What causes the injector on a Duramax to leak?
Leaking Injectors—LB7 One thing the ’01-’04 LB7 Duramax is notorious for is injector failure. The two primary failure points of the factory injectors are internal cracking of the injector body itself and corrosion-induced failure of the internal ball seat.
Why do I have black smoke coming from my fuel injector?
Black smoke from the exhaust can also be a sign of a clogged air filter. In a worst-case scenario, damaged fuel injectors can also produce black smoke. One should also never discount the possibility of a faulty fuel pressure regulator. As mentioned above, a problem in this component can lead to an issue in the air-fuel mix.
Why is my Duramax diesel engine not working?
The trucks computer keeps track of how much fuel needs to be added or subtracted from each individual cylinder to make the engine run smoothly, and this value is called the balance rate. If one cylinder is contributing too much or not as much as the rest, the cause is usually a bad injector and the cure is a replacement.
Are there any flaws in the Cummins Duramax?
Still, and just as we exposed the shortcomings of the almighty Cummins, the Duramax isn’t without its flaws—some of them catastrophic. For example, did you know the injection pump on the LML version is prone to coming apart and wrecking the entire high-pressure fuel system when it does?
When to test the fuel system in a Duramax?
On a good fuel system the fuel pump can produce maximum system pressure during cranking. If the engine won’t start and actual fuel rail pressure is low during cranking, the supply side should be checked before testing the high side. Start by first stroking the hand pump.
How can I Keep my Duramax Diesel pump healthy?
However, there are measures you can take to keep the pump happy and healthy, the first being to always buy your diesel from a high-traffic, reputable filling station that’s known to dispense good, clean fuel. Second, always change the fuel filter at or before the recommended service interval.
Where is the CP3 injection pump in a Duramax?
The CP3 injection pump sits in the valley of the engine between the cylinder heads and is driven by the camshaft gear, and it has two main jobs: get fuel from the tank up to the engine, and pressurize the fuel to 26,000psi and ultimately inject it into the engine.
Leaking Injectors—LB7 One thing the ’01-’04 LB7 Duramax is notorious for is injector failure. The two primary failure points of the factory injectors are internal cracking of the injector body itself and corrosion-induced failure of the internal ball seat.
However, there are measures you can take to keep the pump happy and healthy, the first being to always buy your diesel from a high-traffic, reputable filling station that’s known to dispense good, clean fuel. Second, always change the fuel filter at or before the recommended service interval.
Where does the fuel go in a Duramax?
There is no lift pump in the fuel tanks or on the frame. The fuel passes through the base plate of the fuel injector control module (FICM) to cool the module. From the FICM the fuel flows to the fuel filter assembly, which combines a water separator, a prime pump and a filter element.
What’s the normal range for a Duramax injector?
The normal ranges for automatic transmissions is +/- 4 mm3 in park or neutral, and it can go as high as +/- 6 mm3 in gear. Starting on 2006 all Duramax injectors use an injection quantity adjustment number on top. This is established by Bosch during testing.
Are there any problems with the Duramax engine?
The failure is most common in higher horsepower engines, but can still occur in moderately modified and even stock power plants. Not specific to one version of Duramax in particular (ex: LB7, LLY, LBZ, LMM or LML), the problem exists across all generations.
Why is oil shooting out of the oil fill tube?
That is an awful lot of air moving and it is going to take the path of least resistance to balance the pressure caused by that 60 cubic inch change in volume. If you provide a path that is through a hole in the oil pan, it is going to expel oil with it. That is why most vertical shaft engines with a dipstick have a screw down cap.
What causes the oil to blow by in a diesel engine?
Causes of Diesel Engine Oil Blow By. by Tony Oldhand. In a diesel engine, blow by is defined as the compressed fuel/air mixture in the combustion chamber leaking past the piston and entering the crankcase. Blow by is not good since it robs engine power and builds up gas pressure in the crankcase.
Are there any injector removal tools left in stock?
Only 8 left in stock – order soon. . Only 9 left in stock – order soon. . Only 7 left in stock – order soon. . Only 7 left in stock – order soon.
What are the symptoms of a torque converter lockup?
One of the prominent symptoms of a problem with torque converter lockup, is that the engine will rev up and down while it is idling. This may result in a stall, but mostly will cause the vehicle to lurch forward when not in park. Engaging in Gears Randomly
What happens when a LB7 injector leaks at idle?
When an LB7 injector begins to leak, you’ll notice the truck hazing at idle and you’ll also be able to observe abnormally high injector balance rates (the amount of fuel each injector contributes to maintain a smooth idle) with the appropriate diagnostic equipment.