Testing and Inspection: Distributor Vacuum Delay Valve (DVDV)
Vacuum Spark Delay Valve: Testing and Inspection
Distributor Vacuum Modulator Valve (DVMV)
OPERATION
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When manifold or ported vacuum is less than 8.7 inches, the DVMV switches to full manifold vacuum.
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When manifold or ported vacuum is greater than 8.7 inches Hg, the DVMV switches to the higher of the two.