https://docs.emtronaustralia.com.au/engine-management/config/triggers/sync-position/index.htmlSync Position % Sync position refers to the point in which the ECU is identifying the Sync Edge location. This reference point can be critical as if there is any discrepancy to this position mechanically (wandering between the crank and cam trigger due to slack in cam belt/chain), it can cause crank/sync errors, engine cycle change, or even the firing order to change (especially in the case of non-missing crank trigger setup).Hugoen-us