I could use some advice... I've got an early build (12/02) 6.0. There's currently about 130k on it and back in late '08 it got new headgaskets, studs, oil cooler, coolant bypass filter, etc. Almost 2 yrs ago it got 8 new injectors and has been running great ever since. It's also got a Banks 6-gun/intercooler/exhaust, etc.
I should also mention that I've installed a vegistroke system so I have the ability to run off veggie oil using a separate fuel system.
So, driving home from Duluth, MN to Mpls, pulling an empty 24' car hauler, I noticed black smoke (about 140 miles into a 200 mile trip). No loss of power or anything else. Made it home just fine. It was due for an oil change anyway so on the off chance it was a stiction issue, I added 2 bottles of Rev-X. After the oil change, the truck started fine but died once up to operating temp, then a no start when hot issue (no power, chugging, etc.). Would start again when cold but choke and die when hot.
I don't have a scan tool so I checked the FICM and it tested out at 47.1/47.5. I then bit the bullet and replaced the ICP sensor and the IPR valve, hoping that might solve my issue. I also did the "blue spring" update at the same time.
I then started it up on diesel - it smoked at startup, first white, then it turned black quickly with a concentrated diesel smell. However, it ran great, even after hot - no more chugging and death once hot - that problem seems fixed. Once I road tested it, it bellowed out black smoke and looked like I must have been towing a burning house. Must have killed off a few mosquitoes, so that's a plus.
Thought it might have something to do with the blue spring upgrade so I switched over to the veggie oil but still smoked a ton so I've eliminated that as an issue. Interestingly, running on veggie and at idle, there's no smoke, but when I switch back over to diesel (at idle) it smokes a ton.
Again, the truck runs great - best on veggie oil (100% lubrication) - super quiet and no hesitation, but smokes like there's no tomorrow.
I'm thinking of ordering an AutoEnginuity scanner (my wife drives a Ford too, so it'll probably pay for itself eventually). Until then, any ideas what I should look for next?