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Home >> Nissan-Datsun >> 1981 >> 310 Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Spark Timing Control System >> Testing >> Vacuum Delay Valve
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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 of valve. Air should not pass through valve without resistance. If no resistance is encountered, replace vacuum delay valve.
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