i have a 2006 f350 diesel sometimes it will start cold or hot then it will just crank over and not start i have changed the high pressure oil switch to no avail
the same thing happened to my friends truck it turned out to be the starter was not turnig the engine over fast enough to get a good amout of fuel into the engine. i dont know if that could be it but its worth a try
try this site they have lots of info on the powerstroke
http://www.ford-trucks.com/forums/forum107/ sorry i forgot to paste this address
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