LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Chevrolet >> 1990 >> Celebrity L4-151 2.5L >> Repair and Diagnosis >> Powertrain Management >> Tune-up and Engine Performance Checks >> Ignition Timing >> Adjustments
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

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.