06 6.0 starting issue

[bkingsley11]

I'm having a slow start issue that is I'm having a hard time pinning down. Sometimes i have to crank the truck for over 15 seconds until it fires. It seems almost worse when it is warm then cool. I was having the same problem a month ago and took it to the dealer because it was just in warranty they replaced a glow plug and the FICM. when i picked the truck up it still started a little slow but much better and i had no time to screw with it. since i picked it up it has been getting progressively worse. i have pulled a full service on it and replaced the batteries because they weren't perfect. I did find a small leak on the engine mounted fuel filter and i have the parts coming. any other suggestions would be great.

[Dave]

Sounds like a High Pressure oil leak.

You still under warranty?

[kingranch250]

Originally Posted by Dave

Sounds like a High Pressure oil leak.

You still under warranty?

i second that.

[bkingsley11]

i was actually three days out of warranty when they fixed the FICM but i convinced them to cover me. I don't think they will go for it again. I was also thinking it might be the high pressure oil pump. Is there any simple tests to check my pressure to be sure that there is a problem in that system.

[bkingsley11]

tested the voltage coming off the icp while cranking today. Voltage was about .62volts while cranking when the truck finally started after 10 plus seconds cranking the voltage jumped to 1.25 and then leveled off at .82. I think i must have a leak in the system but from I'm reading the truck should not start with less then .80 voltage (500 psi) but mine does. Any ideas would be appreciated.

[shyoung]

Just got mine back today for same problem. STC connection to high pressure "rails" and leaking "Dummy Plugs". Parts are cheap, but about 11 hrs labor! Even after repair it will have longer crank time until all air is out of system.
Mine has always been fine with 15w-40 oil, so I don't think that's a factor.

[sinner6.0L]

Originally Posted by shyoung

Just got mine back today for same problem. STC connection to high pressure "rails" and leaking "Dummy Plugs". Parts are cheap, but about 11 hrs labor! Even after repair it will have longer crank time until all air is out of system.
Mine has always been fine with 15w-40 oil, so I don't think that's a factor.

mind if i ask you how many miles on your truck?

[shyoung]

109,000. Just put a 1,000 on it the last 2 days since repair and every aspect is better. No long crank, starting better cold, and seems like better fuel mileage.
Steve

[shyoung]

Also, I noticed I had forgot to add in original message that it needed an FICM as well at this time. That may be part of the better starting, fuel mileage as well!

[Chango]

Looks like you got it taken care of, congrats. For anyone else reading this check out the oil thread in my signature, it helped my truck