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the diesel engine is a 6.0L or a 6.4L? because the 6.0L don't use electronic throttle control. they control the demand of diesel threw the high pressure oil system they have a sensor call injector pressure regulator. this sensor is responsible of maintain the proper pressure in the high pressure oil system so that the engine could start . i also suggest you to check if it is any leak on the high pressure oil system or if the low pressure system is delivering the pressure required for the high pressure system to work properly. to do that you most have a scan tool. also you can check the pressure of the diesel pump that its in the chassis to eliminate the high pressure oil system as the cause of your concern. if u don't have the proper gauges to check the pressure of the diesel pump you could remove the cap of the small fuel filter that is next to the oil filter remove the filter and put the ignition switch in the on position and see in the container ifyou haveafastorslowfilling. if you encounter that the filling is too slow then your problem is with the fuel diesel pump that is on the chassis this pump is called HFCM, Horizontal Fuel Control Module
Im confused how do you have a direct inject diesel in a truck made 3 years before ford had such a thing 94(suposed to ) has a indirect inject diesel there is no electric wires running to the injectors there's only a pipe with very high pressure fuel running thru it
are you sure your not confusing the glow plug wires ?
they only get power to them for like 30 seconds when first starting it
If you are talking about the new ford ford 6.4 diesel or cummins or duramax, it will take a little longer. They are common rail and pressurize the diesel directly with a pump, the 6.0 uses high pressure oil to pressurize the diesel in the injector. Because of the extra step it can take longer to start the engine.
the high pressure pump provides the pressure to your injectors so the diesel luel can be injected at high pressure. You should fix this immediately. Call your dealer and ask for some help from Ford on the repair cost ahead of the repair. See what they will do.
there is a pipe witch runs from the diesel pump to the turbo which monitors pressure. sometimes a thin membrane in the pump goes releasing diesel straight in to the turbo especially on tick over. eventually that diesel is sucked in to the engine along with all the other gunk where it starts revving up on its own rattleing and banging. i have come across this on lucas diesel pumps before