Thanks for the encouragement guys. Sorry for not updating the thread, IG is too easy. This thing has consumed every waking moment for at least a month now. So here is the update.
Got the motor back in.
Like Paul says, I was super nervous. This is a huge investment of both time and money. If I screwed up it is going to hurt. But this is basically a push rod small block. It should be easy.
I go to start it and........... no go.
I was pretty frustrated. After checking all the quick and easy things with no luck I took a day off to cool down and regroup.
Here is where I sit now.
The engine is turning 150-200 rpm which is enough to fire it.
6.0's take a lot of cranking to refill the high pressure oil system that is required to fire the injectors. I filled it with oil through the filter housing and it primes much faster. This extended cranking usually throws people for a loop and they think something is broke.
My ICP is reading 1500psi, requires 500 to fire, so high pressure oil is good.
IPR sensor is only 54% duty cycle while cranking so it is sending oil to the injectors so that is good.
FICM is reading 47.5 volts while cranking, anything over 46 is good.
Now for the more in depth stuff.
To determine timing, the motor uses a crank position and cam position sensor. It sends them to the PCM and that sync signal goes to the FICM (fuel injector control module) and fires the injectors. I have to FICM Sync per my scan gauge or my Edge CTS.
I do read RPM, that comes from the crank sensor, so I know that is good. Replaced the cam sensor and still no sync.
I had the harness out on the bench checking for chaffing so I figure I could have broke a wire. So I track down the signal to the middle plug on the PCM, pins 31 and 43. This is a reluctance sensor, basically a magnet the changes states when a ferrous metal object passes by it. So I check the resistance, 800 ohms, that good. Crank it over and I get 100-200 mv A/C at .9 Hz, which is good. So the PCM is getting signal.
I swapped a PCM from my father in law's truck that is running, still no sync. So I am down to a bad FICM. I pulled the original one and checked all the pins since you have to plug the harness in blind. The pins are all good. Will swap a good one in tonight.
Hope to have it up and running before Christmas. I am sure I have taken 10 years off my life stressing about this thing but it is satisfying to identify an issue and resolve it. Plus, I will have a brand new, much better than stock engine and I know 10x more about it than before. If it every breaks down, I am pretty confident I have the knowledge to find the problem now. That piece of mind is nice, especially when you drive a 6.0
