First problem. A used motor you just put in there... Didn't check it out?Run voltages on sensors? Just because it doesn't have blow by doesn't mean its been maintained or doesn't have worn out parts.
Second problem, didn't pull codes while trying to start it? Didn't check all parameters? That's why it has electronics. Emissions was minimal at best back then. The computer in that truck has less computing than an app on my phone. The point of putting it on in the first place was so you could take it to the dealership and they didn't have to warranty the whole motor because it won't start...
If you worked on motors for so long, why didn't you buy a good one, blueprint it, replace all the sensors and make sure it was good to go before install?
And if you really think a 6.0 gm is better... Get a medium duty truck with a gasser engine. If you can. That's how useless gassers are at towing and being work trucks
Diagnostics, on pre 99 powerstroke, now that is funny. I may have more luck using my ouija board to summons the diesel gods. I can only guess that I have run the cylinder contribution test more than 25 times with
My solus, only to have system pass. This of course was on an extremely rough running truck.
The truck had 155,000 miles when i purchased it in 2000. At that point the engine, injectors and harness were already worn out. I have only put 65000 miles on the truck and it has left me on the side of the road and in need of a tow 4 times. The list of parts on the last engine included 8 injectors, 2 cam sensors, wiring harness,glow plugs, water pump, and I am sure there is more that I am missing.
Mechanically the engines are very good, but the electronic management leaves much to be desired. I have changed oil every 4000 miles with rotella and have maintained the truck well. I am sure there are some great stories about the 7.3 powerstroke out there, just as you will find fans of the Chrysler 2.7 , 3.2 Cadillac North Star, Cadillac 4100, gm 6.5 turbo diesel, 6.2 diesel, Pontiac 301, cosworth vega, Mazda rx7 turbo rotary 93,94, Mercedes 600 v12. The list goes on.
The point of the matter is that I am in search of a more reliable alternative for this engine, which for me is not worth the trouble and money. It makes no power, gets so so fuel mileage 10mpg towing a 6500# trailer and kills me I. Maintenance cost. I drive it less than 7000 miles a year, it has always, and many trucks that I follow, smell like worn out freight trains, which really isn't fun to breathe anymore. Hell my kubota diesels are great, but the affinity for the 7.3 has left the earth.
You guys please do your part in keeping the Economy alive by fixing what ails the powerstroke, keep up the good fight and spend your extra time keeping the trucks running, but this relationship is one sided and I for one , am out.