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Did your ignitor happen to go out after getting unusually hot?
I don't think the engine bay temp at one particular moment does it, its just over time one or more of the discrete components fail.
Back in 199? when it failed, the engine just stopped. I bought a brand new one from Toyota... OUCH!! I took the old one and rebuilt it with a 1985 GM ignitor and wired it in to the Toy ignitor case. I still have the photo that Benjamin (Thank YOU Benjamin, you are an awesome dude!) on the Off-Road.com site posted!! As I remember that GM ignitor was about $6, and it took me about 1 hour to solder in the ignitor and resistor I bought at RadioShack. And it worked perfectly. I had it under my seat for a spare.
Gnarls.