I have an 03 International with a 466 that keeps coming up with a low icp code (333) but only when the engine is warm and under a load. When desired ICP is 3200 I'm only getting around 2900. I tested the pump and regulator and it creates around 4500 when cranking. That told me the problem is under the valve cover. After replacing the injector o-rings with OEM, it still has the same issue. Could an injector cause low ICP and if so, how do you find out which one? Anything else I should be looking for?
we took a porta power filled with cj oil fitted it to a guage and connected to high pressure line going to head. pressure up to 800 psi. check for leaks.we added dye to oil. hope this helps.we went through several hit and miss with shop air