Take the icm to an auto parts store and have them test it.
With your 93, you should be able to read the codes by shorting the aldl pins with a paperclip. Many codes don't light the check engine light. You could have an icm code or crank and/or cam sensor code. Or other codes.
Go to this link and download the 93 factory service manual. It has a whole section dedicated to driveability & emissions. It will have explanations of the codes and how to test.
http://www.mediafire.com/?40mfgeoe4ctti
For diagnosing your car, an obd 1 scan program for your pc is a must. Our member GaryDoug has made a great one for our 4th gen cars. It's called "scan9495" It will scan for codes and do sensor data info on your 93. Get at
http://www.mediafire.com/?0elo4c935uc5s
You will need the net framework 4 or newer on your computer for the program to work. There's a folder with this at the linked site.
Get the v-6 version. You will need a cable to hook car's aldl to usb port of pc based computer. Laptop or notebook is best, but desk top will work iN A PINCH. Get cable at
http://www.aldlcables.com
Get the 12 pin cable. Even though your car doesn't run, using scan9495 on sensor data while you crank engine will give you lots of data that might be useful in troubleshooting your problem.
Have you actually checked to see if spark was present on several cylinders?
Here are some more tools you will need for troubleshooting. Digital multimeter, spark tester, noid light or 2 lead test light, fuel pressure gauge.
Low fuel pressure or your fuel injectors not opening will keep you from running also. Some codes cut fuel injector pulse off.
Also, does your security light come on when you turn the key on? Then cycle off after a few seconds? If yes, this is normal. Vats security is working as it should. If security light stays on, then car won't run. From factory, security light on meant injectors don't open and starter action is blocked. However, because of age of car and many owners, the starter block part of vats might have been bypassed by previous owner.