Oldsmobile Workshop Service and Repair Manuals > Ninety-Eight FWD V6-181 3.0L (1985) > Engine, Cooling and Exhaust | Engine | Tune-up and Engine Performance Checks | Distributor, Ignition | Distributor Vacuum Control | Component Information | Description and Operation | Distributor Spark Vacuum Modulator Valve (DS-VMV)

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Distributor Vacuum Control: Description and Operation
Distributor Thermal Control Valve (DTCV)

This valve is used in the manifold vacuum line to the distributor vacuum advance to improve driveability during cold engine operation.

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