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[Abiton]

You've tried new plugs, right?

If not, could be tracking down the outside of plugs 1 & 4.

[cnc-dude]

The spark plugs are new.

There are three wires to the dis module. I believe one is signal for syl 1&4, one for 2&3 and the last one is ground.

I think I'm missing a signal from the ecu. I've measured the signal from the ecu when the engine is running (on 2&3), but I was not able to recognise any problems with a voltmeter. must probably have an oscilloscope.

Is the crankshaft and camshaft sensors the only input sensors that controls the ecu's ignition output?

[Abiton]

Try tracing the two signal wires as they go along the cable tray that runs along the length of the engine.

We had a fault on ours that eventually turned out to be a wire-to wire short in this area.  Chafe between the CTS signal wire and injector wiring caused wire-to-wire short, and the CTS to die.  It's just possible you have the same thing going on but with a DISpack wire?

Worth a quick look maybe.