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Home >> Pontiac >> 1999 >> Sunfire L4-2.2L VIN 4 >> 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 >> Engine Scan Tool Data Definitions >> Spark
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Spark

Range - 64 to -64 degrees
This is a display of the spark advance (IC) calculation which the PCM is programming in the ignition system. It computes the desired spark advance using data such as engine temperature, RPM, engine load, vehicle speed and operating mode.
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