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Chevy Truck
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1999
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Express 1 Ton Van V8-454 7.4L VIN J SFI
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Repair and Diagnosis
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Powertrain Management
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Testing and Inspection
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Scan Tool Testing and Procedures
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Scan Tool Data, Normal Values and Definitions
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Scan Tool Data Definitions - Powertrain Systems
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Knock Retard
Knock Retard
Range (0.0-90 degrees)
The
KS
Retard indicates the amount of spark advance the
VCM
is removing in order to control spark knock.