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Home >> Nissan-Datsun >> 1976 >> 280Z Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Spark Timing Control System >> Testing >> Spark/Vacuum Delay Valve >> 1977-78 Models

1977-78 Models

  1. Remove spark delay valve from distributor vacuum line. Blow air through carburetor side of valve (Brown side), then blow air through distributor side of valve.
  2. Resistance should be greater when blowing air from distributor side of valve. If valve is clogged or if air flow in both directions is the same, replace valve.
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