Ford Motor Co. Cold Start Spark Hold System: Testing

Remove air cleaner and spark delay valve (if equipped). Install a connector in place of spark delay valve. Install a "T" fitting and vacuum gauge in distributor vacuum hose.
With engine at normal operating temperature and transmission in Neutral, momentarily open throttle (1/2 open). Check vacuum gauge. Vacuum should quickly rise and fall as throttle is opened and closed.
If vacuum is evident, the CSSH system is operating properly. If no vacuum is evident, check vacuum lines, evaporative canister purge hose, CSSH PVS and carburetor vacuum port for plugging. Correct if necessary.