Motor ran fine but we had diesel in the coolant. Removed heads and they were warped but the machine shop said they could save them. So they milled. Took several months.

once we got it Back together we had a ton of white smoke. Boiled it down to injector or injectors dumping fuel. Just never could settle
on solid 8 injectors that would work so I finally broke down and purchased a new set.

it starts

started it today. Sounds great when it’s running. But, it keeps shutting off on us. If i hold my foot down on the Pedal, I can keep it running. W foot on the pedal, it hasn’t quit but as soon as i let up it’ll die within 30-60 seconds

Oil pressure on scanner looks solid, and fuel pressure on manual gauge pressure are solid. Syncs and voltages all look good. Rpm’s looks fine. I don't really see any indication on the scanner that would say - it’s going to die imminently. It just dies. Even if it gives a little fuss to restart, it will in a few more cranks go ahead and start up idle then die again.

what am I missing?

 

Whats your IPR% and ICP psi when it dies?

 

thanks for responding. Icp was starting off little high at first. 1,000ish. But has settled down to 800ish. I pulled the plug on it to see if maybe it was bad. It’s an old sensor.

ipr is 30% range. Couple times dipped into 20 range. Nothing seems suspect and it sounds so damn smooth so I suspect electronic something. None of the key factors are ringing a bell right now.

and, it’s an 06. Hpop is strong on it.

 

Which DTCs are listed?

 

left the shop before I got to check them again. I’ll update 8am

but at last check, it was typical stuff. Anything I’ve swapped motors I always start it wo turbo tubes, fan, air box, radiator or any coolant goes in. We let them idle up to normal idle temp to make sure they are going to run right before investing all the time of all that stuff. All the codes that go along w those items were coding. Plus we had pulled the drivers bank glow plugs bc that was the side suspected of over fueling w the original injectors.

My experience is if it’s bad enough, it’s a no start. If it runs, it might run rough but sounds like ****. It sounds as pretty as any 6.0 I’ve ever heard right up til it does. Goes from 800 icp to dead. 70psi fuel gauge to dead. It doesn’t get rough at all. No stumble. Just boom dead.

didn’t run a buzz test bc the injectors were so loud at key on you could really tell difference but I’ll check on that as well. Seems like it idles longest cold. Then once it dies, it start dying quickly thereafter.

 

I do have a cluster communications code not linking w an unknown module but the last time I had something like it was an 05 excursion and it ended up being pcm but it wouldn’t start at all. None of the other modules or pcm report comm issues

 

tcm, abs, tbc, rcm - none
ic - u1900-20 but w all the other modules reporting none or some codes, can't imagine whats throwing it but its def new code

obd2 - p0113 iat sensor
glow plug codes which are unplugged

pcm
p0098 intake temp unplugged
p0113 iat again
p0480 cooling fan unplugged
more glow plug codes unplugged
p1000
p1102 maf (unplugged)
p2285 low pressure - not sure how this is set. the realtime sensor showing 833ish psi when it dies. might have to opt for manual gauge later today and verify
p2614 - camshaft - it doesnt set right off the bat. i have to crank it several times to set this code and i understand excessive cranking to cause this code. ill try a new one if all else fails
u0306 - software incompatability - been on there since i owned the truck - 5 yrs

not a big parts thrower. never works out. once again, truck and injectors sound really smooth and strong when key on and when it runs. abruptly stalls out at idle. typically restarts pretty fast. occasionally, i have to crank it over couple times to get it going, but it will start. when i start it cold, it runs several minutes before getting into this stall routine. after it gets warmed up a little - it will stall in under a minute, maybe 30 seconds, but definitely less than a minute.

when this truck went down - we took it offline it ran up til the day i parked it and decided to remove the motor and fix the heads, so i don't suspect the fuel, but i guess it could also be bad diesel i suspect electrical, but any thoughts be appreciated

 

Post the ICP sensor volts KOEO, cranking, and idling. You can't always tell for sure what the ICP pressure is without also looking at the sensor volts.

 

icp v koeo forgot to check before i started cranking but right now its .2v for 75psi and cranking its jumping as pressure goes up.
so, at idle, it starts straight to icp 1,000, 1.4v on the icp, and mid to high 30's on the ipr. it drops to the lower 900's icp w around 1.24v and low 30's to high 20's on the ipr. icp is now running at 850ish and about 1.2v but its now stalling within seconds of starting. once it does start, its very smooth and even sounds good. just cant keep the damn thing alive. lol

 

I hate to just be guessing, but do you have a known good FICM to try? From your description, it sounds like fueling (ie keeping the pedal depressed can keep it running).

 

i have another one i'll try a little later today - thanks for reminding me. but, i tried it w the bad injectors previously. it died and smoked then lol Its worth a shot bc its also on the fritz and needs some work so its already loose in the truck. back later

 

Just re-reading the posts....

So you haven't had this out on the highway yet after the injector work? Can you keep the idle high enough to prevent it from shutting down so that you can get it out on the highway for a good run?

 

I think it’s possible. Hasn’t died once in shop w my foot on pedal. But, it’s a few stop lights and signs to the highway. I know I’ll have to restart each time. Maybe tonight after rush hour. Lol

as far as ficm is concerned. The voltage stays pinnned to 48. Occasionally I see 48.5 but it doesn’t moved a bit. Seems like I watched a diesel tech Ron vid where he says ficm voltage will drop when bad

 

LOl, and maybe don't get too far from home base.

 

Took the truck out on the highway. No more white smoke. It’s gone.

however, it continues to die almost Everytime I take my foot off the pedal. Idle in gear is best way to get it to shut down. Occasionally it will die in neutral. It tends to stay running in neutral now but i throw it in gear wo my foot already on the pedal and it’s dead.

idk. Cam or crank shaft piston sensor or maybe the icp is throwing a value that is too high for actual. That’s all i got. Don’t know what could be causing it.

got great power. Drove it 80 today. Sounds smooth. Not warm or hot start issues. Starts right back up but just dies out when in gear at idle.