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Home >> Ford >> 1981 >> Courier 2.3L Eng VIN 2, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Spark Timing Control System >> Testing >> Vacuum Delay Valve >> 2.0 Liter Engine
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2.0 Liter Engine

  1. Remove air cleaner. Disconnect vacuum line from distributor. Disconnect air by-pass valve line (California) or anti-afterburn valve (Federal) at intake manifold fitting. Install vacuum line removed from distributor to intake manifold fitting.
  2. Remove vacuum line from carburetor side of vacuum delay valve, plug line and attach vacuum gauge to vacuum delay valve. See Fig 1. Start engine and run at idle speed.
  3. Disconnect vacuum line from intake manifold fitting. Note time required for vacuum reading to drop to 11.8 in. Hg. This should take 4-6 seconds. If system does not respond as indicated, replace vacuum delay valve. Reconnect all vacuum lines.
Fig 1: Spark Timing Control System Test Connections (2.0 Liter Engine)
G09313842Courtesy of FORD MOTOR CO.
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