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This is a 6.9 IDI that I'm installing in a customer's rig. I found it at a local wrecking yard, and unfortunately the IP gear cover had been removed.
Picked it up for $300 including 4-speed transmission, with a set of injectors, IP, lines off another (siezed) 6.9.
Spent a few hours getting it all back together, guessed on the timing(get engine to TDC on Cyl #1, install timing cover with Y down) and then tried to get it running.
As you can see, I had a few issues, and things of note:
1. Without any fuel, ether(at least the cheap stuff I was using) /will not/ fire in this engine. No popping at all.
2. This is basically the minimum needed to get an IDI running - fuel supply to the IP inlet(I did use the fuel filter too), from a jerry can; power to the FSS solenoid and an E-pump(which I got for free with the engine).
3. My timing 'guess' was probably 1-2 teeth retarded; once I advanced it one tooth, it wanted to fire(and then my ground lead fell off). After running it for a while, I found that it still is a bit retarded; I'll probably check it with a lumy probe later and go from there. But it fires up nicely now.
4. This is an older Napa "direct drive" style starter(Note: it's /not/ direct drive), and as everyone can see, it cranks over quite nicely... at least with one good battery.
The first battery I was using is a 750cca Optima dual-purpose battery that is 7 years old... and I had already been doing some cranking with it.
This is also a 6.9 "A" block, SN in the 55,000 range... which makes it an 83?. Not great, but it still runs and should work fine in the truck which is probably going to be a plow truck.
The 20.5:1 compression is probably also why it doesn't want to fire off ether alone.
Also, let the ether haters hate!