Bosch CR System provided by a shop information service and GM. While not the most complete write up it will give you a basic idea of the operation.

LLY Injectors are controlled by the FICM that meters pressurized fuel to a cylinder. The ECM energizes the low-impedance injector solenoid to open a normally closed valve. Fuel pressure is released from above the fuel injector pintle, and is returned to the fuel tank through the fuel return lines. The difference in fuel pressure above and below the pintle causes the pintle to open.

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Just another note that within the past 2 years I've found more important than ever.

Bulletin No.: 03-06-04-017D

Date: February 20, 2007

INFORMATION
Subject:
Information on Diesel Fuel Additives

Models:
2007 and Prior GM Light Duty and Medium Duty Trucks
2007 and Prior Isuzu Commercial Medium Duty Models

with 6.5L, 6.6L, 7.2L or 7.8L Diesel Engine (VINs F, P, S, Y, 1, 2, D, 6, B, 3 - RPOs L65, L49, L56, L57, LB7, LLY, LBZ, LMM, LF8, LG4)

Supercede:

This bulletin is being revised to add RPO LBZ. Please discard Corporate Bulletin Number 03-06-04-017C (Section 06 - Engine/Propulsion System).

The use of diesel fuel additives is not required or recommended for the 6.5L diesel or the 6.6L Duramax(R) Diesel engine under normal conditions. The filtering system is designed to block water and contaminants without the use of additives. However, some customers may desire to use fuel additives to improve the characteristics of available diesel fuels.

Water Emulsifiers and Demulsifiers

If the customer desires to use a fuel additive, care must be taken in its selection. There are two common methods that fuel additives use to cope with water in the fuel.

One method is through demulsification of water in the fuel. This method causes water particles to combine together to form larger particles, which drop out of suspension. This allows the fuel filter/water separator to separate the water from the fuel as it is designed to.

The other method of coping with water in the fuel is through emulsification. This method, often using alcohol as the emulsifier, keeps water particles suspended in the fuel. Emulsification of water in the fuel can allow water to get past the fuel filter/water separator, in most cases causing damage to the fuel system. Only alcohol free water demulsifiers should be used in General Motors diesel engines. GM Diesel Fuel Conditioner(R), P/N 88861009 (in Canada, 88861038) or both *Racor Power Shot Plus® and *Stanadyne(R) diesel fuel additives are alcohol free and utilize water demulsifiers to cope with water in the fuel. Other brands may be available in different areas; be sure that they clearly state that they are alcohol free demulsifiers before use.

*We believe these sources and their products to be reliable. General Motors does not endorse, indicate any preference for or assume any responsibility for the products from these firms or for any such items which may be available from other sources.

Common Diesel Fuel Concerns

Fuel Waxing/Icing

Fuel distributors blend # 1 and # 2 diesel fuels for seasonal requirements in a particular region. No other blending of fuels is recommended. However, a customer may desire to use a winter fuel additive to prevent fuel waxing or icing during extreme cold snaps. If a winter fuel additive is to be used, it should not contain alcohol or other water emulsifiers that may compromise the water removal effectiveness of the fuel filtering system.

Bacteria and Fungi Growth

Bacteria and fungi growth can occur in diesel fuel when there is water present, especially during warmer weather. The best prevention against bacteria and fungi growth is to use clean fuel that is free of water. There are diesel fuel biocides available that are designed to kill bacterial growth in the fuel system. However, the dead bacteria can still cause blockages throughout the fuel system. If bacterial growth is found in the fuel system, the proper method of removal is to flush the fuel system using Service Manual procedures, replace the fuel filter element and refill the tank with clean diesel fuel. If a customer desires to use a biocide after flushing the fuel system, it should not contain alcohol or other water emulsifiers.

Low Cetane Number

The cetane number is one indicator of a diesel fuel's ability to ignite. There are many indicators of overall fuel quality such as cleanliness, specific gravity, volatility, viscosity, detergency, corrosion inhibiting abilities, and lubricity. Increasing the cetane number alone is not a fix for poor quality fuel. Additionally, increasing the cetane number beyond the engine's requirements will not increase performance. However, the cetane number of diesel fuel is not always consistent and some customers may desire to use a cetane improver to ensure full performance of their engine. If such an additive is to be used, it must not contain alcohol or other water emulsifiers.

Poor Lubricity

The 6.5L diesel and the 6.6L Duramax(R) Diesel engines are designed to operate on today's low sulfur fuel without the use of additives. A fuel additive designed to increase lubricity is not a fix for poor quality or contaminated fuel, but some customers may desire to use a lubricity additive to aid in the longevity of their fuel system components. If such an additive is to be used, it must not contain alcohol or other water emulsifiers.

Fuel Source Issue

If a vehicle is properly maintained but has fuel contamination issues, consider obtaining fuel from a different source. Purchasing fuel from a high volume fuel retailer increases the chance that the fuel is fresh and of good quality.

 

When your dealing with high mileage trucks don't ever chip them. They make the injectors go, blow the head gasket in some and do hell to the Allison. But if you really wanted to I've never used it myself nor heard any reviews from
It but there is a fuel additive that helps clean out injectors. I would do my research before using it but it's a possibility.

 

Increasing rail pressure might but chipping a truck really has minimal impact if you drive like you have sense. There are thousands of products that "clean" injectors but the injectors don't fail from carbon build up like gas vehicles used to. With pressures from 5k-35k there's no possibility of varnish or buildup. They fail due to a worn ball and seat or a failed pintle or a crack in the body. Fuel treatment may help prolong the wear but it still occurs.

Sent from my DROID BIONIC using Tapatalk

 

Fords don't have injector oil. It uses the same oil the engine does.

 

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