help long crank time

[abach]

05 F350 6.0 long crank time. my truck will crank for about 5-6 sec before it will start, and 2-3 sec when its warm and been running for a while. does not seem to matter what the outside temp is. Had it at dealer, Reflashed the computer, no change, also no codes showing. Asked about glow plugs or relay and they said there are no codes showing for that. I changed the fuel filters and oil 10w-30 nothing seems to help. Once the truck is running it runs great no lack of power or rough idle. Any Ideas?

[Jarrod B]

its the glow plugs or you are getting air in to the fuel or oil system.

[abach]

If it's the glow plugs, should it not show codes?

[Jarrod B]

to my knowlege, i havent heard of glow plugs giving codes. the relay on the other hand might be different.

[Cj Ford]

check your icp ... thats what was wrong with my 7.3..I had extra long crank time to start changed it out starts real fast now

[jonesiert]

I'm a little new to the diesel so excuse the lack of knowledge but. what is the ICP?

[flatbedin]

With it being a 6.0, I would start by tracking down any oil leaks in HPOP system. Sound like the system is bleeding off pressure, then once you try to start, after a cranking period the ficm is finally seeing the min pressure of 550 and allowing the truck to start. My truck did the same thing, and although there are many places to look for a oil leak, the symptoms seem to start by long cranking time. Being an 05, I would start by looking at the STC fitting. If it has not been updated, the STC fitting will blow apart at the male/female quick disconnect (or just barely seperate like mine did) and allow the truck to fire after long crank times. Then finally one day you'll be sitting somewhere, and it will seperate all the way, and you'll be stranded.. The original design on the STC was POOR, but that just my .02.. To look for a oil leak, remove icp sensor and apply shop air, command the IPR valve closed and listen for leaks on the passenger side through the oil fill tube, driver side through the pcv tube. Or attach air through the test port on the HPOP pump itself and if it's the STC you will hear air gushing from under the cover. Hope this helps.

[cliford]

Originally Posted by jonesiert

I'm a little new to the diesel so excuse the lack of knowledge but. what is the ICP?

ICP injector control pressure sensor. it montiors your high pressure oil levels. its located on the on the top of the drivers side head close to the front and sorta in the valley. at least that's where its located on the 7.3. What temperatures do you see where your at? does the truck start fine if plugged in over night?

[umfhockey66]

Subscribed, I'm having the same issues.

[flatbedin]

On an 05 your ICP sensor is on the passenger side valve cover towards the front. You will see a little silver box with two connectors (your glow plug module) next to it towards the motor there will be a goldish screw in sensor with a three wire connector going to it. That is your ICP.