Manuals through 2025 now available!
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LEMON is the spiritual successor to CHARM, I recommend you try it!
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Ignition System: Description and Operation
This system provides electronically controlled spark advance and eliminated the need for mechanical and vacuum advance controls in the
distributor,
Figs. 14 and 15. The Electronic Control Unit (ECU), uses many sensors so that it can fire the
spark plugs at the proper time. The ECU controls spark advance and
ignition coil dwell.