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Home >> Mercury >> 1977 >> Capri II Base, 2.8L Eng, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Spark Delay Valve System >> Testing >> Spark Delay Valve >> Dual Delay System
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Dual Delay System

  1. Use an external vacuum source of 10 in. Hg. Connect a 24" section of vacuum hose to gauge and to distributor port of delay valve. Connect Black side of delay valve and "CARB" port of delay valve to vacuum source.
  2. Clamp vacuum hose from "CARB" port and apply 10 in. Hg to Black side of delay valve. Gauge should read 8 in. Hg in time specified. See SDV COLOR CODE/SPECIFICATIONS  table.
  3. Clamp distributor port, unclamp "CARB" port and apply vacuum of 10 in. Hg to "CARB" port. Gauge should read 8 in. Hg in time specified. See SDV COLOR CODE/SPECIFICATIONS  table. If valve fails tests, it should be replaced.
SDV COLOR CODE/SPECIFICATIONS

Valve Color Seconds (Min.) Seconds (Max.)
White & Brown 2 5
White & Green 9 20
Black & Grey 1 4
Black & Brown 2 5
Black & White 4 12
Black & Yellow 5.8 14
Black & Blue 7 16
Black & Green 9 20
Black & Orange 13 24
Black & Red 15 28