Hi everybody, first let me tell you I don´t really know much of this engines. I have (in my work) a 2006 6.0L F-450, and I have a problem with it.
It starts perfectly when cold, and runs very fine (I have just used it for a 6 hours trip, with 6 tons up). The problem is when I shut it off, and try to start it again. It cranks, but not fire up. If I let it cool down (about 30-40 mins), it again starts with no problem. Also if I put a little gasoline or starter in the intake air filter, it starts inmediately, even warm. Also if the truck is running, if I turn it off and try to start with ignition key, it doesn´t start, but if I put 4th or 5th gear, and take out the clutch, it starts inmediately and very smooth.
We have taken this truck to a service shop (here in Monterrey the dealers don´t know much about this trucks, the service shop I went was recommended by a dealer, because they are not ready to service this engine), and they have done a lot of things, but the problem is still there. Some of the things were done are: Changing 6 injectors, repairing the heads (with all the associated cost), and adjusting the relays box.
Let me tell you that the service engine ligth is not turned on, and that this problem is only when the engine is warm
Do any of you have any suggestions? please use common words, I´m a real rookie in this