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Trigger 1 only and Direct Spark


grisom

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Greetings!

Have found some trouble with starting Ls3 engine on a Xtreme model. After wiring all coils and injectors to corresponding drives on an ECU, found that Trigger 2 is not working due to bigger custom front cover where sync sensor is located. So I decided to start engine without sync signal. Injectors chose an option "multi point group", and ignition "direct spark". Help file says that that in a "direct spark" (8 cyl) there will be active only 1-4 ignition drives. When I crank engine, drives 5-8 where sending pulses as well to coils. But engine don't won't to operate correctly. Is there an option to make all ignition drives work in a wasted spark way?

 

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It is mil spec wired. So It is hard to rewire. Initially it was wired for sequential injection and ignition. I just want to know, If each ignition drive wired to its own coil - can it work in wasted spark way? For example ignition drive 1and 5 trigger simultaneous.

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No, the coils have to be wired in pairs for wasted spark.

the only other work around you could use is change the trigger mode to multitooth missing and set trigger 2 sync mode to none.  It will then still run fully sequential and direct spark without the cam sensor but it will only start approx 50% of start attempts.  If it doesn’t fire instantly you need to stop cranking and try again.

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