'90 runs cold then stalls no fuel, no spark

Can someone help me here please? My son's 90 escort 1.9L CFI starts up fine when cold and runs for almost exactly 10 minutes. Then it will stall and cannot be restarted until it sits for another few hours and cools back down. I watch the fuel injector when it stalls and it simply stops spraying gas. When I try to restart, it does not pulse any gas. WAIT, but THAT's NOT ALL... I put a spark tester on and NO spark either... from the coil or a plug. When I put gas directly in the carburetor, no firing. MY guess? something is telling the computer to stop running when it gets warm. (going closed loop??) My Chilton's book is a POC... very little help on this model.

I've been in the "buy another sensor and stick it in cause it's cheap" mode on other cars and would like to avoid it on this one. Are there things I can check or have you seen this problem before? Remember, the car will run fine when cold, so dead fuel pump, or lost timing is doubtful.

Thanks in advance.
G

If the problem was just no spark then I'd replace the coil but since you are losing your fuel supply too I would take a close look at the ignition switch.

Might try the junkyard if you're looking for cheap test parts to throw at it.

Either test the coil or replace it. Coils usually fail after the they get hot.

Previously, this car failed to start and I isolated the problem to the coil and replaced it (a year ago or so). When this latest problem happened, I did the prescribed test again. It says that there is supposed to be a resistance across the two posts (can't remember the value). I measured zero, so I replaced it again. But when I got the new one and tested it, it said zero too... either the test is wrong in the book, or the new one is bad-out-of-the-box. At any rate, I'm looking elsewhere because 1) the coil DOES fire when I start up, 2) it's new, 3) the car doesn't get fuel either. If you think that my logic if flawed and that I might indeed have a bad coil again, please comment. THANKS!!!! I'm floundering

I don't know anything about the '90 model but I had a look at the wiring diagram in the Repair Info section at Autozone (http://www.autozone.com). If the diagram is accurate for that year (sometimes they aren't) then the switched contacts of the EEC Power Relay supply 12V to the ECM on pins 37 & 57, and also feed 12V to the high end of the fuel injector (the red wire). Next time it quits and fails to restart, I'd check if that 12V was missing. There would appear to be three points at which you can check the voltage so just choose whichever is most accessible, and measure the voltage on the red wire at either the fuel injector, canister purge solenoid, or EGR vacuum regulator. And if the link works then this (http://www.autozone.com/autozone/repairinfo/repairguide/repaiguideOverlay.jsp?src=http://repairguide.autozone.com/znetrgs/repair_guide_content/en_us/images/0900c152/80/08/b6/c1/large/0900c1528008b6c1.&imageType=gif&imageName=Fig.%2026:%20Engine%20wiring-1989-90%20CFI-equipped%20models) is the relevant diagram.