2000 7.3 please help

[wcracer7]

I have done many searches on here and havent found a anwser, a few of the post had the same symtoms but they ended with out telling what they found wrong.
I have a couple different problems i am thinking and i have been battling it for a month now when i have time. truck has 256k on it, i just bought it so i dont know any history on which sucks.prob#1 wont start enless plugged in, i have pulled covers and ohm checked harness's and glow plugs and everything was good there, did install new gpr and it cycles for about 11/2 minutes(about 15*f). i can get it to start with fluid(I know its bad) but it doesnt hit on all cylinders for about 10 minutes and most of the time u actually have to hammer on it to get the last cylinder to start firing(#2 cylinder). if i plug it in at night it will start in the morning but still misses on one cylinder until i drive it.very little grey smoke when it starts, unless you look for it you wont see any and no smoke when its turning over, when trying to start cold it does hit on some cylinders but not enough to get it to run.
prob#2 which seems to be getting worse is around 2000-2500 rpms somtimes it will pull down and start blowing blue-grey smoke untill u let off or mash the throttle then it stumbles some blows a big cloud of smoke them takes off like a streak, seems to do it more when running without a load going down the road and you can get it to do it almost always when in park sitting still, if you drive with out geting in that rpm range or hammer through it its fine, no other smoke even under big loads. we hooked up a snapon solus and this is what we got 1277 cyl 7 high to low side open(which is strange cause i have checked the exhaust manifolds with a gun and number 7 is always the same as all the rest of the cylinders hot or cold(when it is missing after initial start up #'s2,3,5 are colder than the rest). for memory codes it showed 1247 turbo boost low( i checked all boots, no rips and not blown off)1280 icp cuircut out of range(think this is cause i unpluged the icp with it running) next was 1316 idm codes detected(pulled idm and checked for corroded plug or water and found none). i have changed oil (15w40 rotella) changed fuel filter, pulled the filter cover off after running and the fuel looked clean (no oil). here is some numbers i took with it running if there is more i need just let me know and i can hook it up again and get them

idle
icpv.85v
icp 475lbs
pulse width 2.9

2200 rpms
icpv1.7v
icp 1180 lbs
pulse width 1.8

3000 rpms
icpv 2.8v
icp 2250 lbs
pulse width 1.7

we also did the 3minute wot and it was in spec but i didnt write down the numbers.

it looks to me like it is shutting the injectors down cause of the shorter pulse width but i am new to the 7.3, but i did work on tractors for about 12 yrs so the diesel engine is not new to me just all the sensors and the hyd firing ect. Thanks for any help Andy Jones

[wcracer7]

WOW 66 veiws and nobody has a response, guess i will stick to the diesel stop forum at least they give me some input.

[Buffalo444]

Just a WAG here, but it sounds like injectors. Have you tried clearing codes and seeing if they throw again? It doesn't do you any good to sit with a bunch of stored codes and try to diagnose your problem. IDK how the pcm measures boost (I'd guys its relative to rpm) but lack of fuel/combustion would cause lower bosst than it should. Hard starts lots of times can be attributed to weaker injectors... can you get a buzz test done? I've heard of hard/no starts being attributed to weak injectors. But it could be with bad compression too (worn out rings, valves that dont seat properly, etc) do you have any sort of haze when idling? if you do, what color?

And hang around a bit, we have some master techs on here that will probably have some input...

[wcracer7]

yeah i have pretty much come to the conclution it needs injectors, had the scanner on it all day today as i was hauling, pretty sure the injectors will fix the hard start but it still has the rough spot around 2200-2500 rpms that bothers me but injectors may clear that up to because i have noticed it is when im very easy on the throttle at that rpm range is when it does it the worst and that is when the pulse width on the injectors is about the shortest, when i have the skid loader and trailer (gross total 22000lbs approx) and i run it hard through that rpm range it doesnt both but the pulse width is also alot wider. guess i will bite the bullet and order some remains but not sure if i want stock or not, the trailer almost always has a trailer on it rather work or my 36' 5th wheel camper. not looking for alot more power cause i dont want to smoke trannies all the time but aliitle extra grunt somtimes wouldnt hurt. so who sells good rebuilt injectors that i dont have to morgage my house to buy lol?

[Buffalo444]

Swamps diesel. Plus they send you your injectors without a core charge so you can minimize down time. Then you just send your old ones in.