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Common Diesel Injector Problems

Like with most engines, when you have a diesel, you’re bound to have a problem sooner or later. Diesel engines can be complicated as they’re made from computer controlled parts. There are plenty of common diesel injector problems that may occur, but luckily many owners have suffered the same struggle and have uncovered common issues. In this article, we’ll be listing a handful of the most common diesel injector problems.

Crank Time Issues
One of the most significant issues with crank time is knowing if there’s anything wrong with the pressure. Average crank time should only be three to five seconds at max, any longer or shorter and you’re looking at a bigger problem with pressure.

Cummins suggests that starting with a visual test can help locate your problem. It’s best to remove the valve cover before cranking the engine. After that, use light to inspect the injector body. If there’s a crack, you may be able to see smoke.

If there isn’t a crack, then the next step is to isolate each cylinder. To do so, you need to cut off the supply of fuel. Start by removing the hard line located right between the fuel rail and the injector site. From here, put the cap on the fuel rail and then start the engine. If the time is reduced, then that’s the problem. Complete this process with the second cylinder.

Sudden Loss of Power During a PowerStroke
A sudden loss of power could be from a malfunction during a powerstroke. The problem is, if the engine is resting and idle and the high-pressure oil is precisely where it needs to be, which is 600 psi, then the injector and piston will start to move downwards. However, the fuel in the delivery chamber may be forced through the injector nozzle and skyrocket the psi to 4,200. This is a spike in the injector spool valve, and most often you’ll notice this problem through the engine’s sound.

If All Else Fails, Check Oil Levels
Another serious issue is using the wrong kind of oil for the engine. All types of oils have different viscosities, and if the engine isn’t compatible, then you may face problems. However, most engines function by hydraulic pressure, and if the oil starts to build up air bubbles, then it will begin to foam. This can enter the injector and start to cause misfires.

To release the foam, you’ll need silicone to help release some of the agents. We suggest after removing the oil that you change it to something the manufacturer recommends or one that works with the system. Injectors are fickle. Therefore, you need to clean oil deposits and buildup of scum over time.

Last Resort, Start Scanning
If all else fails, then you’re going to have to run a full diagnostic. There are multiple methods for locating the problem, some of which can be solved by doing a diagnostic scan. However, there are also times where you may need to take a look at the whole injector.

Conclusion
As for what we recommend, we’d suggest bringing the vehicle to one of our Taylor Diesel locations to have testing done on it, as this will be able to locate most of the issues related to injectors.

CategoryBlog, Injectors

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