Cold Start Spark Advance System: Testing
- To test both CSSA PVS and Coolant PVS, connect a vacuum gauge to port "D" and an unrestricted vacuum source to port "2". See Fig 1. With engine cold, no vacuum should be indicated. Warm engine to normal operating temperature and vacuum should be indicated at CSSA PVS with engine at normal idle.
- To further check coolant PVS, connect a "T" fitting and vacuum gauge in hose "D" with all other hoses connected. Gauge should not exceed 2 in. Hg vacuum at normal idle. In an artificially overheated engine (above 235°F), gauge should read full manifold vacuum. If above conditions are not met, replace defective valve(s).NOTE: See also Ford Motor Co. Spark Delay Valves in this section.