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Home >> GMC >> 1999 >> Safari Van AWD V6-4.3L VIN W >> 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
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Spark

Range -96 to -255 Degrees
The Spark Advance is a display of the spark advance calculation which the VCM is provided to the Ignition Control Module. The VCM calculates the desired spark advance using data such as engine temperature, RPM, load and vehicle speed.
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