Vanagon F4-1970cc 2.0L (1982)
Checking With Siemens 451 Tester or Equivalent
Vacuum retard angle, checking with SIEMENS 451 tester or equivalent
Work sequence
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connect tester according to manufacturer's instructions
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disconnect plugs from idle stabilizer and connect together
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check ignition timing and adjust if necessary
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pull both vacuum hoses off distributor vacuum unit and plug retard hose
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adjust idle speed to 900 rpm
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note indicated retard angle on tester
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add 5° to indicated retard angle
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compare with specifications in chart for retard end
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reconnect vacuum hoses and adjust idle speed to 850-950 rpm
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reconnect plugs to idle stabilizer
Checking With Timing Advance Tester
Vacuum retard angle, checking with timing advance tester
Work sequence
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connect tachometer and timing advance tester according to manufacturer's instructions
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disconnect plugs from idle stabilizer and connect together
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start engine and flash ignition timing mark and note
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pull vacuum retard hose off vacuum unit and plug hose
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adjust idle speed to 900 rpm
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flash timing mark again and bring mark back to original setting by turning knob on timing advance tester
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read off retard angle and compare with specifications in chart for retard end
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reconnect vacuum hose and adjust idle speed to 850-950 rpm
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reconnect plugs to idle stabilizer