Engine and wiring are 1991 Subaru Legacy. 2.2L, non-turbo, donor car was an automatic.
I have no spark.
Plugs are good. Brand new, right plugs for the car, properly gapped.
Wires are good. Brand new, right wires for the car.
Coil is good. Not brand new, but the primary and secondary resistances test good.
Igniter is unknown. I have two used ones, and have tried both of them with no change. Haven't found any description of a way to test it.
Wiring is good. Continuity to all the right places.
ECU is unknown. The original ECU is showing trouble code "3", which is ... bogus. Not an official code. I have a second used ECU, but it doesn't fix the no fire issue. It shows codes "35" and "49"; Cannister Purge Solenoid Valve Malfunction and Air Flow Sensor Malfunction. Purge valve code is a familiar one, this swap has had that one on and off since its birth. The air flow is a new one. I'm not sure of the exact origin of ECU #2, I know there were some variations to account for manual vs automatic and turbo vs NA.
Have power to the coil with the key on.
The cam and crank position sensors test good, both for resistance and AC voltage output with engine turning.
I'm so sure I've checked everything that makes sense, I'm starting to check stupid stuff. This doesn't make sense. Really hoping one of you can shed some light on this and show me where I've forgotten something critical. 
Is there a MAF connected? Lack of one may leave an open loop error code and a no-start condition.
Do you own a self powered led test light? If not buy one. They are a cheap and fabulous tool for stuff like this. Find a wiring diagram, and figure out what goes to and comes from the igniter. Generally speaking, every car will have something along the lines of 12v in, ground, a wire from the computer telling it when to fire the coil, and a wire to the coil to control it. Cranking, you should have a flashing signal from the ecu, power, ground, and a pulsed ground to the coil. No spark combined with signal from the ecu and signal to the coil= no power from the coil, or bad coil. Signal from the ecu and no signal to the coil = dead igniter. No signal from the ecu means cam or crank sensors or wiring or grounds or power supplies or ecu or mismatch of cam and crank signals or any one of a thousand other things.
Streetwiseguy wrote:
... cam or crank sensors or wiring or grounds or power supplies or ecu or mismatch of cam and crank signals or any one of a thousand other things.
^^^ This is the part that drives me nuts.
Don't have a test light, will get one this weekend.
There is a MAF connected, but it may not interface well with the other ECU. Don't know how many different kinds they used.
There are a few different crank wheel and cam wheel configurations. The engine computer needs to match what the engine has.
Before I decided to be a professional babysitter, I was a licensed engineer. I'm very analytically minded. Few things are as frustrating as not understanding why. Few things are as satisfying as tracking down the wrench in the gears.
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The ignition switch burned out. It was sending voltage to the computer with the key "on", but "start" cut power to the system. Couldn't hear the relays clicking back off due to the cranking noise.
Thanks for the help. I'm off to grab another celebratory beer.
