Vanagon F4-1915cc 1.9L (Water Cooled) (1983)
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Center-punch plug in CO adjusting hole
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Drill 2.5 mm (3/32 in) hole in center of plug 3.5 - 4.0 mm (9/64-5/32 in) deep
CAUTION: Clean up any metal shavings
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Screw in 3 mm (1/8 in) sheet metal screw
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Remove plug with screw, using pliers
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Reinstall intake air sensor 2
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Start engine (oxygen sensor disconnected)
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Adjust CO to 0.7 ±0.4%
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Stop engine
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Drive in new plug flush with intake air sensor
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Reconnect electrical connection of oxygen sensor
Note: With oxygen sensor and idle stabilizer connected
CO must be: 0.3 ±1.1%
Idle speed: 850 - 950 rpm