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Message: [QUOTE="windrunner408, post: 188656, member: 1868"] Unplugging the ICP sensor wont do you any good. The FICM needs to see 500+psi of ICP to fire the injectors. Unfortunately you need to hook it up to a scan tool to properly diagnose otherwise it is just a guessing game. If the FICM is fine and you hear the fuel pump run when the key is on, then you probably have a high pressure oil problem. Could be the High Pressure Oil Pump (diesel injection pump), bad IPR valve, blown HPO rail seal. My thoughts are if the FICM is good, if the fuel pump runs with the key on and engine off, and the truck/oil was "cold" i.e. close to ambient temp, then you have either a bad IPR valve and/or HPOP. Still recommend a scanner to diagnose. Oh yea you could have a bad cam position sensor and/or crank shaft position sensor. Best of luck to you. [/QUOTE]

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