Dt466 ipr valve or icp sensor

When the sensor goes, the ecm results to default values to keep the engine running, so a bad sensor will not cause it to sputter out.

 

Sounds more like a fueling issue or possible cam sensor. You have to realize, this isn't how I work or how I do my job. You are guessing and blindly throwing parts at it. I would never do that and would get fired pretty quickly. I understand you have a datalink problem and can't read codes or engine data from the ecm, but this is the proper way to continue to diagnose this. Your next step is to fix the datalink so you can properly read what is going on with the engine. ECMs are rarely bad and typically do not cause sputtering problems either. Either they work or they don't. If your engine has the compucheck fitting on the top of the fuel filter cap, you should be taking a mechanical fuel pressure reading from there. Should have about 60 psi of fuel pressure.

 

Again, you are looking at bad data. Those engines do not make fuel pressure that high. Only 60 psi. What you are probably talking about is ICP pressure which is actually oil pressure used to fire the fuel injectors. I read your readings before in your other post and didn't know how to respond because that made no sense to me. ICP pressure needed to start your engine is about 600 psi. The high pressure pump will produce 4000 psi when the IPR valve is full fielded. Not sure what you are talking about in regard to pressure at one end being 4000 and only 900 at the "other end".

 

Manual fuel pressure test is your next step. If your engine has the test fitting at the top the fuel filter cap, you can check there, if not, there is a schrader valve near the front the intake manifold at the left front of the engine.