Injector not firing

[rthammer]

Well,

I ordered another injector from Rosewood. Took it to local diesel shop. They pulled drivers side valve cover, since #4 was missing on cold start up, and checked compression. Came back as follows:

#2 350
#4 330
#6 360
#8 340

Are these acceptable numbers? Shop said they were borderline and could be reason for misfire. Notice 4 is lowest. Truck still smokes and #4 misses on cold startup.

Thanks for any advice!