extended cranking sometimes

[thenubsterman]

Hey as the title says i hav on e an extended cranking issue sometimes. its an 04 f350. I have no codes. It will do it sometimes warm sometimes cold, and sometimes its just perfect. I need some help I'm a tech myself but diagnosing powerstrokes are new to me we don't see many of them.

[dxusmc]

It could really be anumber of things. Could be lacking in fuel, could be low voltage in 1 or both batteries, could be high pressure oil leak (very common). Is it just slow cranks? or when it does fire up, does it kind of run like crap for awhile too?

[TommyBoy#1]

there was actually a flash for the 6.0 something for the injectors i believe we did that to my step dads 05 about 8 months ago due to the same problem you have and it fixed it just remember ford says 3-5 second cranking time. that may not sound like much but it really is

[dxusmc]

ah, yes I forgot to mention the flash update. Most dealerships will do it for you at the cost of 1 hour's time. Doesn't take nearly that long though.

[TommyBoy#1]

some diesel shops like mine do it also might call around might fine a shop to do it for cheaper

[thenubsterman]

well when it fires it fires just fine hits on all cylinders, it cranks over fine, just a lil long sometimes. How would i see if there is a leak in the High pressure oil system?

[TommyBoy#1]

personally i would just do the flash i understand its just a long cranking issue thats all my dads was and a few other trucks weve done

[TommyBoy#1]

here is part of the explaination for the update

early 6.0L injectors often experienced stuck or sticking spool valves, although it can occur on any model year engine. Depending on which position the spool valve gets stuck in, too much oil can be allowed to flow in from the high-pressure oil rail (stuck open), or not enough oil can flow in to activate the injector (stuck closed). Midway through the 6.0L's five-year production run, Ford phased in an FICM re-flash called "Inductive Heating Flash" that fixed sticking spool valves in the injectors.

[thenubsterman]

ya I did that on my fathers truck, back when I had access to ford scan tools. hmm thats probably what I will do.

[dxusmc]

there's a thread somewhere in 6.0 motor problems that explains testing your high pressure oil system. I know it involves some shop air and listening for hissing. I just don't recall where you plug the nuzzle into and I'm also assuming you have to drain the oil...I could be wrong though.

I tried searching for the thread and I had no luck. But it must've been titled something like cold start, rough start, skipping or something of the sort b/c that's what I've been trying to troubleshoot myself lately.