[ss3011]

Thanks for the info John. Now we know that none of the trigger electronics in the Opti-Spark have anything to do with your no start condition. It is so hard to track down intermittent problems. Since you have spark it is a good bet that you have a connection or wiring problem. Usually ECU's either work or they don't. Have you tried disconnecting the main injector connector and reconnecting it ? Most all the terminals are crimp connectors. If you know which wires are the power leads, then when you have a no-start condition leave the power on and probe to see if indeed you have the 12v power to the injectors. The ECU provides the ground to pulse the injectors. If you don't have it set up for sequential , which I don't think you do, because the Opti-Spark trigger is not hooked up. Then your system fires 4 injectors at once. Everytime the ECU sees 4 pulses from the crank trigger it fires a set of 4 injectors, usually bank to bank. It doesn't know when, since it has no particular cylinder reference, just every 4 pulses. Your ignition works, so the ECU is getting the pulses. If the injectors aren't firing then check the simple things first, like the connector connections, 12V supply to the harness, etc. You will figure it out, that DFI system is very reliable.