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James, Ford Technician
Category: Ford
Satisfied Customers: 3628
Experience:  Ford Senior Master Tech, Ford gas and diesel expert, ASE Certified
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f350: Truck running very rough. Code for p0272 and p0284 cylinder

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Truck running very rough. Code for p0272 and p0284 cylinder 4 and 8 contribution faults. How do i diagnose if it is for sure injectors?
Typically if the FICM voltage is ok and the engine has good compression then it is injectors. If there are only contribution and no other injector circuit codes then more then likely you will need injectors. You can perform a manual compression test by removing the glow plugs.
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