Hello, I have a 73 240z with a 280z block & head, w/ 83 turbo pieces installed. 83 dizzy, 83 turbo ecu, 83 wiring harness. Has proper fuses and relays to control the ECU, fuel pump, and all the solenoids and sensors in the bay. The injectors fire and the fuel pump primes and runs while cranking. There is still no spark. Wire is ran from pin 5 of the ecu straight to the igniter transistor. The coil has power and sparks when cheating the negative to ground but I can't get spark when cheating the igniter. There is nothing hooked up to the speed sensor, neutral switch, temp sender, but it should still spark. I figure if something was keeping the ECU from firing the spark, the injector wouldn't fire either. Its pointing at the ECU or igniter still. The HEI igniter mod was also tried and no spark. Ecu?

 

Is the ignitor / coil bracket grounded? Ignitor grounds through the bracket... won't spark otherwise. Other than that, I suspect the ecu... I also have a spare turbo ecu that will power the injectors, but no spark... swap ecu's and fires right up.

 

Yeah it's grounded. That's good to know, everything else has been checked numerous times the only thing left is the ecu. I have a new / used one on the way.