The only thing I can think of is it broke a ring on one cylinder. I can think of nothing in an injector install that would cause crank case pressure to all of a sudden build like that, has to be a failure of something and the rings\pistons is the only way you are going to get pressure in the crank case like that.
Unfortunately that is what I am thinking too. Damn Damn Damn.
Trade truck off to a dealer or fix is now the question?
EDIT: 1. When cold (started at 0, now it is up to 40 degrees) it will not fire without ether. No smoke at all comes out the tail pipe. Injectors are not firing. Batteries are new. A quick 2 second shot to the air filter and then crank for 5-7 seconds and it fires fine, and then will fire fine all day.
If you trade your evidence the shop or replacement injectors possibly caused this goes with it - Shady shops recommend this action. Not saying they caused it because bad luck. But why the bad luck needs to be found before another engine gets wrecked. A sticking open injector doesn't take long to melt a piston down. I wonder if there can be a fuel leak into the cylinder from the injector install and/or if there could be a compression leak around the injector into the valve cover area. Lots of possibilities including damage from the old set. Engines can be rebuilt for under $10,000. The bigger question is if the battle with the shop is worth it. The condition of the rest of the truck would be a big factor. Rolling in 18 days depends on the machine shop backlog and everything going right. Is the deadline flexible considering the costs of engine/new truck?
So, time to do a compression and or leak down test after pulling injectors to narrow down the maybe offending cylinder (s) ?.
Dave