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Home >> Chevy Truck >> 1999 >> Express 1 Ton Van V8-5.7L VIN R >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Scan Tool Testing and Procedures >> Scan Tool Data, Normal Values and Definitions >> Scan Tool Data Definitions - Powertrain Systems >> Spark Control

Spark Control

(Advance/Retard)
The Spark Control parameter indicates whether the VCM is advancing or retarding spark.

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