Let's put it this way; if the blast was close enough to damage the heavy-guage wiring in the ignition system, then the blast was close enough to do more than sprinkle radiation.
EMPs damage electronics by creating electric current in the pathways(induction). The EMP is strong enough that the pathways are overloaded. Again, this only happens inside the chips of the computers.
Old cars do not have any sensitive micro-electronics to be damaged by an EMP, it's just the starter, a distributor, and a mechanically-driven carburetor. [/quote]
It doesn't need micro-electronics or anything like that. An EMP blast would devastate 90% of all electrical systems, including the electrical system in cars. I went to college and minored in nuclear physics. Trust me, I know this shit like the back of my fucking hand.[/quote]
Technically speaking, 85%.