Ford Motor Co. Cold Start Spark Hold System: Testing
- With engine cold, connect vacuum gauge to distributor side of CSSH ported vacuum switch. No vacuum should be indicated with engine idling. With engine at normal operating temperature, vacuum should be the same as manifold vacuum.
- Remove vacuum restrictor and test for flow in both directions. If blocked, replace restrictor. Restrictors are color coded according to hole size as follows: Blue -.015", Red -.020", Orange -.024" and Yellow -.030".