AU3 no start?

[Franco Cozzo]

Hey guys we've got an issue with an AU series 3 Falcon. When you go to start it you get spark on cylinder one but no spark on the rest, it turns over a few times then nothing.

The ECU and BCM have been swapped out to no success, checked earthing at both modules with no problem, replaced coil pack even changed engines but same problem.

Car has 920,000km on the clock.

Any ideas? I'm thinking smart shield issue.