cranks but no spark at coil

4spdragtop said

Ok ECU hooked up, key on, ground -ve coil at battery -ve, and coil tower wire, gives me NADA.
Exact same test with ECU unhooked and I get spark with coil -ve wire to -ve battery BUT again nothing at coil tower wire.
Im thinking ECU is toast. What do you think?
ECU is approx 3 years old and visually looks good.
Is there another test to verify its pooched?

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You lost me here steve

Hook everything up "normal."

1..Turn key to "run"
2..Measure voltage coil NEG to ground
3..Measure voltage coil POS to ground
4..Disconnect distributor connector, and tap the bare end of the engine harness side of that connector to ground. Should make 1 "snap" spark each time. IF THIS HAPPENS it is likely the distributor or that connector