Vanagon F4-1915cc 1.9L (Water Cooled) (1983)
Auxiliary Air Valve (Idle Speed): Testing and Inspection
Auxiliary air regulator, checking
Note: When engine is cold, regulator is open fully, allowing additional air to engine.
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Engine cold
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Run engine at idle speed
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Pinch hose (arrow)
RPM must drop
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Run engine at idle speed for about 5 minutes more
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Repeat above test
RPM must not change
If RPM drops:
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Disconnect electrical plug from auxiliary air regulator
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Check voltage supply with engine running
If voltage is OK:
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Replace auxiliary air regulator