My 06 6.0 I bought used about 5 years ago has been great. But recently it has been slower to start and getting worse. It starts fine cold, it's always ran a little rough but it's a 6.0. But after it has been running it won't start back up. I'm figuring it is HPO problem. I'm a Ag mechanic but really hate working on my own stuff. I've heard of similar problems just thought I'd ask and see if there were any others with the same problem.
No start when hot is usually a indication of a HPOP system leaking, (HPOP, stand pipes, dummy plugs, STC). You'll need to do a air leak test to pin point the location.
If you have a monitor, you can also confirm a HPOP system leak by checking the ICP pressure when cranking the warmed up motor.
A 6.0 shouldn't run rough, should run very smooth if the motor is heathy. Do you have a monitor to check FICMv, pull codes, Fuel psi, ICP, IPR, EBP, EGR? A rough running 6.0 is a indication of a issue (bad or dirty sensor/actuator, wire or plug damage, blocked hose/tube).
"Rich is really good with knobs, his soft touch and attention to detail are like no other."-Portcity_gt
I would also suggest the air test, but if you haven't updated any of the following, I would suggest you do it while in there.
- Dummy Plugs
- Stand pipes
- STC Fitting
It's likely that one of those are your issue, but air test once they are swapped to ensure you don't have any other leaks. Injector top O-rings and oil rail ball tube O-rings are also possibilities.
New problem, was moving the truck, same 6.0 and it would shut off when I turned the key off. It took a few seconds for it to shut off. It did it three times, I thought I was losing my mind.
If truck stays running after you turn key off, then it's a sign fuel or oil leaking into the cylinders, could be turbo seals, injector o-rings or copper seals.
"Rich is really good with knobs, his soft touch and attention to detail are like no other."-Portcity_gt
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