eclipse RS 98 don't spark wont start

hi, this is my first post, and i speak a little english, i have a big problem with my eclipse RS 98 420a, I changed the head gasket because of a bad oil leak, and then car running for one week, and all is normal very normal, but one day in the morning, i turn on my car and past 5 minutes this shutdown but in the night turn on normally again. But next day turn off again and only start for 2 seconds and turn off, today wont start one second simply wont start, i checked the car and not have spark. In the coil when turn ignition key are 12 volts for 1 second and after is ground (in the wire of the middle for the coil connector), I change 2 ecu's, crank sensor and cam sensor , and i checked wiring harness and its everything ok!, my mechanic tell me probably is ground from any relay or something but he can't fix this problem he search but dont find nothing, please help me! I read very pages but i don't read answer for this similar cases. Could you please give me some light on this very dark situation.

thank you very much FRANKNW!
(sorry for my english i wait you stand me)

Have your ASD (automatic shut down) relay checked out. It's the middle one of the three relays that are to the right of the brake fluid canister. When the relay is bad, you won't get spark. If yours turns out to be bad, I'm pretty sure I have a new one laying around somewhere.

Have your ASD (automatic shut down) relay checked out. It's the middle one of the three relays that are to the right of the brake fluid canister. When the relay is bad, you won't get spark. If yours turns out to be bad, I'm pretty sure I have a new one laying around somewhere.

I checked these relays but only are 2 relays, I checked the wires and volt is perfect the relays work fine! but anyway i will change relays, I read in internet that possibly the ECU or engine block need ground tomorrow try this.
thank you for your help.

Do you have an extra ecu that you can swap in? The ecu itself might be shot, happened to me once. Or maybe you have a buddy with the same car that you can pull his and try it on your car and see if it runs. Then you'll know if it's the ecu or not.

today my mechanic start my car for 1 second only :( he put to crank sensor a ground bridget, and he have the diagrams for ECU and tomorrow check my eclipse everyday i hope find the problem.

I tell you what happened with my car!

hi , i have the same problem on my 95 eclipse , car start cold and after 5 minutes shut down , after 5 minutes olly have spark in 2 cylinders , one of the wire from the computer to the coil stop pulsing but the other one doesn't , thats why spark in 2 cylinders


PLEASE HELLLLPPPP!!!!

Like Thompson said just try the ECU by testing a buddys ecu in your car.