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Pontiac Workshop Service and Repair Manuals

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Distributor Spark Thermal Vacuum Switch (DS-TVS)|Page 2960 > < Tach Filter|Locations

Firebird V8-305 5.0L (1982)

  • Powertrain Management
  • Ignition System
  • Distributor Thermal Vacuum Switch <--> [Thermal Vacuum Valve, Vacuum/Dist. Advance]
  • Component Information
  • Description and Operation
  • Distributor Spark Thermal Vacuum Switch (DS-TVS)

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Distributor Thermal Vacuum Switch: Description and Operation
Distributor Spark Thermal Vacuum Switch (DS-TVS)

When engine coolant temperature is below the calibration temperature the switch allows no vacuum flow to the distributor.

When engine coolant temperature is above the calibration temperature, the DS-TVS allows ported vacuum to the distributor. 
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The ported vacuum signal is controlled by a distributor spark vacuum delay valve (DS-VDV) which maintains vacuum advance during rapid
throttle openings, thereby improving engine response during cold engine operation.

  • Powertrain Management
  • Ignition System
  • Distributor Thermal Vacuum Switch <--> [Thermal Vacuum Valve, Vacuum/Dist. Advance]
  • Component Information
  • Description and Operation
  • Distributor Spark Thermal Vacuum Switch (DS-TVS)

Distributor Spark Thermal Vacuum Switch (DS-TVS)|Page 2960 > < Tach Filter|Locations