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Home >> Mercury >> 1977 >> Capri II Ghia, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Spark Delay Valve System >> Testing >> Spark Delay Valve >> Single Delay System
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Single Delay System

  1. Set vacuum test gauge to 10 in. Hg. Connect Black side of spark delay valve to vacuum source. Connect a 24" section of vacuum hose to gauge and to colored side of delay valve. Apply vacuum and observe time in seconds for gauge to reach 8 in. Hg with a 10 in. Hg vacuum source.
  2. To inspect delay valve for excessive restriction, minimum and maximum time for valve to reach 8 in. Hg should be as specified. See SDV COLOR CODE/SPECIFICATIONS  table. If valve fails tests, it should be replaced.
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