2006 f-250 w/ 115k mi. the longer it sits without running the longer it takes to start up. i havent started cycling the glowplugs yet, but if it sits for 24 hrs, it takes several seconds to start. general starting is taking longer than it should, but the longer it sits the longer it takes to start?? has anyone ran across this yet?

 

Could be a number of things. Hard to tell without more info. Have you tried getting it scanned to see if any codes come up?

 

no i havent done anything yet. the check engine light hasnt came on yet.

 

It's not uncommon to have "soft codes" that don't throw a check engine light. It may still have codes coming up. Have you had your batteries load tested? Have they ever been replaced? That'd probably be the first place I'd start. From there, I'd test the FICM, then see if you can get a cylinder contribution test done after. Do it in that order. Start with the batteries though, that's easy to have checked.