Vanagon F4-1915cc 1.9L (Water Cooled) (1983)
Distributor Advance Unit: Testing and Inspection
Vacuum Advance Unit, Checking For Leakage
Vacuum advance unit, checking for leaks
Work sequence
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Connect vacuum tester VAG 1368 or equivalent according to manufacturer's instructions.
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Run engine at approx. 2500 RPM and check that vacuum at throttle valve housing is reaching vacuum unit.
If NO, vacuum connection on throttle valve housing may be blocked.
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Increase engine speed until vacuum tester indicates higher reading than 360 mbar (270mm Hg).
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Switch vacuum tester so it holds vacuum on side connected to vacuum unit.
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Turn engine OFF.
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Vacuum reading on tester must not drop more than 10% within 1 minute, otherwise vacuum unit or hose is defective.