Ignition Timing

Correct ignition timing and carburetor idle adjustment is important to maintain correct emission levels and for proper running of vehicle. See Tune-Up Decal in engine compartment for ignition and carburetor adjustment specifications  .

With engine at normal operating temperature and dwell angle set correctly, disconnect and plug vacuum lines. Connect timing light and tachometer to engine. Start engine and reduce idle speed to 600 RPM to be sure that centrifugal advance is not operating. Adjust ignition timing to specifications by rotating distributor. Accelerate engine to 2000 RPM and make sure that timing advances. Unplug and reconnect vacuum advance line and again accelerate engine to 2000 RPM. Advance should begin sooner and advance further than when accelerated with vacuum line disconnected. Connect distributor vacuum retard unit to intake manifold vacuum and make sure that timing is retarded.