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1979 Models

  1. Remove air cleaner. Detach vacuum line from distributor. Disconnect air by-pass valve line (Calif, only) 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 spark delay valve, plug line and attach vacuum gauge to vacuum delay valve. Start and run engine at idle speed.
  3. Detach 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 spark delay valve. Reconnect vacuum lines to original positions.
    Fig 1: 1979 Spark Timing Control System Test Connections
    G09313248Courtesy of FORD MOTOR CO.
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