longer cranking times

[melmount]

I am asking for a friend on an 03 6.0, What can causelonger cranking times?
Its been warm here(summer time) morning firdt dtart of the day or after it sits for a couple hours is the same.
Glow plugs can cause it when cold in am(winterry times)
what else? how does the hpop effect it?

 

[DaveBen]

The PCM will not inject fuel until there is at least 500 psi in the high pressure oil system (hpop). Building up to the 500 psi may cause longer times than normal.

Dave

 

[melmount]

thx Dave B
ok, an injector leak could cause the leak down??
glow plugs could cause it but its not cold.
how about the ficm? trying to know what it could be?
I guess, I am looking for all possibilities.
What am I missing?
weak batteries,
ficm,
hpop and its related issues,
fuel filters,
glow plugs,(not cold though)

What else is there?

 

[DaveBen]

Think HPOP and that stands for the High Pressure Oil Pump. You may be not pumping high enough oil pressure and that maybe due to a High Pressure Oil Pump going south. I don't think the FICM is the problem because it works. Weak batteries would my Number One cause. Replace BOTH of your batteries and see how it works. Wrong time of the year for glow plugs. I can also recommend changing the fuel filters (two).

Dave

 

[nc1500]

I am asking for a friend on an 03 6.0, What can causelonger cranking times?
Its been warm here(summer time) morning firdt dtart of the day or after it sits for a couple hours is the same.
Glow plugs can cause it when cold in am(winterry times)
what else? how does the hpop effect it?

This is a quote from the July 09 issue of Diesel Power:

"Gilbert Garcia of Diesel Tech told us he sees at least one truck each week with a blown oil rail plug. The most common symptom experienced when an oil rail plug fails is a long crank, no start situation"

Does your friend's Ex show signs of oil leaking from the back of the engine? That may be the second clue. Though much more common on 05-07 models (possibly due to the more restrictive EGR cooler tube design), they still fail on the earlier 6.0s and cause much frustration.