Medium and Heavy Trucks
Have Truck Repair Questions? Ask an Expert
Thanks for asking your question. I will try and help you out.
Does the engine have low power?
Does the yellow check engine light come on while driving?
Thanks for the information.
There are several things that can cause low power on these engine and no check engine light. You have already checked or replaced two of them. Cooler and turbo.
The first is low fuel pressure. The engine should maintain 35 psi at all times. If it's low, you most likely have a weak fuel pump or restricted fuel inlet line.
Second is a restricted fuel return line. When it's resticted the fuel will stay in the pump too long and get hot.
Third is a faulty rack position sensor. They have been known to read off and cause low power.
Please reply back if you need more help or have more questions. I am happy to assist.
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