Phone: 503-982-5516 or 503-481-2737

We specialize in light duty diesel as well as Land Rover/Jaguar and all other brands - Financing Available

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Fleet Service Northwest - Home of Superior Duramax Diesel Service and Value

 Want us to fix your GM truck? we have the technical training to properly diagnose your Duramax diesel, call today for an appointment, 503-982-5516

 

We have moved! Our new location is now open:

17527 Highway 99E

Hubbard, OR 97032

 

New- We offer financing! Call for details.

 

We provide specific services that differ from other repair centers and dealerships - BY DESIGN!

Fleet Service Northwest does not offer a discount oil change for your Duramax-powered truck. We use only high quality oil, fuel and air filters and high-quality synthetic/synthetic blend motor oils. These products have proven themselves in the tough fleet environment where our Master Technicians have over 25 years experience, and we're confident that they will keep your Duramax pulling for many years to come.

 

Our Mission - To make your Duramax/Allison combination last for many years to come!

 


 Monthly Service Specials!

 

6.6L Chevrolet/GMC Duramax lube, oil and filter, includes inspection: $99.95. up to 10 qts. fleet plus 15w40 motor oil.

Full synthetic or synthetic blends available

 

All preventive maintenance services are performed by ASE Certified Master Technicians who know your Duramax-powered truck inside and out. A Master Technician is someone who has proven their knowledge and understanding of all vehicle systems, and is qualified to recognize, diagnose, and repair any problems your Duramax may have. These technicians will drain and fill your oil and replace your filter, for sure. But this is only one of a multitude of services and inspections required to maintain your vehicle. Services and inspections performed ONLY by MASTER TECHNICIANS at Fleet Service Northwest!

 

In addition, at Fleet Service Northwest, we have specific preventive maintenance and repair steps designed to PROLONG THE LIFE AND REDUCE THE LONG-TERM COST OF MAINTAINING YOUR TRUCK.

 

Add to this the legendary Allison Transmission behind your Duramax, built on the expertise that has come with decades of heavy-duty commercial and military tactical vehicle transmissions, and its easy to see that the potential longevity of your Duramax/Allison combo is one of the highest quality powertrains in ther light/heavy duty truck market.

 

 

Duramax Tech- articles

 

Injector replacement

 

Diagnosing an injector failure on a Duramax is fairly straight forward but requires some special tools and service information. we have had our fair share of LB7/Early LLY trucks in the shop which were smoking but the balance or return rate data was within spec, so they were denied coverage under the special GM policy which covers them for 7 years/200k miles. I'm not sure what the options are at that point other than to just replace them out of pocket. which  is very expensive.

 

There are however some things you can do to help minimize injector issues.

 

*change your fuel filter regularly*

*use a fuel conditioner/lubricity enhancer*

*do not use dirty fuel, or fuel from low volume stations*

* do not use an aftermarket tuning device*(unless you have considered the entire fuel system into the equasion and made modifications that will avoid fuel starvation issues)

 

To understand injector failures, you must first understand how the fuel system on a duramax diesel works.

 

Fuel is drawn out of the tank via a tandem high pressure pump which is driven off of the camshaft gear on the front of the engine. it then enters the high pressure portion of the pump where it is regulated and pressurized depending on desired power output, excess fuel is returned to the fuel tank at the injector. there is a fuel pressure sensor on the high pressure side of the system, mounted in the fuel rail assembley. this sensor sends an electrical signal back to the ECM based on pressure. there is also a pressure relief in the high pressure fuel system. this valve is a mechanical device which when maximum fuel rail pressures are exceeded, will open and release this pressure  returning it back to the fuel tank passing first through a fluid to air cooler.

 

What Goes Wrong?

 

A stock LB7 will at some point, or has at some point, need a set of injectors. these early injectors are a very poor design, and have suffered a high failure rate. they were supposedly re-designed, but we still see about the same amount of failure. One of the reasons for failure is that these injectors require a higher operating voltage than the later injection systems. the electrical section runs hotter and is more likely to have failure.

 

There was plenty of excitement when GM stepped up and extended the injector warranty under  a special policy to replace failed injectors. this policy covers injectors for seven years, 200,000 miles. the rules have recently changed. the problem with this policy is that injector failures must meet certain criteria in order to qualify for covered replacement.

 

A good example of this would be if your Duramax LB7 is smoking, and all other fuel system components check out, yet the injector balance rates are within the specification, you will not get injector coverage. you are now faced with a four to five thousand dollar repair.

 

Proper maintenence can help minimize injector failures as well as alcohol free, lubricity enhancing fuel additives.

 

 

The 04.5 LLY-07 LBZ

 

This platform was a definite home run for DMax Ltd. When stock, they have a limited amount of failures mostly related to fuel rail pressure loss due to fuel supply deficiencies-Fuel filter restrictions, and fuel rail pressure relief failure. I have personally never seen an injector fail on its own, though fuel contamination has killed a few.

 

 This system has many safegaurds built in, if you are limping the engine or transmission, the system is trying to tell you something is either slipping or starving, using a band aid fix to mask these issues will only delay catastrophy. aftermarket tuning devices can actually enhance fuel economy, but can also cause damage to the engine and transmission.

 

Installing a transmission shift kit in an allison transmission which increases internal pressures is a band aid. these transmissions were not designed to withstand the amount of torque for very long, that can be tuned into a late LLY/LBZ/LMM. the old school rule of build it stronger most certainly applies.

 

 

The LMM

 

Once again another home run hit? well, almost. with the addition of a DPF, comes more issues. one issue is of course the introdution of an injection event during the exhaust stroke to light off the DPF during a regeneration cycle. this can cause fuel to make its way to the engines crankcase, and delute the oil making shorter oil change intervals a very good idea.

 

As this plaform ages, we will see more emerging issues directly related to the DPF.

 

 

And as always, you can be sure we will stay ahead of these issues with training and tooling to support our customers who own a Duramax.

 

 

If you have any questions concerning your duramax/allison, gove us a call today

 

Fleet Service Northwest 503-982-5516

 

 

 

 

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