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Home >> Nissan-Datsun >> 1980 >> 280ZX Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Spark Timing Control System >> Testing >> Vacuum Delay Valve

Vacuum Delay Valve

  1. Remove vacuum delay valve from engine. Blow air into valve from distributor side of valve. Air should pass through valve without resistance. If not, replace valve.
  2. Next, blow air through carburetor or throttle chamber side (white side on 280ZX and 810 models - brown side on all other models) of valve. Air should not pass through valve without resistance. If no resistance is encountered, replace valve.
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