Checking With Timing Advance Tester

Vacuum retard angle, checking with timing advance tester

Work sequence

- connect tachometer and timing advance tester according to manufacturer's instructions
- disconnect plugs from idle stabilizer and connect together
- start engine and flash ignition timing mark and note
- pull vacuum retard hose off vacuum unit and plug hose
- adjust idle speed to 900 rpm
- flash timing mark again and bring mark back to original setting by turning knob on timing advance tester
- read off retard angle and compare with specifications in chart for retard end
- reconnect vacuum hose and adjust idle speed to 850-950 rpm
- reconnect plugs to idle stabilizer