Chevrolet Workshop Service and Repair Manuals > C 2500 Truck 2WD V8-454 7.4L (1988) > Powertrain Management | Ignition System | Ignition Timing Connector | Component Information | Locations | Electronic Spark Timing Bypass | Page 4687

Knock Sensor > < Electronic Spark Timing Bypass|Page 4686

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The Spark Plug # 1 wire is the Ignition Timing Connector.

Powertrain Management
Ignition System
Ignition Timing Connector / Electronic Spark Timing Bypass
Page 4687

Knock Sensor > < Electronic Spark Timing Bypass|Page 4686