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Home >> Chevrolet >> 2003 >> Impala LS >> Repair and Diagnosis >> Engine Performance >> Engine Control System - On-Vehicle Adjustments >> Ignition Timing
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Ignition Timing

NOTE: All engines are equipped with either a C3 I, DIS or IDI ignition system. Timing on these systems is controlled by the Powertrain Control Module (PCM) and is not adjustable.