System Operation Test
- 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.
- Remove vacuum line from carburetor side of spark delay valve, plug line and attach vacuum gauge to vacuum delay valve.
- Start engine and run at idle speed. Detach vacuum line from intake manifold fitting. Note time required for vacuum reading to drop to 11.8 in. (300 mm) Hg. This should take 4-6 seconds. If system does not respond as indicated, replace spark delay valve. Reconnect all vacuum lines.
Courtesy of FORD MOTOR CO.