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Home >> Oldsmobile >> 1987 >> Custom Cruiser V8-307 5.0L >> Repair and Diagnosis >> Powertrain Management >> Ignition System >> Distributor >> Distributor Vacuum Control >> Description and Operation >> Distributor Spark Vacuum Modulator Valve (DS-VMV)
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Distributor Spark Vacuum Modulator Valve (DS-VMV)


This valve limits distributor spark vacuum to a calibrated value until ported vacuum applied to the control port of the DS-VMV is greater than the calibration value. When ported vacuum is greater than the calibration value, the distributor spark vacuum is equal to the ported vacuum signal.



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