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1981
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Pickup J20, 4WD, Automatic Trans
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Spark Control Systems
Spark Control Systems
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Description
Notes
Spark Coolant Temperature Override System
Non-Linear Vacuum Regulator Valve
Operation
Spark Coolant Temperature Override Switch
Single-Function for Standard Cooling
Single-Function for Heavy-Duty Cooling
Non-Linear Vacuum Regulator Valve
Forward Delay Valve
Reverse Delay Valve
Thermal Vacuum Spark Control Valve
Vacuum Spark Control Delay Valve
Maintenance
Testing
Spark Coolant Temperature Override Switch
Single-Function For Standard Cooling (6 and 8 Cylinder)
Single-Function for Standard Cooling (4 Cylinder)
Single-Function for Heavy-Duty Cooling
Non-Linear Vacuum Regulator Valve
Forward Delay Valve
Reverse Delay Valve
Vacuum Spark Control Delay Valve