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Really? The U1610A just came out this month, its the 100/200 MHz version. The 20 or 40 MHz scopes may be what you are looking at, those are cheaper.

The analog electronics and the ADCs are poor on these things. You will always be wondering if the crap you are seeing is the scope or the signal. Car electrical systems are noisy, and poor test equipment will frustrate you fast. That doesn't mean you have to go buy a $2000 U1610A from Agilent...

lower the lifeboats...

Well code 14 is the IGf feedback signal. Since you messed with the ignition wiring that's where I would focus my effort.

Okay, that's puzzling. If you touch your scope probe to 12V does it flatline to 12V on the screen?

It looks to me like you have the scope ac coupled. It needs to be dc coupled to see a slow square wave which is what I was expecting to see here. I'm no expert on this system, but if a lean command is more dwell angle, then that would be more time spent with the solenoid drive signal at ground...

Most likely your TPS IDL switch is not set properly causing this http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?Section=FI&P=125 But you need to fix code 14 first, that is more serious.

I hope you find the time to write up your instrument mods. By the way, for making little custom PCB boards, just go to this guy http://dorkbotpdx.org/wiki/pcb_order Use whatever CAD you like to generate the gerber files, then have them professionally made for $5 per square inch for three...

Since the CSI only operates during cranking, it cannot affect warmup (unless maybe it was leaking, in which it would affect normal temp running as well)

You should start with the one thing designed to help hot starts, the FPU VSV and associated hoses. http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=FI&P=116

Be careful with the universal CSI switch. The CSI temp rating is critical. Here's a Toyota TSB for the Supra in which a cold start issue was addressed with a new CSI design and part number. http://www.toyotapart.com/7M-G%28T%29E_ECU_COLD_START_INJECTOR_TIME_SWITCH_MODIFICATION_T-EG024-90.pdf

Well, dwell angle is (historically) the angle over which the point are closed (coil charging). For a 4 cylinder engine, there are 4 firings per revolution of the distributor, so the max dwell angle would be 90deg (360/4). Typically it would be ~45deg which is half the available max dwell...

Ox sensor at 0.3V is indicating lean mixture, and solenoid at 80% is indicating a command to go lean. Either your not measuring the duty cycle right, or the feedback loop is busted. I'd start by testing that ox sensor on the bench with a propane torch. Given the numbers it should not be...

Building electronic systems with the reliability and environmental requirements expected of automotive applications has never been cheap. The Environmental specs are typically identical to military systems, and the cost of the development of the custom firmware in an ECU is enormous. These are...

Speed signal is used for many ECU calculations, including idle, trailing throttle fuel cut, and mixture control. You may not notice any gross effects of no speed signal, but there are plenty of subtle ones.

Cam is partially blocked, but you can still see enough of it.

V = ir

We are still plugging away at this. Various software modules are coming together. This time of year tends to be tough, due to work and family activities that eat up too much time. Stay tuned...

If your CPS or wiring are bad to the ECU, you will get a code 12 after 2 or more seconds of cranking, and besides you won't get any spark at all. To double check, pull out the CPS, and with the ignition on spin the CPS shaft by hand. You should see a nice stream of sparks. I know you replaced...

The ignition switch, the electrical part that is, can be changed without touching the key cylinder or needing to re-key anything.