I just bought a 00 F-350 with the 7.3, it has 161k miles on it. It has a Western Diesel pakage on it with 4" exhaust, ram air unit, 4 stage switch on the dash. It has the larger looking turbo on it and it looks new (not sure if it is stock replacement or what, I just know it is more than double the size of the turbo on my friends 99). It runs awsome above 2200 RPM, below that it runs rough like it has a miss in it, it is also very slow to start and if it is colder than about 65 outside, I have to plug it in, or it is nearly impossible to start. It also has alot of blow by on it, and I used it this weekend to pull a car and it ran great as far as power goes, but on a 800 mile trip it used 6 quarts of oil.
So to sum it up:
Hard to start
lower RPM miss or rough running
bad blow by
drinking oil like fuel
also has a strange knock sound at lower rpm
OK, now here is what I have done to fix it but none of it has worked,
new glow plug relay
all new glow plugs
checked the wire harness for the valve covers
replaced #8 injector (computer at Ford dealer flagged #8)
I am at a loss guys, I like the truck and want to fix it, but I don't want to keep throwing parts at it.
Thank You in advance for any help.