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The 7.3 PS will run on 4 cylinders, not very well, but they will run. If your HPOP pressure shows 2200 PSI of pressure, then you have more than enough oil pressure to fire the injectors for start. How many miles on the rig? I pull the valve covers off and make sure the injectors are firing while turning over. You will actually see the oil come out of the oil spouts on each individual injector. If you see oil then the injecotr is okay. Also, a buzz test only makes sure the solenoid on the injector is working, it does not mean the injector is working properly. If you have a badly worn injector then the solenoid will not be able to mechanically operate the injector. If you need your injectors rebuilt call Rosewood Diesel. If you have any other questions feel free to PM me on here.
99.5 F-250 4x4, 7.3 PS
State 1 injectors from Rosewood, GT38 (van) turbo, S&B intake, Comp Cam's 910 valve springs, Smith Brothers pushrods, AIH delete TS 6-position chip. Pyro.
2005 front end conversion, 2008 tailgate, taillights, and rear bumper.
Edge CTS monitor, and 4" Exhaust (Manufacturer to be determined).