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Home >> GMC >> 2003 >> Sierra 2500 HD, 2D Pickup, 8.1 G, RWD, Standard >> Repair and Diagnosis >> Engine Performance >> Specifications >> Engine Controls - Service & Adjustment Specifications - 8.1L >> Ignition Systems >> Ignition Timing

Ignition Timing

All models are equipped with an electronic computer-controlled ignition system. Ignition timing is not adjustable.