Medium and Heavy Trucks
Have Truck Repair Questions? Ask an Expert
Hello there! I am a qualified Heavy Equipment Technician here at Just Answer, I will help you diagnose and repair the problem you are having with your DT466E engine.
I have had similar issues to the one you describe on the DT466E engines and there can be a few solutions to the problem. The first thing I would check is the ICP (ignition control pressure) or the oil pressure that pressurizes the fuel in the injectors. This pressure is vital to the proper operation of this engine. Monitor the ICP with your scan tool both at idle and under load and let me know what the pressures are at. Even the smallest leak in this high pressure oil system can cause a no start, hard start, improper idle, or low power issues.The other common issue with this engine is the fuel lift pump. Fuel pressure can be checked using a T adapter on the output line of the fuel pump. Fuel pressure should be greater then 7psi.Check these things and let me know what you find!PS- I wouldn't let the engine load number worry you. I have noticed this number being abnormally high as well even under normal operating conditions. I'm not sure what inputs international uses to calculate the engine load, but it is not very accurate!
Yes, I did mean the injection, thank you for correcting that.Have you ever encountered any communication errors with the truck. Another common problem with these trucks are the power to the ecm. Have you have had the truck no start? Surprisingly enough, even the slightest bit of corrosion on the battery posts can cause some really, really strange problems.
The scanner will communicate fine with the ECM with an intermittent voltage drop, but can still cause engine issues. Just something easy to check. I have diagnosed these engines for hours, only to clean the battery posts/cables and have the problem disappear. Sounds odd, but trust me on this one!Let me know the ICP running pressures when you have a chance.Derek
Good Morning,According to the readings you provided, your problem definitely lies in your High Pressure Oil system. In order to repair the problem. Complete the following steps:- Disconnect the IPR valve's electrical connector and start the truck. If the engine's ICP pressure stays constant, your problem lies in the electrical from the harness to the IPR valve, or the IPR valve itself.- If the ICP pressure does not stay constant, you have a high pressure oil leak that will need repaired. In order to find the leak , disconnect the high pressure oil line that runs from the pump to the left side of the cylinder head. You will need to attatch an air chuck connector to this line to fill the cylinder head oil galleries with air. Apply the shop air and listen for leaks. Using a stethoscope can be benificial to locating the leak. Once the leak has been located, dissassemble and repair the oil leak!I am happy I could help you out this morning, and if you have any other questions, I will more then happy to help. If you could leave a rating on how my service was today, that would be very much appreciated.Thanks so much,Derek
Sounds good, let me know what you find!
As a technician, you need to not get side tracked and focus at one problem at a time. The problem you are having is a high pressure oil issue. It is in no way related to your brakes, or your charging system. Complete the steps I provided above and they will lead you to the solution of your issue.
I agree, you definitely have a HPO leak! Please diagnose as I described above and your problem will be repaired, guaranteed! Please leave me a positive feedback rating for diagnosing your problem.
This really depends on the manufacturer, can't help you much there as I don't have access to whichever manufacturer supplied them.