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Home >> Oldsmobile >> 1991 >> Calais L4-151 2.5L >> Repair and Diagnosis >> Powertrain Management >> Ignition System >> Ignition Timing >> Adjustments
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Ignition Timing: Adjustments



This engine uses a Direct Ignition System (DIS) or Distributorless Ignition to control engine timing advance/retard. The Electronic Control Module combined with Electronic Spark Timing (ECM/EST) controls the ignition timing. The ignition timing is preset by the manufacturer, and no provisions for adjustment are provided.